MIL-PRF-1/1712D
TABLE I. Testing and inspection - Continued.
9/
After the performance of the humidity and rough handling tests, the tube shall be capable of passing the following conformance
inspection tests:
Method
Test
4253
Gain (large signal)
4261
Spurious output or stability
4278
Phase shift
10/
At the conclusion of this test, the tube under test (TUT) shall be capable of satisfying the requirements of conformance inspection,
parts 1, 2, and 3 tests.
11/
The tube shall be rigidly mounted to the vibration table and shall be vibrated in accordance with MIL-STD-167-1, type I,
Environmental vibration, except the amplitudes shall be as indicated below. The detected output of the tube shall be displayed on
an oscilloscope. Prior to vibration, the oscilloscope shall be calibrated in the dc mode, using slow sweep, by means of a precision
attenuator. The face of the display tube shall be marked with lines corresponding to the saturated power output level, and to levels
of ±0.5 dB. The attenuator shall then be returned to the saturated power output level. The displayed variations attributable to
vibration shall be within the calibration lines.
Frequency
Amplitudes
5 to 15 Hz
0.075 ± 0.012 (0.150 total displacement)
15 to 25 Hz
0.050 ± 0.008 (0.100 total displacement)
25 to 33 Hz
0.025 ± 0.004 (0.050 total displacement)
12/
The tube shall exhibit interruptions or discontinuities in power output and shall be capable of satisfying all conformance inspection
tests without damage or failure before and after performance of the specified test.
13/
The power density shall be measured over the frequency range 0.8 to 12.9 GHz at a distance of 1 meter from the tube in the three
principal planes for both horizontal and vertical polarization. The input signal level shall be the minimum required to saturate the
tube over the frequency range F1 to F3.
14/
Unless otherwise specified, the acceptance level for all tests listed under conformance inspection, part 1, shall be 1.0, (see 24/).
15/
The cathode current shall be measured at the optimum cathode voltage (label value) with a pi (rf) of 0.7 watt maximum, and shall
be such that the effective beam Z is within 4,987 to 5,513 ohms.
16/
The change in cathode current (Ćik) shall be the difference between ik1 and ik2 (corresponding to tk1 and tk2) and shall not exceed
the maximum specified.
17/
A swept-frequency technique may be used for this measurement at intervals not to exceed 20 MHz intervals.
18/
The gain variation (large signal) shall be the difference between the maximum gain and the minimum gain at the specified test
frequencies.
19/
The input of the tube shall be terminated with a matched load, and the output shall be connected to a +10 dB directional coupler.
The signal from the arm of the coupler shall pass through two filters connected in series (a high pass with a cutoff at 2.7 GHz and
a low pass with a cutoff at 3.3 GHz), into a crystal detector. The output of the coupler shall be connected through a 3-dB
attenuator to a variable-phase short circuit. The spurious power output shall be the maximum signal detected at the crystal as the
phase of the short is varied through the one-wave length at 3 GHz.
20/
The tube shall be stable when operating at the optimum voltage given on the test data sheet for the specific tube, and for all
cathode currents within ±5 percent of that cathode current shown on the data sheet. In addition, with an input VSW R of 1.5 or
less, the tube shall be capable of driving a mismatched load of 1.5:1.
4
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