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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 \(see 3.1\).

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MIL-PRF-22097J
TABLE III. Resistance temperature characteristic (characteristic A).
+55OC
+85OC
+125OC
-55OC
-25OC
+25OC 1/
Nominal resistance
(in ohms)
Percent
±1.0
±1.5
±4.0
100
to
500
Incl.
+4.5
+2.5
0
±1.0
±2.0
±5.0
1,000
to
5,000
Incl.
+5.5
+3.0
0
±1.0
±2.5
±6.0
10,000
to
50,000
Incl.
+7.0
+3.5
0
±1.5
±3.0
±6.5
100,000
to
500,000
Incl.
+8.0
+4.0
0
±1.5
±3.5
±8.0
Incl.
+10.0
+5.0
0
1,000,000
1/ reference temperature
1.2.1.5 Example of PIN. The PIN RJ24FP103 signifies;
Adjustment type, nonwirewound, variable, resistor of the dimensions specified (see 3.1).
RJ24
-
F
-
Having a characteristic signifying a maximum resistance temperature characteristic of
0.010 percent (±100 ppm) per/OC, and a capability of operation at rated wattage at 85OC
maximum, and when derated, at 150OC maximum (see figure 1).
Having printed circuit pins
P
-
Having a nominal total resistance value of 10,000 ohms.
103
-
Characteristic C and F
Characteristic A
85
70
100
80
60
40
20
0
-65 -50
-25
0
25
50
75
100
125
150
170
O
Ambient Temperature ( C)
FIGURE 1. Derating curve for high ambient temperatures.
3



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