MIL-PRF-19500/304E
4.5 Methods of inspection. Methods of inspection shall be as specified in the appropriate tables and as follows.
4.5.1 Pulse measurements. Conditions for pulse measurement shall be as specified in section 4 of MIL-STD-750.
4.5.2 Burn-in and steady-state operation life tests. These tests shall be conducted with a half-sine waveform of the
specified peak voltage impressed across the diode in the reverse direction followed by a half-sine waveform of the
specified average rectifier current. The forward conduction angle of the rectified current shall not be greater than
180°C nor less than 150°C.
4.5.3 Insulation resistance (case-to-stud). The case-to-stud insulation resistance shall be determined in terms of
current flow between the case and stud. The specified test method shall be utilized except that the applied voltage
shall be within ±2.0 percent of the specified value and the current shall be measured by a series microammeter with a
voltage drop at 1.0 µA dc of less than 1.0 V dc, and an accuracy of ±2.0 percent at the 1.0 µA dc point.
4.5.4 DC intermittent operation life. A cycle shall consist of an "on" period, when power is applied suddenly, not
gradually, to the device for the time necessary to achieve a delta case temperature of 85°C, +15°C, -5°C, followed by
an "off" period, when the power is suddenly removed, for cooling. Auxiliary (forced) cooling is permitted during the off
period only.
theating ≤ 5 minutes. P = VF x IF or P = VF(pk) x Iav if using sine wave current. DC full wave current shall be
used for the power required during the "on" period (or equivalent half sine wave current).
Within the time interval of 50 cycles before to 500 cycles after the termination of the test, the sample units shall be
removed from the specified test conditions and allowed to reach room ambient test conditions. Specified end-point
measurements for qualification and conformance inspection shall be completed within 96 hours after removal of
sample units from the specified test conditions. Additional readings may be taken at the discretion of the
manufacturer.
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