MIL-C-19978/18B
Barometric pressure, qualification only: In accordance with MIL-PRF-19978.
Test points (see figure 1, circuit diagram):
Circuit diagram 1: Between terminals and case.
Circuit diagram 3: Between ungrounded terminal and case.
Insulation resistance (IR):
Terminal to terminal: See table III.
TABLE III. Terminal-to-terminal insulation resistance.
Capacitance rating
Minimum insulation resistance
At 25°C
0 to 0.6 microfarad
25,000 megohms
Greater than 0.6 microfarad
15,000 megohm-microfarads 1/
At 125°C
0 to 0.08 microfarad
250 megohms
Greater than 0.08 microfarad
20 megohm-microfarads 1/
1/ Product obtained by multiplying the capacitance in microfarads by
the insulation resistance in megohms.
Terminal to case: Greater than 10,000 megohms.
Vibration, high frequency: Method 204 of MIL-STD-202, test condition B, with the following exception:
Direction and duration of motion - 4 hours in each of two mutually perpendicular directions (total of 8 hours), one
parallel and the other perpendicular to the cylindrical axis.
Salt spray: In accordance with MIL-PRF-19978.
Solderability: In accordance with MIL-PRF-19978.
Terminal strength: Method 211 of MIL-STD-202, test condition letter D.
Stability at low and high temperature:
Low temperature:
Test temperature: -65°C +0°, -5°C.
Capacitance change (max): -10 percent.
High temperature:
Test temperature: +125°C +5°, -0°C.
Capacitance change (max): +10 percent.
Life:
Capacitance change (max): ±5 percent.
Resistance to soldering heat: In accordance with MIL-PRF-19978.
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