MIL-PRF-1/1756B
TABLE I. Testing and inspection - Continued.
Conditions
Limits
Unit
Inspection
Method
Symbol
Min
Max
Conformance inspection,
part 3
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No voltages
Torque 5/ 7/
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Condition A; no voltages; fixture.
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Shock, specified pulse 5/
1042
Torque and shock test
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end point:
µA dc
-10
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Ic
1266
Total grid current
1/
All test listed under conformance inspection, part 1, shall be performed at the conclusion of the holding period.
2/
The electrode voltage (2) grid test may be performed alternately in the following manner:
Eb = 600 V dc; Ec/Ib = 1.0 mA dc; and the limit for Eco shall be -15.0 V dc (max).
3/
Grid-anode resonance. Test in cavity. Cavity shall resonate at 1,354 ±2.0 MHz with tuning slug at TA = 25ºC ±5ºC.
Grid-cathode resonance. Test in cavity. Cavity shall resonate at 1,719 ±2.0 MHz with tuning slug at TA = 25ºC ±5ºC.
W hen plotted on graphs of resonant frequency versus grid-anode capacitance and resonant frequency versus gird-cathode
capacitance, the tube under test shall be represented by a point within a parallelogram whose four corners are located by the
following points:
Points
Capacitance (pF)
Frequency (MHz)
C-gp
C-gk
F-gp
F-gk
1,730
1,965
6.30
1.85
1
1,780
2,015
6.30
1.85
2
1,690
1,850
7.50
2.15
3
1,740
1,900
7.50
2.15
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4/ At zero hours, establish the drive conditions necessary to obtain ib = 2.0 a (peak anode current) with Eb = 2,000 V dc and a bias
voltage Ec = -40 V dc. the pulse width (tp) of the modulator shall be 2 µs minimum and the duty (Du) shall be 0.0025 maximum.
W ith the drive level determined at zero hours, check the anode current at end of life. The maximum allowable drop in anode current
(Ćib) shall be 25 percent.
5/ This test will be performed quarterly, with 8 samples. Acceptance shall be based upon accept on zero failures. All tests shall be
considered as nondestructive except in case of failure, and separate samples may be used for each test at the option of the
manufacturer. In case if failure, the failing test shall become a conformance inspection, part 2, acceptance on zero failures, for three
consecutive successful submissions, at which time the testing may revert to the conformance inspection, part 3 basis.
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