MIL-PRF-19500/500E
4.5 Methods of inspection. Methods of inspection shall be as specified in the appropriate tables as follows.
4.5.1 Group C steady-state operation life test (alternate procedure). When the group B, 340-hour life test is
continued on test to 1,000 hours to satisfy the group C life test requirements, the test shall be performed as given in
4.3.1 herein with the following exception: Step 4.3.1.d shall be repeated at the end of the 1,000 hours.
4.5.2 Maximum peak pulse current (IPP). The peak pulse currents specified in column 7 of table II herein shall be
applied while simultaneously maintaining a bias voltage of not less than the applicable voltage specified in column 4
of table II, in the same polarity as the peak pulse current. The peak pulse current shall be applied with a current vs
time waveform as follows (1 pulse per minute maximum):
a. Pulse current shall reach 100 percent of IPP at t 10 s and decay to 50 percent of IPP at t 1 ms for
tp = 1 ms (see figure 4).
b. Pulse current shall reach 100 percent of IPP at t 8 s and decay to 50 percent of IPP at t 20 s for
tp = 20 s (see figure 5).
4.5.3 Clamping voltage. The peak pulse clamping voltage shall be measured across the diode in a 1 ms time
interval. The response detector shall demonstrate equipment accuracy of ±3 percent. The peak clamping voltage as
specified in column 6 of table II shall be applicable to the 1 ms pulse of 4.5.2.a only.
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