MIL-PRF-22097 Resistors, Variable, Nonwirewound, Adjustment Type, General Specification ForThis specification covers the general requirements for multi-turn lead screw actuated and single turn nonwirewound, variable resistors with a contact bearing uniformly over the entire surface of the entire resistive element, when positioned by the actuator. These resistors are capable of full load operation \(where maximum resistance is engaged\) at a maximum ambient temperature of 70 Degrees C and 85 Degrees C, and are capable for continuous operation when properly derated, at a maximum temperature of 125 Degrees C and 150 Degrees C \(see figure 1\). These resistors have a resistance of ┬▒10 percent \(see 3.1\).

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14

MIL-PRF-22097J

TABLE I. Characteristics.

Characteristic

Requirement

Maximum resistance temperature characteristic (3.14)

Percent per OC

See table III

�0.025

�0.010

ppm/OC

�250

�100

70OC

85OC

Maximum ambient temperature at rated load 1/

125OC

150OC

Maximum ambient temperature at zero load derating 1/

Contact resistance variation (3.9)

See notes

Maximum percent change in total resistance

Thermal shock (3.13)

Moisture resistance (3.15)

Shock (specific pulse) (3.16)

Vibration, high frequency (3.17)

Resistance to soldering heat (3.19)

Life (3.20)

Low temperature operation (3.21)

High temperature exposure (3.22)

Rotational life (3.23)

1/ see figure 1

NOTES:

1. Where "1" is specified for total resistance change, it is considered as �1 percent +0.05 ohm.

2. For characteristic "C" only, contact resistance variation will not exceed 3 percent or 20 ohms, whichever is

greater.

3. For characteristic "F" only, contact resistance variation will not exceed 3 percent or 3 ohms, whichever is

greater.

TABLE II. Terminals.

Symbol

Type of terminal

Flexible, insulated wire leads.

Printed circuit pins.

Solder lugs.

Printed circuit pins (edge mounted).

Printed circuit pins (edge mounted, alternate configuration)

Printed circuit pins (staggered)

1/ Applicable to all characteristics except characteristic A.

2/ Applicable to all characteristics.

3/ Applicable only to characteristic A, and to be used for replacement only.

4/ Applicable to all characteristics. Available only essentially square styles.

Pins extended from the edge 180 degrees away from the adjustment

head and are parallel to the longitudinal axis of the adjustment screw.

5/ Applicable to all characteristics. Available only essentially square styles.

Pins extend from the edge 90 degrees away from the adjustment head

and are perpendicular to the longitudinal axis of the adjustment screw.

6/ Applicable only to style RJ12.