MIL-PRF-15733J
4.6.5 Dielectric withstanding voltage (see 3.8). Filters shall be tested in accordance with method 301 of MIL-STD-
202. The following details and exceptions shall apply:
a. Test voltage - Unless otherwise specified (see 3.1), the test voltage shall be dc and shall be as follows:
(1) DC rated only: 2.5X rated voltage.
(2) For filters with ac and dc ratings: 2.5X rated dc voltage.
(3) AC rated only: 2.8X rated rms voltage.
b. Duration of application of test voltage: 5 seconds minimum, 1 minute maximum.
c. Points of application of the test voltage: The test voltage shall be applied between the case (ground)
and all live (not grounded) terminals of the same circuit connected together.
d. Charging current: 50 mA maximum.
e. The sensitivity of the breakdown test equipment shall be sufficient to indicate breakdown when at least
0.5 milliamperes of leakage current flows through the filter under test.
4.6.6 Barometric pressure (reduced) (see 3.9). Filters shall be tested in accordance with method 105 of
MIL-STD-202. The following details shall apply:
a. Method of mounting: Securely fastened by normal mounting means.
b. Test condition letter: B.
c. Test during subjection to reduced pressure: Dielectric withstanding voltage as specified, except that the
dc test voltage shall be 125 percent of the rated dc voltage, or 210 percent of the rated ac (rms) voltage
if filter is only ac rated.
d. Examination after test: Filters shall be examined for evidence of flashover, breakdown, or impairment
that would cause failure.
4.6.7 Insulation resistance (terminal to ground) (see 3.10). Filters shall be tested in accordance with method 302
of MIL-STD-202. The following details shall apply:
a. Test condition letter: A.
b. Special preparations or conditions: Measurements shall be carefully made to prevent damage to the
filter seal. When filters fail this test due to ambient relative humidity in excess of 50 percent, they may
be retested at any relative humidity from 20 to 50 percent.
c. Points of measurements: Between the case (ground) and all live (not grounded) terminals of the same
circuit connected together.
d. Maximum charging current: 50 mA.
e. At the manufacturer's option, measurements can be made of the dc leakage current at the specified test
voltage. The equivalent insulation resistance can then be calculated.
4.6.8.1 For filters rated ac only (see 3.1). The voltage drop is the difference between the input voltage to the filter
and the output voltage of the filter when the filter is carrying rated current at rated voltage, with a resistive load at
maximum rated frequency. The method of voltage measurement is shown on figure 2. Measurements shall be made
by using expanded scale-type meters which will enable voltage differences of less than 1 volt to be read.
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