tusonix' 538 series described on this page is miniaturized for today's circuitry. all ceramic construction with optically flat interfaces provides tuning smothness not obtainable with com- pression type trimmers. the silver electrodes are intimately bonded to the top surfaces of the base and rotor. the terminals and other metal parts are non-ferrous and silver- plated to provide excellent conductivity and trouble free soldering. a variety of capaciatance ranges, ter- minations and mounting provisions make these popular trimmers ideal for nearly all applications. ordering data specify series 538 followed by the three digit terminal variation you select from the chart below. then list the dielectric type code you select from the table at the right and the corresponding capacitance range. example: 538-002 a 2.0-8 pf mil c-81 designation mil cv31 tusonix style 538-054 cv31a080 cv31b110 cv31c100 cv31d150 cv31a180 cv31b250 cv31c250 cv31d350 cv31e600 mil c-81 designation mil cv32 tusonix style 538-067 cv32a080 cv32b110 cv32c100 cv32d150 cv32a180 cv32b250 cv32c250 cv32d350 cv32e600 dielectric type code (see page 2) a b a c d b a f d b c d f capacitance range (pf) 2.0 to 8 2.5 to 11 3.0 to 10 3.0 to 10 3.0 to 15 3.5 to 14 5.5 to 18 5.0 to 25 5.5 to 25 7.0 to 25 8.0 to 25 9.0 to 35 15.0 to 60 200-350 wvdc ceramic trimmers series 538 miniature above are shown a few of the many mechanical variations available. for special designs tailored to your application, contact your nearest tusonix sales office or call the factory direct at 520-744-0400 for dimensions 0.125"/3.18mm, tolerance is 0.015/0.38 for dimensions 3 0.126"/3.20mm, tolerance is 0.030/0.76 specifications see page 2. revised 9/98 teminal variation options 002 004 006 008 017 022 026 037 011 073 012 074 014 076 0.109/2.77 dia. mounting holes 0.109/2.77 dia. mounting holes 0.047/1.19 dia. mountingholes 0.109/2.77 dia. mounting holes 0.047/1.19 dia. mounting holes 0.047/1.19 dia. mounting holes 0.047/1.19 dia. mounting holes 0.047/1.19 dia. mounting holes 0.109/2.77 dia. mounting holes 0.047/1.19 dia. mounting holes 0.047/1.19 dia. mounting holes 0.047/1.19 dia. mounting holes 0.047/1.19 dia. mounting holes 0.051/1.29 dia. mounting holes .275 6.99 .363 9.22 0.275 6.99 .363 9.22 .100 2.54 top & bottom adjust .300 7.62 .150 3.81 .145 / 3.68 .405 10.29 .040 1.02 stator term. .200 5.08 .140 3.56 .500 12.7 .329 8.36 .300 7.62 .100 2.54 .275 6.98 .181 4.59 .533 13.53 .262 6.65 .387 9.83 .040 1.02 .100 2.54 top & bottom adjust .062 1.57 .486 11.89 .220 5.59 0.187 4.75 0.363 9.22 .040 1.02 .012 .304 .270 6.85 .250 6.35 .194 4.93 .300 7.62 .300 7.62 .150 3.81 .150 3.81 .200 5.08 .400 10.16 .170 4.31 .140 3.55 .197 5.0 .154 3.91 .068/1.72 min i.d. .100 2.54 o.d. .300 7.62 .065 1.65 .100 2.54 indicates rotor terminal .012 0.30 0.035 0.89 .275 6.99 stator terminal .375 9.53 .125 3.18 max. .200 5.08 .585 14.86 .585 14.86 .130 3.30 .046 dia. 1.17 .046 1.17 .093 2.36 adjusting slot .032/0.81 wide x .030/.076 deep 538-000
specification 538 series ceramic trimmer capacitors capacitance: when measured at room temperature (25 c 5c) and at a fre- quency of 0.1 to 1 megahertz, the minimum capacitance shall not be greater than that specified at minimum setting with a +10% tolerance, and the maximum capacitance shall not be less than that specified at max- imum setting with a -10% tolerance. "q" factor: when measured at room temperature (25 c 5c), at a frequency of approximately 1 mega- hertz, the capa- citor at approximately maximum rated cap- acitance setting shall have a "q" value not less than indicated for the respective style. insulation resistance: the insulation resistance at approximately maximum capa- citance setting shall be 10 gigaohms minimum at room temper ature of (25 c 5c) when measured at 100 volts dc in a series with a protec tive resistance not exceeding 1 meg ohm after no more than one minute application of the voltage. dielectric strength: the capacitor, set at approximately maxi mum capacitance shall withstand volt age between terminals for 1 to 5 sec. as indicated for the respective style. (50ma maximum charging current) torque: when measured at room tempera- ture (25 c 5c), the torque required to start and maintain rotation of the rotor through one full turn, shall be as indicated for the respec- tive style. temperature characteristic: the temperature characteristic of capacitance shall be within the limits shown in the following table. the temperature characteristic shall be de- termined by measuring the capaci ance (capa- citor shall be set at approx imately 75% of the guaranteed maxi mum capacitance) +25c, -55c, and either +85c or +125c, which ever is applicable to the respective style, at a fre- quency of 0.1 to 1 megahertz. each measure- ment shall be made after the capacitor has reach- ed thermal stability. capacitance drift: capacitance drift: with the capacitor set at approximately 75% of the guaranteed maximum capaci tance, the capacitance drift shall be deter- mined as the greatest difference between any two of three 25c mea surements, when temperature cycled as follows: +25c, -55c, +85c or +125c, whichever is applicable to respective style, +25c. the capaci tance drift shall not exceed 0.75% or 0.5 r f, whichever is greater. accelerated life test: the cap- acitor, at approximately 75% of the guar- anteed maximum capaci tance, shall be tested for 250 hours at twice rated voltage, and at a tempera ture equal to the maximum operating temperature 3c for the respec- tive style. at the end of this period the cap- acitance shall not have changed more than 5% of its value before the life test or 0.5 r f, whichever is great er; the insulation resist- ance shall be 1 gigaohm minimum and the "q" at 1 m egahertz shall be at least 40% of the initial test limit. temperature cycling & humidity: t he capacitor, at approx imately 75% of the guaranteed maxi mum capacitance, shall be given a treatment consisting of 5 tempera- ture cycles as follows: cool capacitor to -55c 3c. remove the capaci tor from the cooling chamber and allow it to reach room temperature. then place in an oven at a temperature equal to maximum operating tempera ture 3c of the respective style. remove from oven and allow capaci tor to cool to room temperature. the capacitor shall be held at the specified minimum and maximum temperatures long enough to reach equilibrium, and in no case less than 15 minutes. the rate of change of temper- ature in cool ing from room temperature, or heating above it, shall not be less than 3c per minute. the temperature cycles shall be followed by exposure for 96 hours to a relative humidity of 95% at 40c 3c. the capacitor shall then be removed from the humidity cham ber and held at 25c 5c with a maximum humidity of 50% for four hours. the insulation resistance shall be at least 1 gigaohm, the "q" at 1 mhz is at least 40% of initial test limit and the cap- acitance shall not have changed by more than 3% or 0.5 r f, whichever is greater, from its value prior to the start of the tem- perature cycling. dielectic type code percent capacitance change from value @ 25c -55c +85c min. max. min. max. a b +125c min. max. -4.5 -1.0 +2.0 +3.5 -2.5 +2.0 -0.5 -4.2 -4.2 +3.4 -0.8 c +6.5 -4.0 -1.0 -6.7 -1.7 d +7.0 -5.0 -1.5 -8.5 -2.5 f +16.0 -11.0 -6.0 -15.0 -9.0 -1.0 +1.5 +6.0 -2.5 specifications for 538 trimmer capacitors working voltage...a,b,c: 350 wvdc @ 85c; 200 wvdc @ 125c d& f: 200 wvdc @ 85c; 100 wvdc @125c dielectric strength ............................................500 vdc for 1-5 sec. operating temperature range................................-55c to +125c torque..................................................................................1-6 oz. in. marking: all units will be marked with tusonix trademark, capacitance range and dielectric code. example: t 4-15 a
|
