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specifications are subject to change without notice. 257 i. product selection guide.............................................................258 ii. potentiometers multiturn..............................................................................260 single-turn..........................................................................265 knobpot ? .............................................................................270 pushbutton (digital readout) ..............................................272 iii. definitions & test procedures....................................................274 precision potentiometers www.bourns.com
specifications ar e subject to change without notice. 258 model element resistance resistance standar d pkg. pkg. shaft page no. t ur ns t ype t olerance range linearity dia. depth dia./length mount no. (ohms) 3400 10 wir ewound 3% 100-500k 0.15% 1-13/16 1-3/4 1/4 x 13/16 bushing 260 (30mm) (46mm) (6 x 21mm) 3500 10 wir ewound 3% 50-100k 0.20% 7/8 1 1/4 x 13/16 bushing 261 (22mm) (25mm) (6 x 21mm) 3540 10 wir ewound 5% 100-100k 0.25% 7/8 3/4 1/4 x 13/16 bushing 262 (22mm) (19mm) (6 x 21mm) 3541 10 hybritr on ? 10% 1k-100k 0.25% 7/8 3/4 1/4 x 13/16 bushing 262 (22mm) (19mm) (6 x 21mm) 3543 3 wir ewound 5% 20-50k 0.25% 7/8 3/4 1/4 x 13/16 bushing 263 (22mm) (19mm) (6 x 21mm) 3545 5 wir ewound 5% 50-50k 0.25% 7/8 3/4 1/4 x 13/16 bushing 263 (22mm) (19mm) (6 x 21mm) 3590 10 wir ewound 5% 200-100k 0.25% 7/8 3/4 v arious bushing 264 (22mm) (19mm) model element resistance resistance standar d pkg. pkg. shaft page no. t ype t olerance range linearity dia. depth dia./length mount no. (ohms) 6537 conductive 10% 1k-100k 1% 7/8 1/2 1/8 x 1/2 servo 265 plastic (22mm) (13mm) (3 x 12.7mm) 6538 conductive 10% 1k-100k 1% 7/8 19/32 1/8 x 1/2 servo 265 plastic (22mm) (15mm) (3 x 12.7mm) 6539 conductive 15% 1k-100k 2% 7/8 19/32 1/8 x 1/2 servo 268 plastic (22mm) (15mm) (3 x 12.7mm) 6574 conductive 10% 1k-100k 0.1% 2 19/32 1/4 x 7/8 servo 266 plastic (51mm) (15mm) (6 x 22mm) 6637 conductive 10% 1k-100k 1% 7/8 9/16 1/8 x 7/8 bushing 267 plastic (22mm) (14mm) (3 x 22mm) 6639 conductive 15% 1k-100k 2% 7/8 21/32 1/4 x 7/8 bushing 268 plastic (22mm) (17mm) (6 x 22mm) 6657 conductive 10% 1k-100k 1% 1-5/16 25/32 1/4 x 7/8 bushing 269 plastic (33mm) (20mm) (6 x 22mm) multitur n pr ecision potentiometers pr oduct selection guide single-t ur n pr ecision potentiometers
model element resistance resistance pkg. pkg. shaft page no. t ur ns t ype t olerance range accuracy dia. depth dia./length mount no. (ohms) see 3/4 see 3600 10 wir ewound 5% 100-100k data (19mm) data n/a bushing 270 sheet sheet see 7/8 see 3610 10 wir ewound 5% 100-100k data (22mm) data n/a snap-in 271 sheet sheet model element resistance resistance pkg. pkg. shaft page no. digits t ype t olerance range accuracy dia. depth dia./length mount no. (ohms) see see see 3682 2 cermet 3% 50-1 meg data data data n/a snap-in 272 sheet sheet sheet see see see 3683 3 cermet 3% 50-1 meg data data data n/a snap-in 272 sheet sheet sheet specifications ar e subject to change without notice. 259 knobpot ? pr ecision potentiometers pr oduct selection guide digital pushbutton potentiometers
specifications ar e subject to change without notice. 260 3400 - pr ecision potentiometer featur es n bushing mount n optional 0.05 linearity option n excellent wiper stability n high stop str ength n sealable electrical characteristics 1 standar d resistance range ................................................................. 100 to 500k ohms resistance t olerance .................................................................................................. 3% independent linearity ............................................................................................ 0.15% resolution ......................................................................... see r ecommeded part number ef fective electrical angle ............................................................................. 3600 +4 , -0 absolute minimum resistance ............. 1 ohm or 0.15% maximum (whichever is gr eater) noise ........................................................................................ 100 ohms enr maximum power rating (v oltage limited by power dissipation, or ............................ (40 c) 5 watts 1,000 v ac, whichever is less) ................................................................. (125 c) 0 watt dielectric withstanding v oltage .............................................. mil-std-202, method 301 sea level ......................................................................................... 1,000 v ac minimum 80,000 feet ........................................................................................ 300 v ac minimum insulation resistance (500 vdc) .............................................. 1,000 megohms minimum envir onmental characteristics 1 operating t emperatur e static operation t emperatur e range .................................................... -65 c to +125 c dynamic t emperatur e range ................................................................. +1 c to +125 c t emperatur e coef ficient2 ........................................................ 20ppm/ c maximum/unit moistur e resistance ........................................... mil-std-202, method 103, condition b t otal resistance shift .............................................................................. 2% maximum v ibration ....................................................................................................................... 10g wiper bounce ......................................................................... 0.1 millisecond maximum t otal resistance shift .............................................................................. 2% maximum v oltage ratio shift ................................................................................ 0.1% maximum shock ........................................................................................................................... 50g wiper bounce ......................................................................... 0.1 millisecond maximum t otal resistance shift .............................................................................. 2% maximum v oltage ratio shift ................................................................................ 0.1% maximum load life ............................................................................................ 1,000 hours, 5 watts t otal resistance shift .............................................................................. 2% maximum rotational life (no load) ....................................................... 2,000,000 shaft r evolutions 2 t otal resistance shift .............................................................................. 5% maximum mechanical characteristics 1 mechanical angle ........................................................................................ 3600 +4 , -0 shaft runout ................................................................................ 0.002 in. (0.05mm) t .i.r. shaft end play ............................................................................. 0.005 in. (0.13mm) t .i.r. shaft radial play ....................................................................... 0.0025 in. (0.06mm) t .i.r. pilot diameter runout ................................................................. 0.002 in. (0.05mm) t .i.r. lateral runout ............................................................................. 0.005 in. (0.13mm) t .i.r. stop str ength ................................................................... 550 oz.-in. (388 ncm) minimum t or que (starting & running) .............................................. 2.0 oz.-in. (1.4 ncm) maximum backlash ...................................................................................................... 1.0 maximum w eight ................................................................................................ appr oximately 110g t erminals ....................................................................................... gold-plated solder lugs markings .................................... manufactur er s name and part number , r esistance value and tolerance, linearity tolerance, wiring diagram, date code ganging .................................................................................................. 2 cups maximum wiper 1-13/16 (46.04) dia. 29.37 (1-5/32) 3/8"-32 2a thd unef ccw cw 45?x .25 chamfer 10.32 + .00/ - .05 (.4062 + .000/ -.002) pilot dia. 7.94 5/16 20.64 (13/16) 1.52 (.06) 39.4 add (1.55) for additional cup 4.76 (3/16) typ. 2.36 (.093) dia. typ. 6.34 + .00/ - .01 (. 2497 + .0000/ - .0003) shaft dia. 3.18 (.125) 14.3 (9/16) 1.02 (.04) note: lockwasher and hex nut to be supplied with each unit. 1 3 cw clockwise ccw 2 wiper 6.35 (1/4) wide slot x 1.02 (.04) deep extends 1.02 (.04) past mounting surface 44.45 ?.79 (1-3/4 ?1/32) tolerances: except where noted .25 .13 decimals: .xx ? (.010), .xxx (.005) fractions: ?/64 mm dimensions: ( in.) dia. anti-rotation pin 1 at r oom ambient: +25 c nominal and 50% r elative humidity nominal, except as noted. 2 consult manufactur er for complete specification details for r esistances below 500 ohms and above 100k ohms. par t number resistance resolution 3400s-1-102 1,000 .020 3400s-1-502 5,000 .013 3400s-1-103 10,000 .010 recommended part numbers bold-f ace listings are in stock and readil y a v ailable through distribution. for other options consul t f actor y .
specifications ar e subject to change without notice. 261 3500 - pr ecision potentiometer . 2 5 ( . 0 1 0 ) x 4 5 c h a m f e r w i p e r 3 / 8 " - 3 2 2 a t h d u n e f c c w 1 2 . 7 ( 1 / 2 ) 8 . 0 . 3 8 ( . 3 1 5 . 0 1 5 ) n o t e : l o c k w a s h e r a n d h e x n u t t o b e s u p p l i e d w i t h e a c h u n i t . n o t e : s h a f t l e n g t h v a r i a t i o n s 3 5 0 0 s - 1 - r c 3 5 0 0 s - 2 - r c 3 5 0 1 h - 1 - r c c w 3 5 0 0 s - 2 / 3 5 0 1 h - 1 5 . 4 6 . 7 6 ( . 2 1 5 . 0 3 0 ) 1 . 5 2 ( . 0 6 ) 2 5 . 4 . 5 1 ( 1 . 0 0 . 0 2 ) 1 0 . 3 2 + . 0 0 / - . 0 5 ( . 4 0 6 2 + . 0 0 0 / - . 0 0 2 ) p i l o t d i a . . 6 . 3 4 + . 0 0 / - . 0 1 ( . 2 4 9 + . 0 0 0 0 / - . 0 0 0 3 ) r e f . 2 0 . 6 4 . 7 9 ( 1 3 / 1 6 1 / 3 2 ) d i a . 2 2 . 2 3 ( 7 / 8 ) a d j u s t m e n t s l o t l o c a t i o n o f o p t i o n a l a / r p i n o n r 4 5 5 8 . 9 ( . 3 5 ) 4 5 5 1 6 . 0 ( . 6 3 ) r m a x . t o l e r a n c e s : e x c e p t w h e r e n o t e d . 2 5 . 1 3 d e c i m a l s : . x x ( . 0 1 0 ) , . x x x ( . 0 0 5 ) f r a c t i o n s : 1 / 6 4 m m d i m e n s i o n s : ( i n . ) 1 3 c w c l o c k w i s e c c w 2 w i p e r w i d e x . 8 1 ( . 0 3 2 ) d e e p . 8 1 . 2 5 ( . 0 3 2 . 0 1 0 ) 1 1 / 1 6 ( 1 7 . 4 6 ) 1 3 / 1 6 ( 2 0 . 6 4 ) 1 3 / 1 6 ( 2 0 . 6 4 ) . 2 9 ( 7 . 3 7 ) 1 at r oom ambient: +25 c nominal and 50% r elative humidity nominal, except as noted. 2 consult manufactur er for complete specification details for r esistances below 500 ohms. featur es n bushing mount n sealable n non-standar d featur es and specifications available n optional high tor que featur e n optional center tap featur e n gangable electrical characteristics 1 standar d resistance range ................................... 50 to 200k ohms resistance t olerance ....................... 3% independent linearity ................. 0.20% resolution ........... see r ecommeded part numbers ef fective electrical angle ..................................... 3600 +10 , -0 absolute minimum resistance/minimum v oltage ..................... 1 ohm or 0.1% maximum (whichever is gr eater) noise .............. 100 ohms enr maximum power rating (v oltage limited by power dissipation or 325 v ac, whichever is less) +70 c ........................................ 2 watts +125 c ........................................ 0 watt dielectric withstanding v oltage mil-std-202, method 301 sea level .............. 1,500 v ac minimum 70,000 feet ............. 400 v ac minimum insulation resistance (500 vdc) .... 1,000 megohms minimum e nvir onmental characteristics 1 operating t emperatur e static operation t emp range ................................... -65 c to +125 c dynamic t emp range ..................................... +1 c to +125 c t emperatur e coef ficient 2 ................... 50ppm/ c maximum/unit v ibration ............................................ 20g wiper bounce ..................... 0.1 millisecond maximum t otal resistance shift ... 2% maximum v oltage ratio shift ..... 0.1% maximum shock .............................................. 100g wiper bounce ..................... 0.1 millisecond maximum t otal resistance shift ... 2% maximum v oltage ratio shift ..... 0.1% maximum load life ................. 1,000 hours, 2 watts t otal resistance shift ... 2% maximum rotational life (no load) .................. 2,000,000 shaft r evolutions 2 t otal resistance shift ... 5% maximum moistur e resistance ......... mil-std-202, method 103,condition b t otal resistance shift ... 2% maximum par t number resistance resolution 3500s-2-102 1,000 .030 3500s-2-502 5,000 .018 3500s-2-103 10,000 .019 recommended part numbers mechanical characteristics 1 mechanical angle ........... 3600 +10 , -0 shaft runout ....................... 0.002 in. (0.05mm) t .i.r. lateral runout ....................... 0.005 in. (0.13mm) t .i.r. pilot diameter runout ....................... 0.002 in. (0.05mm) t .i.r. shaft end play ....................... 0.005 in. (0.13mm) t .i.r. shaft radial play ....................... 0.003 in. (0.08mm) t .i.r. stop str ength ..................... 96 oz.-in. (67.8 ncm) min. t or que (starting & running) ................... 0.6 oz.-in. (0.42 ncm) max. backlash ........................... 1.0 maximum w eight ....................... appr oximately 28g t erminals ............ gold-plated solder lugs ganging ....................... 2 cups maximum bold-f ace listings are in stock and readil y a v ailable through distribution. for other options consul t f actor y .
specifications ar e subject to change without notice. 262 3540/3541 - pr ecision potentiometer 3540 3541 wir ewound element hybritr on ? element electrical characteristics 1 standar d resistance range .......... 100 to 100k ohms .................. 1k to 100k ohms resistance t olerance ...................... 5% ...................................... 10% independent linearity .................... 0.25% .................................. 0.25% resolution ...................................... see r ecommended par t numbers essentially infinite ef fective electrical angle ................ 3600 +10 , -0 ...................... 3600 +10 , -0 absolute minimum resistance/ ...... 1 ohm or 0.1% maximum ...... minimum voltage minimum v oltage (whichever is gr eater) 0.2% maximum noise .............................................. 100 ohms enr maximum ...... output smoothness 0.1% maximum power rating (v oltage limited by power dissipation or 447 v ac, whichever is less) +70 c .......................................... 2 watts .................................. 2 watts +125 c ........................................ 0 watt .................................... 0 watt dielectric withstanding v oltage ...... mil-std-202, method 301 .... mil-std-202, method 301 sea level .................................... 1,000 v ac minimum .............. 1,000 v ac minimum insulation resistance (500 vdc) .................................... 1,000 megohms minimum .... 1,000 megohms minimum envir onmental characteristics 1 operating t emperatur e static operation t emp range ...... -55 c to +125 c .................... -55 c to +125 c dynamic t emp range .................. +1 c to +125 c ...................... +1 c to +125 c t emperatur e coef ficient 2 .............. 50ppm/ c maximum/unit .... 100ppm/ c maximum/unit v ibration .......................................... 15g ........................................ 15g wiper bounce .............................. 0.1 millisecond maximum ...... 0.1 millisecond maximum shock .............................................. 50g ........................................ 50g wiper bounce .............................. 0.1 millisecond maximum ...... 0.1 millisecond maximum load life ........................................ 1,000 hours, 2 watts .............. 1,000 hours, 2 watts t otal resistance shift .................. 2% ...................................... 5% rotational life (no load) ................ 1,000,000 shaft r evolutions 2 .. 5,000,000 shaft r evolutions 2 t otal resistance shift .................. 5% maximum ...................... 5% maximum moistur e resistance ...................... mil-std-202, method 103, .. mil-std-202, method 103, condition b condition b t otal resistance shift .................. 2% maximum ...................... 5% maximum mechanical characteristics 1 mechanical angle .......................... 3600 +10 , -0 ...................... 3600 +10 , -2 shaft runout .................................. 0.003 in. (0.08mm) t .i.r. ........ 0.003 in. (0.08mm) t .i.r. lateral runout ................................ 0.005 in. (0.13mm) t .i.r. ........ 0.005 in. (0.13mm) t .i.r. pilot diameter runout .................... 0.003 in. (0.08mm) t .i.r. ........ 0.003 in. (0.08mm) t .i.r. shaft end play ................................ 0.012 in. (0.30mm) t .i.r. ........ 0.012 (0.30mm) t .i.r. shaft radial play ............................ 0.003 in. (0.08mm) t .i.r. ........ 0.003 (0.08mm) t .i.r. stop str ength ................................ 75 oz-in. (53 ncm) minimum .. 75 oz.-in. (53 ncm) minimum t or que (starting & running) ............ 0.6 oz.-in. (0.35 ncm) max. .. 0.6 oz.-in. (0.35 ncm) max. backlash ........................................ 1.0 maximum ........................ 1.0 maximum w eight ............................................ appr oximately 21g ................ appr oximately 22.5g t erminals ........................................ gold-plated solder lugs ........ gold-plated solder lugs ganging .......................................... 2 cups maximum .................... 2 cups maximum 3540s-1/3541h-1 1 5.72 ?.38 (.225?015) 10.32 +.00/.05 (.406+.000/-.002) 3/8" 32-unef-2athd adjustment slot .81 wide x . 81?25 deep 2 3 1.52 (.06) 7.92 ?.38 (.312 ?.015) 19.05 ?.38 (.750 ?.015) 30 ?5 6.35 (.25) 22.23 ?.38 (.875 ?.015) mtg. face 12.45 (.49) optional antirotation lug (-91) 1.42 x .50 on 7.4 radius. length 1.27 from mounting surface. (suggested panel hole 1.6 dia.) 1 3 cw clockwise ccw 2 wiper 18.3 (.72) 14.35 ?.38 (.565 ?015) dia. (.032) (.032?010) 6.342 + .000/ - .008 (.2497+.0000/-.0003) dia. 20.62 ?.79 (.812 ?.031) 15.88 (.625) dia. min. 15.88 (.625) tolerances: except where noted .25 .13 decimals: .xx (.010), .xxx (.005) fractions: ?/64 mm dimensions: (in.) .25 (.010) x 45?chamfer r max. 1 at r oom ambient: +25 c nominal and 50% r elative humidity nominal, except as noted. 2 consult manufactur er for complete specification details. featur es n bushing mount n optional center tap and r ear shaft extension n optional ar lug featur e n gangable with common or concentric shafts n high tor que available n optional 0.1% linearity n non-standar d featur es and specifications available par t number resistance resolution 3540s-1-201 200 .042 3540s-1-501 500 .031 3540s-1-102 1,000 .027 3540s-1-202 2,000 .021 3540s-1-502 5,000 .021 3540s-1-103 10,000 .019 3540s-1-203 2,000 .014 recommended part numbers par t number resistance resolution 3540s-1-103 10,000 .019 3540s-1-203 20,000 .014 3540s-1-503 50,000 .011 3540s-1-104 100,000 .008 3541h-1-102 1,000 .027 3541h-1-502 5,000 .021 3541h-1-103 10,000 .019 bold-f ace listings are in stock and readil y a v ailable through distribution. for other options consul t f actor y .
specifications ar e subject to change without notice. 263 3543/3545 - pr ecision potentiometer 3543 3545 3-t ur n 5-t ur n electrical characteristics 1 standar d resistance range .......... 20 to 50k ohms ...................... 50 to 50k ohms resistance t olerance ...................... 5% ...................................... 5% independent linearity .................... 0.25% .................................. 0.25% resolution ...................................... see r ecommended par t numbers see r ecommended par t numbers ef fective electrical angle ................ 1080 +10 , -0 ...................... 1800 +10 , -0 absolute minimum resistance/ ...... 1 ohm or 0.1% maximum ...... 1 ohm or 0.1% maximum minimum v oltage (whichever is gr eater) (whichever is gr eater) noise .............................................. 100 ohms enr maximum ...... 100 ohms enr maximum power rating (v oltage limited by power dissipation or 224 v ac [3543] or 273 v ac [3545], whichever is less) +70 c .......................................... 1 watt .................................... 1.5 watt +125 c ........................................ 0 watt .................................... 0 watt dielectric withstanding v oltage ...... mil-std-202, method 301 .... mil-std-202, method 301 sea level .................................... 1,000 v ac minimum .............. 1,000 v ac minimum insulation resistance (500 vdc) .................................... 1,000 megohms minimum .... 1,000 megohms minimum envir onmental characteristics 1 operating t emperatur e static operation t emp range ...... -55 c to +125 c .................... -55 c to +125 c dynamic t emp range .................. +1 c to +125 c ...................... +1 c to +125 c t emperatur e coef ficient 2 .............. 50ppm/ c maximum/unit .... 50ppm/ c maximum/unit v ibration .......................................... 15g ........................................ 15g wiper bounce .............................. 0.1 millisecond maximum ...... 0.1 millisecond maximum shock .............................................. 50g ........................................ 50g wiper bounce .............................. 0.1 millisecond maximum ...... 0.1 millisecond maximum load life ........................................ 1,000 hours, 1 watt ................ 1,000 hours, 1.5 watts t otal resistance shift .................. 2% maximum ...................... 2% maximum rotational life (no load) ................ 300,000 shaft r evolutions ...... 500,000 shaft r evolutions t otal resistance shift .................. 5% maximum ...................... 5% maximum moistur e resistance ...................... mil-std-202, method 103, .. mil-std-202, method 103, condition b condition b t otal resistance shift .................. 2% maximum ...................... 2% maximum mechanical characteristics 1 mechanical angle .......................... 1080 +10 , -0 ...................... 1800 +10 , -0 shaft runout .................................. 0.003 in. (0.08mm) t .i.r. ........ 0.003 in. (0.08mm) t .i.r. lateral runout ................................ 0.005 in. (0.13mm) t .i.r. ........ 0.005 in. (0.13mm) t .i.r. pilot diameter runout .................... 0.003 in. (0.08mm) t .i.r. ........ 0.003 in. (0.08mm) t .i.r. shaft end play ................................ 0.010 in. (0.25mm) t .i.r. ........ 0.010 in. (0.25mm) t .i.r. shaft radial play ............................ 0.003 in. (0.08mm) t .i.r. ........ 0.003 in. (0.08mm) t .i.r. stop str ength ................................ 75 oz.-in. (53 ncm) min. ........ 75 oz.-in. (53 ncm) min. t or que (starting & running) ............ 0.5 oz.-in. (0.35 ncm) max. .. 0.5 oz.-in. (0.35 ncm) max. w eight ............................................ appr oximately 21g ................ appr oximately 21g t erminals ........................................ gold-plated solder lugs ........ gold-plated solder lugs backlash ........................................ 1.0 maximum ........................ 1.0 maximum ganging .......................................... 2 cups maximum .................... 2 cups maximum 3543s-1/3545s-1 1 18.3 (.72) 5.72 ?.38 (.225 ?.015) 10.31+ .00/ - .05 (.406+.000/-.002) 3/8" 32-unef-2athd adjustment slot wide x .81?25 deep 2 3 1.52 (.06) 7.92 ?.38 (.312 ?.015) 19.05 ?.38 (.750 ?.015) 20.62 ?.79 (.812 ?.031) 30 ?5 6.35 (.25) 22.23 ?.38 (.875 ?.015) mtg. face 15.88 dia. min. 12.45 (.49) 1 3 cw clockwise ccw 2 wiper 14.35 ?.38 (.565 ?.015) dia. (.032?0160 ) .81 (.032) 6.342 + .000/ - .008 (. 2497+.0000/-.0003) dia. optional antirotation lug (-91) 1.42 x .50 on 7.4 radius length 1.27 from mounting surface. (suggested panel hole 1.6 dia.) (.056 x .02) (.29) (.063) (.625) tolerances: except where noted .25 .13 decimals: .xx (.010), .xxx (.005) fractions: ?/64 mm dimensions: (in.) note: lockwasher and mounting nuts supplied. add .75 (19mm) for additional cups. .25 (.010) x 45?chamfer 15.88 (.625) r max. 1 at r oom ambient: +25 c nominal and 50% r elative humidity nominal, except as noted. 2 consult manufactur er for complete specification details. featur es n bushing mount n optional ar pin featur e n non-standar d featur es and specifications available n gangable recommended part numbers par t number* resistance resolution ( w ) (%) 3543s-1-102 1,000 .063 3543s-1-202 2,000 .062 3543s-1-502 5,000 .047 3543s-1-103 10,000 .040 par t number resistance resolution ( w ) (%) 3545s-1-102 1,000 .043 3545s-1-202 2,000 .036 3545s-1-502 5,000 .038 3545s-1-103 10,000 .027 bold-f ace listings are in stock and readil y a v ailable through distribution. for other options consul t f actor y .
specifications ar e subject to change without notice. 264 3590 - pr ecision potentiometer electrical characteristics 1 standar d resistance range ................................................................. 200 to 100k ohms resistance t olerance .................................................................................................. 5% independent linearity ............................................................................................ 0.25% resolution ...................................................................... see r ecommended part numbers ef fective electrical angle ........................................................................... 3600 +10 , -0 absolute minimum resistance ............... 1 ohm or 0.1% maximum (whichever is gr eater) noise ......................................................................................... 100 ohms enr maximum power rating (v oltage limited by power dissipation or 450 v ac, whichever is less) +40 c ................................................................................................................... 2 watts +125 c ................................................................................................................... 0 watt dielectric withstanding v oltage .............................................. mil-std-202, method 301 sea level ......................................................................................... 2,000 v ac minimum insulation resistance (500 vdc) .............................................. 1,000 megohms minimum envir onmental characteristics 1 operating t emperatur e static operation t emperatur e range .................................................... -55 c to +125 c dynamic operation t emperatur e range ................................................ +1 c to +125 c t emperatur e coef ficient 2 ......................................................... 50ppm/ c maximum/unit v ibration ....................................................................................................................... 15g wiper bounce ......................................................................... 0.1 millisecond maximum shock ........................................................................................................................... 50g wiper bounce ......................................................................... 0.1 millisecond maximum load life ............................................................................................ 1,000 hours, 2 watts t otal resistance shift .............................................................................. 2% maximum rotational life (no load) ........................................................ 1,000,000 shaft r evolutions t otal resistance shift .............................................................................. 5% maximum moistur e resistance ........................................... mil-std-202, method 103, condition b t otal resistance shift .............................................................................. 2% maximum mechanical characteristics 1 mechanical angle ...................................................................................... 3600 +10 , -0 shaft runout ................................................................................ 0.005 in. (0.13mm) t .i.r. lateral runout ............................................................................. 0.008 in. (0.20mm) t .i.r. pilot diameter runout ................................................................. 0.003 in. (0.08mm) t .i.r. shaft end play ............................................................................. 0.010 in. (0.25mm) t .i.r. shaft radial play ......................................................................... 0.005 in. (0.13mm) t .i.r. stop str ength ....................................................................... 64 oz.-in. (45 ncm) minimum t or que (starting & running) ........................... 0.5 oz.-in. (0.40 ncm) maximum (unsealed) 1.5 oz.-in. (1.1 ncm) maximum (sealed) mounting t or que ....................................................... 5-7 in.-lbs. (0.55 - 0.80 nm) (plastic) 15-18 in.-lbs. (1.7 - 2 nm) (metal) backlash ...................................................................................................... 1.0 maximum t erminals ........................................................................................ solder lugs or pc pins w eight .................................................................................................. appr oximately 19g 2 1 3 bushing diameter (see part numbers) shaft diameter (see part numbers) 1 3 ccw cw cw 2 standoffs 12.70 (.500) mounting surface 15.54 (.612) recommended pc board mounting hole locations fms 5.08 ?.38 (.200 ?.015) 6.99 ?.38 (.275 ?.015) 5.08 ?.38 (.200 ?.015) 10.31 + .00/- .13 (.406+.000/-.005) .25 (.010) 1.19 (.047) .81 ?.25 (.032 ?.010) (metal versions) 7.92 (.312) .81 (.032) 20.62 ?.81 (.812 ?.032) 18.6 ?.4 (.732 ?.015) 12.2 (.48) 11.81 (.465) dia. 22 ?.38 (.875 ?015) dia. hole diameter 2.08 (.082) 5.08 (.200) 5.08 (.200) 6.99 (.275) tolerances: except where noted .51 .13 decimals: .xx (.02), .xxx ? (.005) fractions: ?/64 mm dimensions: (in.) (plastic versions) r note: for anti-rotation pin add 91 after configuration dash number . example: -2 becomes -291 to add ar pin. 1 at r oom ambient: +25 c nominal and 50% r elative humidity nominal, except as noted. 2 consult manufactur er for complete specification details for r esistance below 1k ohms. shaft & bushing configura tions (bushing - dxl, shaft - d) (-1) plastic bushing (3/8 x 5/16) and shaft (.2480 + .001, - .002) (-2) metal bushing (3/8 x 5/16) and shaft (.2497 + .0000, - .0009) (-3) sealed, plastic bushing (3/8 x 5/16) and shaft (.2480 + .001, - .002) (-4) sealed, metal bushing (3/8 x 5/16) and shaft (.2497 + .0000, - .0009) (-5) metric, plastic bushing (9mm x 7.94mm) and shaft (6mm + 0, - .076mm) (-6) metric, metal bushing (9mm x 7.94mm) and shaft (6mm + 0, - .023mm) (-7) metric, sealed, plastic bushing (9mm x 7.94mm) and shaft (6mm + 0, - .076mm) (-8) metric, sealed, metal bushing (9mm x 7.94mm) and shaft (6mm + 0, - .023mm) featur es n bushing mount n optional ar pin featur e n plastic or metal shaft and bushings n w ir ewound n solder lugs or pc pins n sealable (full body seal) n non-standar d featur es and specifications available recommended part numbers resistance resolution (printed cir cuit) (solder lug) ( w ) (%) 3590p-1-102 3590s-2-102 1,000 .029 3590p-1-202 3590s-2-202 2,000 .023 3590p-1-502 3590S-2-502 5,000 .025 3590p-1-103 3590s-2-103 10,000 .020 3590p-1-203 3590s-2-203 20,000 .016 3590p-1-503 3590s-2-503 50,000 .013 3590p-1-104 3590s-2-104 100,000 .009 bold-f ace listings are in stock and readil y a v ailable through distribution. for other options consul t f actor y .
6537/6538 - 22mm pr ecision potentiometer 6 5 3 7 1 3 c w c l o c k w i s e c c w 2 w i p e r 6 5 3 8 b a l l b e a r i n g 3 0 1 0 x 1 2 . 7 0 . 8 0 ( . 3 7 5 . 0 3 1 ) 1 2 . 7 0 . 3 8 ( . 5 0 0 . 0 1 5 ) 1 . 5 7 ( . 0 6 2 ) 1 . 5 7 ( . 0 6 2 ) 1 . 5 7 ( . 0 6 2 ) 3 . 1 7 0 + . 0 0 0 / - . 0 0 8 ( . 1 2 4 8 + . 0 0 0 0 / - . 0 0 0 3 ) d i a . . 5 1 ( . 0 2 0 ) c h a m f e r 2 2 . 2 3 ( . 8 7 5 ) d i a . 3 . 1 8 ( . 1 2 5 ) . 5 1 ( . 0 2 0 ) r e f . 1 9 . 0 5 0 + . 0 0 0 / - . 0 1 2 ( . 7 5 + . 0 0 0 0 / - . 0 0 0 5 ) d i a . 1 9 . 8 1 ( . 7 8 0 ) d i a . 3 0 3 t y p . . 1 9 ( 4 . 8 0 ) r 4 5 5 r 5 . 0 8 ( . 0 2 0 ) t o l e r a n c e s : e x c e p t w h e r e n o t e d . 2 5 . 1 3 d e c i m a l s : . x x ( . 0 1 0 ) , . x x x ( . 0 0 5 ) f r a c t i o n s : 1 / 6 4 m m d i m e n s i o n s : ( i n . ) 1 2 . 7 0 . 3 8 ( . 4 7 5 . 0 1 5 ) 1 2 . 7 0 . 3 8 ( . 5 0 0 . 0 3 1 ) 1 . 5 7 ( . 0 6 2 ) 1 . 5 7 ( . 0 6 2 ) 1 . 5 7 ( . 0 6 2 ) 4 5 1 5 x . 2 5 ( . 0 1 0 ) c h a m f e r 2 2 . 2 3 ( . 8 7 5 ) d i a . 3 . 1 8 ( . 1 2 5 ) . 5 1 ( . 0 2 0 ) r e f . 1 9 . 8 1 ( . 7 8 0 ) d i a . 1 9 . 0 5 0 + . 0 0 0 / - . 0 1 2 ( . 7 5 + . 0 0 0 0 / - . 0 0 0 5 ) d i a . 1 at r oom ambient: +25 c nominal and 50% r elative humidity nominal, except as noted. featur es n infinite r esolution element n standar d linearity: 1.0% n extended temperatur e range:-65 c to +125 c n extended life version (6538) n output smoothness: 0.1% standar d n molded-in r ear ter minals n non-standar d featur es and specifications available specifications ar e subject to change without notice. 265 electrical characteristics 1 6537 6538 standar d resistance range .......... 1k to 100k ohms ................... 1k to 100k ohms resistance t olerance .................... 10% ...................................... 10% independent linearity .................... 1% ........................................ 1% resolution ..................................... essentially infinite ................... essentially infinite ef fective electrical angle ............... 340 +3 ................................. 340 +3 end v oltage ................................... 0.5% max ............................... 0.5% max output smoothness ...................... 0.1% ....................................... 0.1% power rating (v oltage limited by power dissipation or 300 v ac, whichever is less) +70 c .......................................... 1 watt ..................................... 1 watt +125 c ........................................ 0 watt ..................................... 0 watt dielectric withstanding v oltage ................................................. mil-std-202, method 301 ......... mil-std-202, method 301 sea level .................................... 750 v ac min. .......................... 750 v ac min. insulation resistance (500 vdc) .................................... 500 megohms min. ................ 1,000 megohms min. envir onmental characteristics 1 operating t emperatur e static operation t emp range ..... -65 c to +125 c .................... -65 c to +125 c dynamic t emp range ................. +1 c to +125 c ...................... +1 c to +125 c t emperatur e coef ficient ............... 500ppm/ c max ................... 500ppm/ c max moistur e resistance ............................ mil-std-202, method 106 ......... mil-std-202, method 106 t otal resistance shift .................. 10% max .............................. 10% max v ibration ......................................... 15g ........................................ 15g wiper bounce ............................. 0.1 millisecond max ............... 0.1 millisecond max t otal resistance shift .................. 5% max ................................ 5% max v oltage ratio shift ....................... 0.5% max ............................. 0.5% max shock ............................................. 50g ........................................ 50g wiper bounce ............................. 0.1 millisecond max ............... 0.1 millisecond max t otal resistance shift .................. 5% max ................................ 5% max v oltage ratio shift ....................... 0.5% max ............................. 0.5% max load life ........................................ 1,000 hours, 1 watt ................ 1,000 hours, 1 watt t otal resistance shift .................. 10% max .............................. 10% max rotational life (no load) ............... 10,000,000 shaft r ev s ............ 20,000,000 shaft r ev s t otal resistance shift .................. 10% max .............................. 10% max mechanical characteristics 1 mechanical angle .......................... continuous ............................. continuous backlash ........................................ 0.1 max ................................. 0.1 max shaft runout .................................. 0.005 in. (0.13mm) t .i.r. ................. 0.001 in. (0.025mm) t .i.r. shaft end play ............................... 0.005 in. (0.13mm) t .i.r. ........ 0.005 in. (0.13mm) t .i.r. shaft radial play ........................... 0.005 (0.13mm) t .i.r. ............. 0.003 in. (0.08mm) t .i.r. pilot diameter runout ........................................... 0.0025 in. (0.06mm) t .i.r. ......... 0.0025 in. (0.06mm) t .i.r. lateral runout ............................. 0.003 in. (0.08mm) t .i.r. ........ 0.003 in. (0.08mm) t .i.r. t or que (starting & running) ........... 0.5 oz.-in. (0.40 ncm) max. ... 0.25 oz.-in. (0.18 ncm) max. t erminals ........................................ molded-in r ear ........................ molded-in r ear recommended part numbers part number resistance ( w ) 6537s-1-103 10,000 part number resistance ( w ) 6538s-1-102 1,000 6538s-1-202 2,000 6538s-1-502 5,000 6538s-1-103 10,000 bold-f ace listings are in stock and readil y a v ailable through distribution. for other options consul t f actor y .
specifications ar e subject to change without notice. 266 6574 - pr ecision potentiometer electrical characteristics 1 standar d resistance range ................................................................... 1k to 100k ohms resistance t olerance ................................................................................................ 10% independent linearity ............................................................................................ 0.25% ef fective electrical angle ...................................................................................... 350 2 minimum v oltage .......................... 0.1% maximum (0.2% at 2k ohms, 0.4% at 1k ohms) resolution ............................................................................................. essentially infinite power rating (v oltage limited by power dissipation or 350 v ac, whichever is less) +70 c .................................................................................................................. 2 watts +125 c ................................................................................................................... 0 watt output smoothness ................................................................................................... 0.1% dielectric withstanding v oltage .............................................. mil-std-202, method 301 sea level ......................................................................................... 1,000 v ac minimum 70,000 feet ........................................................................................ 350 v ac minimum insulation resistance (500 vdc) .............................................. 1,000 megohms minimum envir onmental characteristics 1 operating t emperatur e static operation t emperatur e range .................................................... -65 c to +125 c dynamic operation t emperatur e range ................................................ +1 c to +125 c t emperatur e coef ficient 2 .............................................................. 500ppm/ c maximum moistur e resistance ........................................... mil-std-202, method 103, condition b t otal resistance shift ............................................................................ 10% maximum v ibration ....................................................................................................................... 15g wiper bounce ......................................................................... 0.1 millisecond maximum t otal resistance shift .............................................................................. 2% maximum shock ........................................................................................................................... 60g wiper bounce ......................................................................... 0.1 millisecond maximum rotational life (no load) ...................................................... 25,000,000 shaft r evolutions t otal resistance shift ............................................................................ 10% maximum load life ......................................................................................... 1,000 hours, 1.5 watts t otal resistance shift ............................................................................ 10% maximum mechanical characteristics 1 shaft runout .............................................................................. 0.001 in. (0.025mm) t .i.r. shaft end play ............................................................................. 0.003 in. (0.08mm) t .i.r. shaft radial play ......................................................................... 0.003 in. (0.08mm) t .i.r. pilot diameter runout ............................................................... 0.001 in. (0.025mm) t .i.r. lateral runout ............................................................................. 0.003 in. (0.08mm) t .i.r. backlash ...................................................................................................... 0.1 maximum mechanical angle ............................................................................................. continuous t or que (starting & running) .......................................... 0.75 oz.-in. (0.53 ncm) maximum chamfer 1 2 3 90?max. 15 ?3 15 ?3 1 3 cw clockwise ccw 2 wiper min. 6.35 (.25) dia. 6.34 + .000/- .007 (.2497+.0000/-.0003) 47.63 +.000/ - .025 (1.875+.000/-.001) dia. 51.0 +.127/- .25 (2.00 +.005/-.010) 1.57 (.062) 2.36 (.093) 2.03 (.080) min. 15.24 ?.787 (.600 ?.031) 15.9 ?.80 (5/8 ?1/32) 29.59 (1.165) tolerances: except where noted .38 .13 decimals: .xx (.015), .xxx (.005) fractions: ?/64 mm dimensions: (in.) .25 (.010) x 45 max. 1 at r oom ambient: +25 c nominal and 50% r elative humidity nominal, except as noted. featur es n ser vo mount style n shaft suppor ted by fr ont and r ear pr eci - sion ball bearings n non-standar d featur es and specifications available n gangable up to 10 cups par t number* resistance (w) 6574s-1-102 1,000 6574s-1-502 5,000 6574s-1-103 10,000 recommended part numbers bold-f ace listings are in stock and readil y a v ailable through distribution. for other options consul t f actor y .
specifications ar e subject to change without notice. 267 6637 - pr ecision potentiometer b o u r n s 3 1 2 30 3 typ. cw 3/8-32 unef-thd 22.23 ?.79 (7/8 ?1/32) 45?x (.010) chamfer note: shaft supported by front sleeve bearing. 6637 7/8" (22mm) dia. 4.83 (.19) r 1.57 (.062) 11.25 ?.38 (.443 ?.015) 22.23 (7/8) dia. 10.317 + .000/- .051 (.4062+.000/-.002) dia. dia. 3.170 + .000/-.008 (.1248+.0000/-.0003) .25 9.53 ?.79 (3/8 ?1/32) shaft slot (.032) wide x (.032) deep .81 .81 3.18 (1/8) 1 at r oom ambient: +25 c nominal and 50% r elative humidity nominal, except as noted. electrical characteristics 1 standar d resistance range .................... .................................. 1k to 100k ohms resistance t olerance ..................... 10% independent linearity ...................... 1% ef fective electrical angle ........... 340 +3 end v oltage .................... 0.5% maximum output smoothness ....... 0.1% maximum resolution ................... essentially infinite power rating (v oltage limited by power dissipation or 300 v ac, whichever is less) +70 c .......................................... 1 watt +125 c ........................................ 0 watt dielectric withstanding v oltage ................... mil-std-202, method 301 sea level ................. 750 v ac minimum insulation resistance (500 vdc) .... 1,000 megohms minimum envir onmental characteristics 1 operating t emperatur e static operation t emp range ................................... -65 c to +125 c dynamic t emp range ..................................... +1 c to +125 c t emperatur e coef ficient ......................... 500ppm/ c maximum moistur e resistance ................... mil-std-202, method 106 t otal resistance shift .................................... 10% maximum v ibration ............................................ 15g wiper bounce ..................... 0.1 millisecond maximum t otal resistance shift ... 5% maximum v oltage ratio shift ..... 0.5% maximum shock ................................................ 50g wiper bounce ..................... 0.1 millisecond maximum t otal resistance shift ... 5% maximum v oltage ratio shift ..... 0.5% maximum rotational life (no load) ................. 10,000,000 shaft r evolutions t otal resistance shift .................................... 10% maximum load life ................... 1,000 hours, 1 watt t otal resistance shift . 10% maximum 1 3 cw clockwise ccw 2 wiper featur es n bushing mount n excellent r esolution n high r otational life n non-standar d featur es and specifications available mechanical characteristics 1 mechanical angle .................. continuous backlash ........................... 0.1o maximum shaft runout ..................... 0.001 in. (0.025mm) t .i.r. shaft end play ....................... 0.005 in. (0.13mm) t .i.r. shaft radial play ....................... 0.005 in. (0.13mm) t .i.r. t or que (starting & running) ................... 0.5 oz.-in. (0.40 ncm) max. par t numbers resistance (w) 6637s-1-102 1,000 6637s-1-502 5,000 6637s-1-103 10,000 recommended part numbers bold-f ace listings are in stock and readil y a v ailable through distribution. for other options consul t f actor y .
specifications ar e subject to change without notice. 268 6539/6639 - pr ecision potentiometer b o u r n s 3 1 2 30 3 typ. cw 65/6639 6539 6639 3/8" - 32 unef 1 3 cw clockwise ccw 2 wiper 12.70 .38 (.500 .015) 3.170 +.000/-.008 (.1248+.0000/-.0003) dia. shaft 30 10 x (.020) chamfer .51 1.57 (.062) 1.57 (.062) 1.57 (.062) 19.050+ 000/-.012 (.750+.0000/-.0005) 19.81 (.780) dia. .51 (.020) ref 12.70 .79 (.500 .031) 3.18 (.125) 22.23 (.875) dia. 11.25 .38 (.443 .015) 1.57 (.062) 22.23 (.875) dia. 6.342+.000/-.008 (.2497+.0000/-.0003) dia. shaft 30 10 (.020) chamfer .51 slot (.047) x (.063) 1.19 1.60 10.317+.000/-.051 (.4062+.000/-.002) dia. 3.18 (.125) .51 (.020) ref 9.53 .79 (.375 .031) 22.23 .76 (.875 .03) r 4.83 (.182) tolerances: except where noted .38 .13 decimals: .xx (.015) .xxx (.005) fractions: 1/64 mm dimensions: (in.) 1 at r oom ambient: +25 c nominal and 50% r elative humidity nominal, except as noted. featur es n essentially infinite r esolution n excellent r otational life n high quality , r ugged constr uction n general purpose applications n non-standar d featur es available n cost and space saving part numbers resistance bushing mount mechanical stops ( w ) 6639s-1-102 6639s-301-102 1,000 6639s-1-202 2,000 6639s-1-502 6639s-301-502 5,000 6639s-1-103 6639s-301-103 10,000 6639s-1-203 20,000 recommended part numbers bold-f ace listings are in stock and readil y a v ailable through distribution. for other options consul t f actor y . 6539 6639 servo mount bushing mount electrical characteristics 1 standar d resistance range ............ 1k to 100k ohms .................... 1k to 100k ohms resistance t olerance standar d ...................................... 15% ...................................... 15% independent linearity standar d ...................................... 2.0% .................................... 2.0% resolution ...................................... essentially infinite .................. essentially infinite ef fective electrical angle ................ 340 +3 .................................. 340 +3 end v oltage .................................... 0.5% maximum ...................... 0.5% maximum output smoothness ........................ 0.1% ...................................... 0.1% power rating (v oltage limited by power dissipation or 300 v ac, whichever is less) +70 c ............................................ 1.0 watt .................................. 1.0 watt +125 c .......................................... 0 watt ...................................... 0 watt dielectric withstanding v oltage ...... mil-std-202, method 301 .... mil-std-202, method 301 sea level ...................................... 750 v ac minimum .................. 750 v ac minimum insulation resistance (500 vdc) ...................................... 500 megohms minimum ........ 500 megohms minimum envir onmental characteristics 1 operating t emperatur e static operation t emp range ...... -65 c to +125 c .................... -65 c to +125 c dynamic t emp range .................. +1 c to +125 c ...................... +1 c to +125 c v ibration .......................................... 15g ........................................ 15g wiper bounce .............................. 0.1 millisecond maximum ...... 0.1 millisecond maximum shock .............................................. 50g ........................................ 50g wiper bounce .............................. 0.1 millisecond maximum ...... 0.1 millisecond maximum rotational life (no load) ................ 10,000,000 shaft .................... 10,000,000 shaft r evolutions r evolutions t otal resistance shift ...................... 10% maximum ..................... 10% maximum mechanical characteristics 1 mechanical angle ............................ continuous, stops .................. continuous, stops (340 +8 , -0 ) available (340o +8o -0o) available backlash .......................................... 0.1o maximum ........................ 0.1o maximum shaft runout .................................. 0.005 in. (0.13mm) t .i.r. ........ 0.005 in. (0.13mm) t .i.r. shaft end play ................................ 0.005 in. (0.13mm) t .i.r. ........ 0.005 in. (0.13mm) t .i.r. shaft radial play ............................ 0.005 in. (0.13mm) t .i.r. ........ 0.005 in. (0.13mm) t .i.r. pilot diameter runout .......................................... 0.0025 in. (0.06mm) t .i.r. lateral runout .............................. 0.003 in. (0.08mm) t .i.r. t or que (starting & running) ............ 0.5 oz.-in. (0.40 ncm) max. .. 0.5 oz.-in. (0.40 ncm) max. t erminals ........................................ rear t urr et t ype ...................... rear t urr et t ype bearing t ype .................................... brass sleeve .......................... nickel plated brass markings .......................................... manufactur er s name, ............ manufactur er s name, part number , r esistance part number , r esistance value and tolerance, value and tolerance, linearity tolerance, linearity tolerance, wiring diagram and wiring diagram and date code. date code. par t number resistance ( w ) 6539s-1-102 1,000 6539s-1-502 5,000 6539s-1-103 10,000
specifications ar e subject to change without notice. 269 6657 - pr ecision potentiometer electrical characteristics 1 standar d resistance range ................................................................... 1k to 100k ohms resistance t olerance ................................................................................................ 10% independent linearity ................................................................................................. 1% resolution ............................................................................................. essentially infinite ef fective electrical angle ...................................................................................... 340 3 end v oltage ............................................................................................... 0.5% maximum output smoothness ................................................................................................... 0.1% power rating (v oltage limited by power dissipation or 300 v ac, whichever is less) +70 c ............................................................................................................... 1.5 watts +125 c ................................................................................................................... 0 watt dielectric withstanding v oltage .............................................. mil-std-202, method 301 sea level ............................................................................................ 750 v ac minimum insulation resistance (500 vdc) .............................................. 1,000 megohms minimum envir onmental characteristics 1 operating t emperatur e static operation t emperatur e range .................................................... -65 c to +125 c dynamic operation t emperatur e range ................................................ +1 c to +125 c t emperatur e coef ficient ................................................................ 500ppm/ c maximum v ibration ....................................................................................................................... 15g wiper bounce ......................................................................... 0.1 millisecond maximum t otal resistance shift .............................................................................. 5% maximum v oltage ratio shift ................................................................................ 0.5% maximum shock ........................................................................................................................... 50g wiper bounce ......................................................................... 0.1 millisecond maximum t otal resistance shift .............................................................................. 5% maximum v oltage ratio shift ................................................................................ 0.5% maximum load life ......................................................................................... 1,000 hours, 1.5 watts t otal resistance shift ............................................................................ 10% maximum rotational life (no load) ...................................................... 10,000,000 shaft r evolutions t otal resistance shift ............................................................................ 10% maximum moistur e resistance ................................................................ mil-std-202, method 106 t otal resistance shift ............................................................................ 15% maximum mechanical characteristics 1 mechanical angle ............................................................................................. continuous backlash ...................................................................................................... 0.1 maximum shaft runout .............................................................................. 0.001 in. (0.025mm) t .i.r. shaft end play ............................................................................. 0.005 in. (0.13mm) t .i.r. shaft radial play ......................................................................... 0.005 in. (0.13mm) t .i.r. t or que (starting & running) ............................................ 0.5 oz.-in. (0.40 ncm) maximum b o u r n s 3 1 2 30 3 typ. cw clockwise 3/8"-32 unef-2athd 45?x (.010) chamfer shaft slot 1 3 cw ccw 2 wiper 1.57 (.062) 16.46 ?.38 (.648 ?.015) 33.34 (1-5/16) dia. 10.317+.000/-.051 (.4062+.000/-.002) dia. shaft 6.345 +.000/-.008 (.2498 +.0000/-.0003) dia. shaft .25 wide 1.19 (.047) x deep 1.60 (.063) r 6.35 (.25) tolerances: except where noted .25 .13 decimals: .xx (.010), .xxx (.005) fractions: ?/64 mm dimensions: (in.) 9.53 ?.79 (3/8?1/32) 22.23 ?.79 (7/8 ?1/32) 3.18 (1/8) 1 at r oom ambient: +25 c nominal and 50% r elative humidity nominal, except as noted. featur es n bushing mount n shaft suppor ted by fr ont sleeve bearing n non-standar d featur es and specifications available part number* resistance ( w ) 6657s-1-102 1,000 6657s-1-202 2,000 6657s-1-502 5,000 6657s-1-103 10,000 recommended part numbers bold-f ace listings are in stock and readil y a v ailable through distribution. for other options consul t f actor y .
specifications ar e subject to change without notice. 270 3600 - pr ecision potentiometer electrical characteristics 1 standar d resistance range ................................................................. 100 to 100k ohms resistance t olerance .................................................................................................. 5% accuracy (corr elation of dial readout to v oltage ratio output) ........ 0.5% voltage ratio repeatability of dial readout ............................................................. 0.1% voltage ratio resolution ..................................................................... see r ecommended part numbers ef fective electrical angle ............................................................................. 3600 nominal absolute minimum resistance ............... 1 ohm or 0.1% maximum (whichever is gr eater) noise ......................................................................................... 100 ohms enr maximum power rating (v oltage limited by power dissipation or 385 v ac, whichever is less) +25 c ............................................................................................................... 1.5 watts +85 c ..................................................................................................................... 0 watt dielectric withstanding v oltage .............................................. mil-std-202, method 301 sea level ......................................................................................... 1,000 v ac minimum 70,000 feet ........................................................................................ 400 v ac minimum insulation resistance (500 vdc) .............................................. 1,000 megohms minimum envir onmental characteristics 1 operating t emperatur e static operation t emperatur e range ...................................................... -65 c to +85 c dynamic operation t emperatur e range .................................................. +1 c to +85 c t emperatur e coef ficient 2 ......................................................... 50ppm/ c maximum/unit moistur e resistance ........................................... mil-std-202, method 103, condition b t otal resistance shift .............................................................................. 2% maximum v ibration ....................................................................................................................... 10g wiper bounce ......................................................................... 0.1 millisecond maximum t otal resistance shift .............................................................................. 2% maximum v oltage ratio shift ................................................................................ 0.2% maximum shock ........................................................................................................................... 50g wiper bounce ......................................................................... 0.1 millisecond maximum t otal resistance shift .............................................................................. 2% maximum v oltage ratio shift ................................................................................ 0.2% maximum load life ......................................................................................... 1,000 hours, 1.5 watts t otal resistance shift .............................................................................. 2% maximum rotational life (no load) 2 ......................................................... 200,000 shaft r evolutions t otal resistance shift .............................................................................. 2% maximum mechanical characteristics 1 mechanical angle ...................................................................................... 3600 +20 , -0 stop str ength ....................................................................... 20 oz.-in. (14 ncm) minimum t or que (starting & running) .............................................. 4.0 oz.-in. (2.8 ncm) maximum v ariation ........................................................................ 1.0 oz.-in. (0.71 ncm) maximum backlash ...................................................................................................... 1.0 maximum w eight .................................................................................................. appr oximately 17g t erminals ........................................................................................... gold-plated j-hooks markings ........... manufactur er s name and part number , r esistance value and date code 0 5 4 3 2 1 9 8 7 6 k n o b p o t 1 2 3 19.10 (3/4) non-turn pin extends 1.70 ?.13 (. 067 ?.005) pilot dia. 10.26 ?.05 (.404 ?.002) 3/8"-32unef-2athd non-turn pin extends 1.70 ?.13 (.067 ?.005) panel hole pattern lockwasher and mounting nut to be supplied with each unit 1 3 cw clockwise ccw 2 wiper dia. 25.40 ?.80 (1.00 ?.03) 8.73 (11/32) 19.10 (3/4) dia. (.156) max. - (.060) min. panel thickness 3.96 1.52 #21 awg gold plated grade a nickel solder lugs (.0285) located on .05 radius .724 3.18 ?.79 (1/8 ?/32) 1.40 ?.38 (.055 ?.015) i.d. 4.76 ?.79 (3/16 ?1/32) dia. 1.98 + .08/ - .03 (.078 +.003/-.001) 7.11 (.280) 10.41 ?.08 (.410 ?.003) tolerances: except where noted .25 .13 decimals: .xx (.010), .xxx (.005) fractions: ?/64 mm dimensions: (in.) dia. 1 at r oom ambient: +25 c nominal and 50% r elative humidity nominal, except as noted. 2 consult manufactur er for complete specification details for r esistances below 100 ohms. featur es n bushing mount n cost saving; pr e-phased n highly r eadable clockface r eadout n easy mounting par t number resistance resolution ( w ) (%) 3600s-1-102 1,000 .035 3600s-1-502 5,000 .027 3600s-1-103 10,000 .022 recommended part numbers bold-f ace listings are in stock and readil y a v ailable through distribution. for other options consul t f actor y .
specifications ar e subject to change without notice. 271 3610 - pr ecision potentiometer electrical characteristics 1 standar d resistance range ................................................................. 100 to 100k ohms resistance t olerance .................................................................................................. 5% accuracy (corr elation of dial readout to v oltage ratio output) ........ 0.5% voltage ratio repeatability of dial readout ............................................................. 0.1% voltage ratio resolution ..................................................................... see r ecommended part numbers ef fective electrical angle ............................................................................. 3600 nominal absolute minimum resistance ............... 1 ohm or 0.1% maximum (whichever is gr eater) noise ......................................................................................... 100 ohms enr maximum power rating (v oltage limited by power dissipation or 385 v ac, whichever is less) +25 c ............................................................................................................... 1.5 watts +85 c ..................................................................................................................... 0 watt dielectric withstanding v oltage .............................................. mil-std-202, method 301 sea level ......................................................................................... 1,000 v ac minimum 70,000 feet ........................................................................................ 400 v ac minimum insulation resistance (500 vdc) .............................................. 1,000 megohms minimum envir onmental characteristics 1 operating t emperatur e static operation t emperatur e range ...................................................... -25 c to +85 c dynamic operation t emperatur e range .................................................. +1 c to +85 c t emperatur e coef ficient 2 ........................................................ 50ppm/ c maximum/wir e moistur e resistance ........................................... mil-std-202, method 103, condition b t otal resistance shift .............................................................................. 2% maximum v ibration ....................................................................................................................... 10g wiper bounce ......................................................................... 0.1 millisecond maximum t otal resistance shift .............................................................................. 2% maximum v oltage ratio shift ................................................................................ 0.2% maximum shock ........................................................................................................................... 50g wiper bounce ......................................................................... 0.1 millisecond maximum t otal resistance shift .............................................................................. 2% maximum v oltage ratio shift ................................................................................ 0.2% maximum load life ......................................................................................... 1,000 hours, 1.5 watts t otal resistance shift .............................................................................. 2% maximum rotational life (no load) ............................................................ 50,000 shaft r evolutions t otal resistance shift .............................................................................. 2% maximum mechanical characteristics 1 mechanical angle ...................................................................................... 3600 +20 , -0 stop str ength ....................................................................... 20 oz.-in. (14 ncm) minimum t or que (starting & running) .............................................. 4.0 oz.-in. (2.8 ncm) maximum v ariation ........................................................................ 1.0 oz.-in. (0.71 ncm) maximum backlash ...................................................................................................... 1.0 maximum w eight .................................................................................................. appr oximately 20g t erminals ........................................................................................... gold-plated j-hooks markings ........... manufactur er s name and part number , r esistance value and date code panel hole pattern full r antirotation key view rotated 45 antirotation key 1 3 cw clockwise ccw 2 wiper 2 1 3 14.27 (.562) (no. 30 drill) 3.264 (.1285) ref. 12.65 (.498) dia. 25.40 (1.00) notes: 1. snap-in mounting cup accommodates panel thickness (.025) thru (.078) (no. 22ga thru no. 14ga) and (.125) .64 1.98 3.18 18.80 ?.38 (.740 ?.015) 16.26 ?.38 (.640 ?.015) 1.27 (.050) 4.76 ?.79 (3/16 ?1/32) 22.23 (7/8) dia. .724 (.0285) 31.496 (1.240) dia. tolerances: except where noted .25 .13 decimals: .xx (.010), .xxx (.005) fractions: ?/64 mm dimensions: (in.) #21 awg gold plated pins dia. located on radius 1 at r oom ambient: +25 c nominal and 50% r elative humidity nominal, except as noted. 2 consult manufactur er for complete specification details for r esistances below 500 ohms and above 100k ohms. featur es n snap-in mounting n space saving - extends only 5/8 behind most panels n easy one-hole, snap-in mounting n digital dial pr ovides excellent r eadability par t number resistance resolution (w) (%) 3610s-1-102 1,000 .035 3610s-1-502 5,000 .027 3610s-1-103 10,000 .022 recommended part numbers bold-f ace listings are in stock and readil y a v ailable through distribution. for other options consul t f actor y .
specifications ar e subject to change without notice. 272 3680 - pr ecision potentiometer electrical characteristics 1 standar d resistance range .......................................................... 50 ohms to 1 megohm resistance t olerance .................................................................................................. 3% absolute minimum resistance ............. 3 ohms or 0.2% maximum (whichever is gr eater) resolution 3682 ............................................................................................................................ 1% 3683 ......................................................................................................................... 0.1% insulation resistance (500 vdc) .............................................. 1,000 megohms minimum power rating (v oltage limited by power dissipation or 500 v ac, whichever is less) +25 c .................................................................................................................. 2 watts +85 c ..................................................................................................................... 0 watt dielectric withstanding v oltage .............................................. mil-std-202, method 301 sea level ......................................................................................... 1,000 v ac minimum accuracy (dial reading to output ratio) .................................................. 0.5% full scale envir onmental characteristics 1 operating t emperatur e range .................................................................. -25 c to +85 c t emperatur e coef ficient ............................................................... 100ppm/ c maximum v ibration ....................................................................................................................... 10g wiper bounce ......................................................................... 0.1 millisecond maximum t otal resistance shift .............................................................................. 1% maximum v oltage ratio shift ................................................................................ 0.2% maximum shock ........................................................................................................................... 50g wiper bounce ......................................................................... 0.1 millisecond maximum t otal resistance shift .............................................................................. 1% maximum v oltage ratio shift ................................................................................ 0.2% maximum load life ............................................................................................ 1,000 hours, 2 watts t otal resistance shift .............................................................................. 2% maximum mechanical characteristics 1 expected life ....................................................... 75,000 button operations each decade t otal resistance shift .............................................................................. 2% maximum t erminals ................................................. 0.11 in. (2.79mm) wide x .016 in. (.41mm) thick, tinned solder lugs for 3 #20 a wg wir es readout marking ..................................................................................... 10 positions, 0-9 markings ........... manufactur er s name and part number , r esistance value and date code 3680 7.77 ?.38 (.306 ?.015) 1 2 3 2 3 1 a c d b panel e 8.38 ?.38 (.33 ?.015) 1 3 incr. 2 wiper 7.87 (.31) 20.57 (.810) 23.62 (.93) 3.18 (.125) min. .81 (.032) max. 3.18 (.125) 26.67 (1.050) tolerances: except where noted .38 .13 decimals: .xx (.015) .xxx (.005) fractions: ?/64 mm dimensions: (in.) 1 at r oom ambient: +25 c nominal and 50% r elative humidity nominal, except as noted. note: t er minals 1 & 3 ar e r eversed fr om illustration for models 3682 and 3684. dimensions weight (approx.) model a b c d e .015 ( .381) oz. gms. 3682 26.67 (1.050) 25.15 (.990) 10.67 (.420) 11.94 (.47) 8.38 (.330) .576 16.5 3683 37.08 (1.460) 35.31 (1.390) 18.54 (.730) 11.94 (.47) 4.19 (.165) .824 23.5 dimensions model f .010 ( .254) g .010 ( .254) 3682 21.08 (.830) 25.91 (1.020) 3683 21.08 (.830) 36.07 (1.420) recommended panel cutout f g .030 (.76) r max. featur es n repeatable settings n resolution to 0.001% n digital display pr ovides excellent r ead - ability n snap-in panel mount resistance 3682s-1 3683s-1 ( w ) 2 3 decade decade 1,000 -102 -102 5,000 -502 -502 10k -103 -103 50k -503 100k -104 recommended part numbers bold-f ace listings are in stock and readil y a v ailable through distribution. for other options consul t f actor y .
specifications ar e subject to change without notice. 273 h-385 - panel seal assembly physical characteristics 1 material (boot) ................................................................................... clear silicone rubber material (frame) .................................................................................... rigid black plastic expected life ....................................................................... 100,000 actuations minimum w eight h-385-2 .......................................................................................... appr oximately 8.50g h-385-3 .......................................................................................... appr oximately 9.92g application data ? pr otects fr ont of the pot fr om unwanted entry of rain, dust, gr ease or oils ? t ranspar ent for easy viewing of numerals ? t ear r esistant for long life ? matte finish black plastic frame to complement most fr ont panels bour ns ? model h-385 panel seal assembly minimizes accidental entry of liquids or for eign matter thr ough the fr ont of the model 3680 family potentiometer . 1 2 3 4 1 at r oom ambient: +25 c nominal and 50% r elative humidity nominal, except as noted. frame panel cutout/ for use with part number dimensions hole dimensions c a b 3682 h-385-2 50.60 (1.992) 25.91 (1.020) 39.37 (1.550) 3683 h-385-3 60.76 (2.392) 36.07 (1.420) 49.53 (1.950) panel cut-out/hole dimensions recommended hole for two #6 screws (not supplied) "b" ? (.010) "c" ? (.010) 10.54 ?.13 (.415 ?.005) 21.08 ?.25 (.830 ?.010) "a" ? (.010) .25 6.73 ?.13 (.265 ?.005) .25 41.40 ?.38 (1.63 ?.015) .25 h-385 mounting instructions 1. cut out and drill panel 1 per chart. 2. install snap-in potentiometer 2 . 3. locate silicone boot 3 and frame 4 over potentiometer and holes. 4. attach panel seal assembly to panel with two #6 scr ews (not supplied). featur es n for use with model 3680 digital pushbut - ton pr ecision potentiometer
specifications ar e subject to change without notice. 274 cermet elements cermet elements ar e available in a wide range of r esistance values and tapers. they of fer essentially infinite r esolution and excellent stability in the most sever e envir onmental conditions. static and dynamic noise (cr v) performance is good but not as good as that of conductive plastic. the temperatur e coef ficient of cermet elements, though not as good as wir e - wound elements, is better than conductive plastic or carbon type elements. linearity is quite good for a film type element and can be impr oved considerably for gr eater dial setting accuracy by laser tailoring. fr equency r esponse of cermet materials is very good and the practical application range extends well beyond 100 mhz. conductive plastic elements conductive plastic is a thick film ink, similar to cermet, but has a smoother sur - face. this characteristic of fers several operational advantages over cermet. dynamic noise characteristics (cr v or output smoothness) and r otational life ar e measurably impr oved as a r esult of the surface smoothness. resolution is essen - tially infinite. conductive plastic elements ar e gener - ally available in a wide range of r esistance values and tapers. moistur e r esistance, temperatur e coef - ficient, power dissipation and wiper cur - r ent capacity for conductive plastic ele - ments ar e not as good as cermet ele - ments. wir ewound elements wir ewound elements of fer good stabili - ty , excellent linearity , low noise, high power capabilities and good o perational life. wir ewound elements of fer a wide selection of r esistance values up to 500k ohms. one primary limitation of wir ewound elements is the finite r esolution steps, which r esult fr om the wiper moving fr om tur n to tur n. (these steps ar e distinct, sud - den, r epeatable changes in output.) resolution impr oves as r esistance values incr ease due to the manufacturing pr ocesses wher eby smaller wir e and a higher number of tur ns ar e utilized. in systems that might be sensitive to such discr ete steps, car e should be taken to select an element with r esolution fine enough to avoid dif ficulty . the many tur ns of r esistance wir e exhibit an inductive r eactance that incr eases dir ectly with fr equency . this ef fect is most noticeable in low total r esis - tance elements because the inductive r eactance can be lar ger than the r esistance, even at fr equencies as low as 20khz. the performance of wir ewound elements is also af fected by inher ent capacitance. capacitance exists fr om tur n to tur n and also between the winding and the mandr el. capacitance ef fects ar e most significant in high total r esistance ele - ments. hybritr on ? elements this element is a combination of a wir ewound element with a conductive plastic coating. it exhibits the temperatur e coef ficient and r esistance stability appr oaching a pur e wir ewound element. it displays the long operational life, essen - tially infinite r esolution and low noise characteristics of the pur e conductive plastic elements. the combination of the two pr ovides the major benefits of both types of elements. not r ecommended in applications r equiring high wiper curr ents. caution: conductive plastic and hybritron ? elements should be applied in vol t age divider circuits onl y . absolute minimum resistance definition the r esistance measur ed between the wiper terminal and either end terminal when the wiper is positioned to give a minimum value on the measuring device. test procedure the wiper shall be positioned at one end of the r esistance element so that a minimum value of r esistance shall be measur ed as specified between the wiper and the corr esponding end terminal. the same pr ocedur e shall be followed for the opposite end of the r esistance element. contact resistance v ariation (cr v) definition the appar ent r esistance seen between the wiper and the r esistance element when the wiper is ener gized with a speci - fied curr ent and moved over the adjust - ment travel in either dir ection at a con - stant speed. the output variations ar e measur ed over a specified fr equency bandwidth, exclusive of the ef fects due to r oll-on or r oll-of f of the terminations and expr essed in ohms or per cent of total r esistance test pr ocedur e cr v shall be tested using the cir cuit as shown in fig. 1 on page 253 of potentiometer handbook (or its equiva - lent). the operating shaft shall be r otated in both dir ections thr ough 90% of the adjustment travel for a total of 6 cycles. only the last 3 cycles shall count in deter - mining whether or not a contact r esis - tance variation is observed at least twice in the same ar ea (within 5%), exclusive of the r oll-on or r oll-of f points wher e the wiper moves fr om the termination, on or of f, the r esistance element. the rate of r otation of the operating shaft shall be such that the wiper completes 1 cycle in 5 seconds, minimum, to 2 minutes, maxi - mum. the test curr ent used shall be in accor dance with the table below , unless otherwise specified. t est cur r ent ( 20%) t otal resistance range 30 ma 50 ohms 10 ma = or >50 ohms to <500 ohms 1 ma = or >500 ohms to <100k ohms 100 ua = or >100k ohms to <2 megohms 50 ua = or >2 megohms dielectric withstanding v oltage definition the ability to withstand under pr e - scribed conditions, a specified potential of a given characteristic between the ter - minals of each cup and exposed con - ducting surface of the potentiometer , or between the terminals of each cup and the terminals of every other cup in the assembly without exceeding a specified leakage curr ent value. test procedure the magnitude of the test voltage shall be specified. connect the equipment by applying the high voltage sour ce between the potentiometer terminals (inter connect - ed) and the shaft or case. raise the test voltage fr om zer o to the pr oper maximum value at a rate of 500 volts per second maximum. maintain the test voltage at this level while operating the shaft thr ough one full sweep of its mechanical travel in a time interval of not less than 5 seconds nor mor e than 60 seconds. monitor the definitions and t est pr ocedur es
specifications ar e subject to change without notice. 275 definitions and t est pr ocedur es leakage curr ent indicating device thr ough - out this test for evidence of damage, ar c - ing, br eakdown, or leakage curr ent in excess of 1 milliamper e. upon completion of the test, prior to disconnecting the leads, gradually r educe the test voltage to zer o. for ganged potentiometers, r epeat the for egoing applying the high voltage between the terminals of each cup and the terminals of every other cup on the potentiometer under test. equivalent noise resistance (enr) definition any spurious variation in the electrical output not pr esent in the input, defined quantitatively in terms of an equivalent parasitic transient r esistance in ohms, appearing between the contact and the r esistance element when the shaft is r otated or translated. the equivalent noise r esistance is defined independently of the r esolution, the functional characteristics, and the total travel. the magnitude of the equivalent noise r esistance is the maxi - mum departur e fr om a specified r efer ence line. the wiper of the potentiometer is r equir ed to be excited by a specified cur - r ent and moved at a specified speed. test procedure the potentiometer shaft is cycled not less than ten times over a minimum of 95% of the electrical continuity travel within the rated travel speed of the poten - tiometer just prior to making noise mea - sur ements. the potentiometer shaft is then connected mechanically to the con - stant speed drive and electrically connected to the test cir cuit. with the constant speed drive engaged, the poten - tiometer noise characteristic may then be noted on the oscilloscope as the wiper traverses one complete cycle over the full electrical continuity travel and the maxi - mum values ar e compar ed to the speci - fied limit. if only random spikes of noise ar e noted, the potentiometer should be cycled again. if the random spikes ar e r epetitive, the maximum values should be noted. otherwise do not consider the ini - tial measur ements as noise. independent linearity definition the maximum deviation expr essed as a per cent of the total applied voltage, of the actual function characteristic fr om a straight line whose slope and position minimize the maximum deviations over the actual electrical travel, or any speci - fied portion ther eof. test procedure consult factory . insulation resistance definition the r esistance to a specified impr essed dc voltage between the termi - nals of each cup and the exposed con - ducting surfaces of the potentiometer , or between the terminals of each cup and the terminals of every other cup in the gang, under pr escribed conditions. test procedure inter connect all electrically insulated terminals of each cup of the potentiome - ter . connect the insulation r esistance test set to the terminal of the first cup and to some exposed conducting surface (shaft, housing, etc.) and apply the specified test voltage. unless otherwise specified the test voltage shall be 500 vdc. maintain the test voltage at this level for 5 to 10 seconds befor e initiating movement of the shaft thr ough one full sweep of the total mechanical travel in a time interval of not less than 5 seconds nor mor e than 60 seconds. monitor the indicated insula - tion r esistance during this voltage appli - cation, the insulation r esistance is the minimum value observed during the movement of the shaft. for ganged potentiometers, r epeat the pr ocedur e for each cup applying the high voltage between the terminal of each cup and the exposed conducting surface of the potentiometer . output smoothness definition the spurious variations in the electri - cal output not pr esent in the input. they ar e measur ed for specified travel incr e - ments over the theor etical electrical travel and expr essed as a per centage of the total applied voltage. test procedure mount the potentiometer in the con - stant-speed drive (4 rpm) and excite it with the power supply . connect the wiper and the power common lead to the input of the filter and the output of the filter to the oscilloscope. when a load is specified for a conformity test, use that load for the output smoothness test. when no load is specified for the conformity test, apply a load equal to 100 times the nominal r esis - tance value of the potentiometer under test between the wiper and the ccw end (unless otherwise specified). the output smoothness is the lar gest excursion voltage occurring over one specified travel incr ement, divided by the total applied voltage. unless otherwise specified, the travel incr ement is 1% of the theor etical electrical travel. excursions occurring at the point of abrupt changes in input slope (start, end, and r eversal) ar e not consider ed output smoothness faults. power rating definition the maximum power , in watts, that a potentiometer can dissipate acr oss the entir e r esistive element under specified conditions while meeting specified oper - ating performance r equir ements. resolution definition a measur e of the sensitivity to which the output of a potentiometer may be set. (applicable to wir ewound potentiometers only .) theor etical r esolution; the r ecipr ocal of the number of tur ns of wir e in the r esis - tance winding in the actual electrical trav - el, expr essed as a per centage. t ravel r esolution; the maximum value of shaft travel (in degr ees for r otary devices) in one dir ection per incr emental voltage stop in any specified portion of the r esistance element. v oltage r esolution; the maximum incr emental change in output ratio with shaft travel in one dir ection in any speci - fied portion of the r esistance element. test procedure consult factory .
specifications ar e subject to change without notice. 276 t emperatur e coef ficient of resistance definition the unit change in r esistance per degr ee celsius change fr om a r efer ence temperatur e, expr essed in parts per mil - lion per degr ee celsius using the following formula: tc = [(r1-r2)/r1(t2-t1)] x 106 where: r1 = resistance at r efer ence temperatur e in ohms r2 = resistance at test temperatur e in ohms t1 = refer ence temperatur e in degr ees celsius t2 = t est temperatur e in degr ees celsius test procedure position the wiper of the potentiometer to be tested of f of the actual electrical travel or at a point to minimize the total r esistance if no over travel exists. subject the potentiometer to the specified test temperatur e(s). the total r esistance is measur ed after temperatur e chamber has been stabilized for the test temperatur e for a minimum of 30 minutes (avoid over aging). the r efer ence temperatur e of 25 degr ee celsius shall be used for all elevat - ed and r educed temperatur es. calculate the (tc) by inserting the appr opriate data into the above formula and comparing the r esult to the specification. t otal resistance definition the dc r esistance between the end terminals of a potentiometer with the shaft positioned so as to give a maximum r esistance value. test procedure with the vom or dvm device (10ma maximum curr ent) connected between the wiper and one end terminal, position the wiper onto the electrical overtravel. reconnect the test leads of the measur - ing device to the end terminals of the potentiometer under test, the r eading observed is the total r esistance of the potentiometer . definitions and t est pr ocedur es

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