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MODEL 78
1-1/4" Rectangular Multiturn Cermet Trimming Potentiometer
ELECTRICAL
1
Standard Resistance Range, Ohms Standard Resistance Tolerance Input Voltage, Maximum Slider Current, Maximum Power Rating, Watts End Resistance, Maximum Actual Electrical Travel, Turns, Nominal Dielectric Strength Insulation Resistance, Minimum Resolution Contact Resistance Variation, Maximum
ENVIRONMENTAL
10 to 2Meg 10% (<100 Ohms = 20%) 300 Vdc or rms not to exceed power rating 100mA or within rated power, whichever is less 1.0 at 70C derating to 0 at 125C 2 Ohms 22 500 Vrms 1,000 Megohms Essentially infinite 1% or 1 Ohm, whichever is greater
Seal Temperature Coefficient, Maximum Operating Temperature Range Thermal Shock Moisture Resistance Shock, 6ms Sawtooth Vibration High Temperature Exposure Rotational Life Load Life at 0.5 Watts Resistance to Solder Heat
MECHANICAL
85C Fluorinert(R) (No Leaks) 100ppm/C -55C to +125C 5 cycles, -55C to +125C (1% RT, 1% VR) Ten 24 hour cycles (1% RT, IR 1,000 Megohms Min.) 100G's (1% RT, 1% VR) 20G's, 10 to 2,000 Hz (1% RT, 1% VR) 250 hours at 125C (2% RT, 2% VR) 200 cycles (3% RT) 1,000 hours at 70C (2% RT) 260C for 10 sec. (1% RT)
Mechanical Stops Torque, Starting Maximum Weight, Nominal
Fluorinert(R) is a registered trademark of 3M Company. Specifications subject to change without notice.
Clutch Action, both ends 5oz.-in. (0.035 N-m) .09 oz. (2.6 grams)
1-61
Model 78
SIDE ADJUSTMENT (Inch/mm)
Model 78P Housing Molded Plastic
Circuit Diagram Marked On This Surface Metal Adjustment Screw .110/2.794 0.127 Dia. With .025/0.635 0.127 Wide X .031/0.787 0.127 Deep Slot .195 .005 4.953 0.127
Model No. & Resistance Value Marked On This Surface
0.07 1.78 1.25 31.75 1.000 .005 25.400 0.127
.015 .003 0.127 0.076 2 Mounting Holes .093 .005 I.D. 2.362 0.127 (1) (2)
.125 .005 3.175 0.127 .105 2.667 .32 8.13 .135 .50 .03 (3) 3.429 12.70 0.76 .30 7.62 .260 .015 6.604 0.381
.70 17.78
3 Terminals Pins Solderable .028 .003 Dia. 0.711 0.076 .05 1.27 .10 2.54
Note: Model 78P dimensions applicable to all other models except as noted.
Model 78L .062/1.575 Max. Meniscus
3 Electrical Leads - 6/152 Min. Length No. 30 AWG Teflon Insulated Stranded Wire Yellow (1) Red (2) Green (3)
Model 78S
.187 .031 4.750 0.787 3 Terminals Pins Solderable .028 .003 Dia. 0.711 0.075 .05 .02 1.27 0.51 .10 .02 2.54 0.51
.156 .031 Dia. 3.962 0.787 (3 Places) .70 .02 17.78 0.51
(1)
(2)
(3) .30 .02 7.62 0.51 .26 .02 6.60 0.51
1-62
Model 78
PANEL MOUNT ADAPTER (Inch/mm)
1
Model 56BW (Adapter Only) Metal Bushing Mount Brass-Nickel Plated Mounting Surface .125 .005 Dia. Hole 3.175 0.127
Use .22/5.613 Dia. Min. Mounting Hole Lock Washer, Panel Nut, Sealing Washer & Mounting Screws Provided
.312 .015 7.925 0.381
1.56 Max. 3.962
.437 Max. 11.100
Model 78LBW (Adapter Pre-Assembled with Trimmer)
0.94 Max. 2.388
1.344 Max. 34.138
.250 .015 6.350 0.381
12-28 UNF-2A Thread
Model 78SBW (Adapter Pre-Assembled with Trimmer) 0.94 Max. 2.388 1.344 Max. 34.138 .250 .015 6.350 0.381
(1)
(2)
(3)
12-28 UNF-2A Thread .344 .031 8.738 0.787
1-63
Model 78
STANDARD RESISTANCE VALUES, OHMS
10 20 50 100
200 500 1K 2K
5K 10K 20K 25K
50K 100K 200K 250K
500K 1Meg 2Meg
PACKAGING
Standard:
Boxes Capacity
=
25 Units
ORDERING INFORMATION
78 P BW R 10K LF Model Series Pin Style RoHS Compliant Code - optional Resistance Value Resistance Prefix Optional Panel Mount Adapter
Note: Use `56BW' to order panel mount adapter without trimmer
CIRCUIT DIAGRAM
NOTES
Metric equivalents, based on 1 inch = 25.4mm are rounded to the same number of significant figures as in the original English units and are provided for general information only. Tolerances unless otherwise specified: Linear = .01 inches (.25mm) Angular = 2 degrees
(2) (1) CW (3)
INCH mm
1-64
Model 78

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