MIL-PRF-19978/1F
Barometric pressure (reduced): In accordance with MIL-PRF-19978.
Test points:
Circuit diagram 1: Between terminals and case.
Circuit diagram 3: Between ungrounded terminal and case.
Insulation resistance (IR):
Sleeving: In accordance with MIL-PRF-19978.
Terminal to terminal: See table II.
Terminal to case: In accordance with MIL-PRF-19978 except that characteristic K shall be 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 atmosphere (corrosion): In accordance with MIL-PRF-19978.
TABLE II. Terminal-to-terminal insulation resistance.
Capacitance rating
Minimum insulation resistance
At 25°C
Characteristic K
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/
At 25°C
Characteristic M
0 to 0.68 microfarad
100,000 megohms
Greater than 0.68 microfarad
68,000 megohm-microfarads 1/
At 85°C
0 to 0.2 microfarad
25,000 megohms
Greater than 0.2 microfarad
5,000 megohm-microfarads 1/
At 25°C
Characteristic P
0 to 1.0 microfarad
100,000 megohms
Greater than 1.0 microfarad
100,000 megohm-microfarads 1/
At 65°C
0 to 1.0 microfarad
40,000 megohms
Greater than 1.0 microfarad
40,000 megohm-microfarads 1/
At 25°C
Characteristic T
0 to 1.0 microfarad
100,000 megohms
Greater than 1.0 microfarad
100,000 megohm-microfarads 1/
At 170°C
0 to1.0 microfarad
40,000 megohms
Greater than 1.0 microfarad
750,000 megohm-microfarads 1/
1/ Product obtained by multiplying the capacitance in microfarads by the insulation
resistance in megohms.
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