MIL-PRF-1/262H
TABLE I. Requirements and tests - Continued.
(c)
Rating chart III. This chart shows the minimum value of anode supply resistance (Rs) required to remain within the
transient peak-anode current rating. The value of Rs should be such that it lies to the left of the line on the rating
chart at the highest probable value of line voltage. Rating chart III applies to capacitor-input filter operation only.
(d)
Rating chart IV. This chart presents the maximum ratings for anode-supply voltage and altitude. Rating chart IV
refers to both capacitor-input filter and choke-input filter operation.
2.
All values of Epp/a refer to the unloaded supply voltage. The ratings refer to rectifier operation with sinusoidal supply
voltages within the frequency range of 25 to 1,000 Hz.
3.
Test each section separately.
4.
Adjust Zp/a in a full-wave circuit so that the TUT indicates Io = 75 mA dc. TUT has a tube drop of Etd = 22 V dc at
Is = 70 mA dc per anode.
5.
This test shall be performed at the conclusion of the holding period.
6.
This test shall be conducted on the initial lot and thereafter on a lot approximately every 12 months. When one lot has
passed, the 12-month rule shall apply. In the event of the lot failure, the lot shall be rejected and the succeeding lots shall
be subjected to this test until a lot passes.
7.
In a full-wave life-test circuit the values specified for R1 and C1 may be considered as approximate and shall be adjusted
initially to give not less than Io = 75 mA dc and ib/a = 270 ma with a TUT.
8.
Envelope temperature (TE) requirements, when measured in accordance with the temperature by conduction-band
measurement (MIL-STD-1311, method 1226), will be satisfied if a TUT having bogey Ib (±10 percent) under normal test
conditions, is determined to operate at or above minimum specified temperature at any position in the life-test rack.
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