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MIL-PRF-94 Resistors, Variable, Composition General Specification ForThis specification covers the variable resistors having a composition resistance element shaped in an arc, and a contact bearing uniformly thereon, so that a change in resistance is produced between the terminal of the contact and the terminal of either end of the resistance element when the operating shaft is turned. These resistors are capable of full load operation \(where maximum resistance is engaged\) at a maximum ambient temperature of 70 degrees C and are capable for continuous operation when properly derated, at a maximum temperature of 120 degrees C \(see 6.9\).

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MIL-PRF-94G
TABLE II. Switch.
Symbol
Switch
A
No switch
Single pole, single throw switch
which is actuated to the "on"
B
position at the start of the
clockwise rotation
1.2.1.4 Temperature and moisture-resistance characteristic. The temperature and moisture resistance
characteristic is identified by a single letter in accordance with table III.
TABLE III. Temperature and moisture resistance characteristic.
Allowable change in
Maximum ambient
Maximum ambient
Insulation
total resistance due to
operating
temperature at rated
Symbol
resistance
moisture resistance
temperature
wattage
10 percent
100
120OC
70OC
Y
(maximum)
megohms
1.2.1.5 Operating shaft. The operating shaft styles and lengths are identified by a two digit symbol. The first letter
indicates operating shaft in accordance with table IV, and the second letter indicates operating shaft length, as
specified (see 3.1).
TABLE IV. Style of operating shaft.
Symbol
Shaft
F
Flatted
S
Slotted
1.2.1.6 Resistance. The nominal resistance value expressed in ohms is identified by a three digit number. The
first two digits represent significant figures and the last specified the number of zeros to follow.
1.2.1.7 Resistance characteristic. The resistance characteristic is identified by a single letter in accordance with
table V.
TABLE V. Resistance characteristic.
Resistance taper
Resistance tolerance
Symbol
(in percent)
±10
A
A
±20
B
A
±10
C
C
±20
D
C
±10
E
F
±20
F
F
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