MIL-PRF-1/1112H
TABLE I. Testing and inspection - Continued.
16/ Spectrum test:
a.
The requirements of b. shall be met under the following conditions: (1) a suitable grid drive pulse such as shown on
figure 2; (2) an output voltage pulse of 3.5 μs when measured at half amplitude; (3) a peak drive voltage set at a point in
the range 365 ± 55 volts with reference to the bias level of -125 volts dc; (4) the input and center cavities suitably
detuned as described in the spectrum check; and (5) peak power output of at least 11.5 kw.
b.
The frequency spectrum of the output rf pulses shall be such that the energy in each 500 kHz wide band, centered ±800
kHz from the center frequency shall be greater than 43 dB down from the energy in the 500 kHz band centered on the
carrier frequency; further, the energy in each 500 kHz wide band, centered ± 2 MHz from the center frequency shall be
greater than 53 dB down from the energy in the 500 kHz band centered on the carrier frequency.
17/
The beam current shall be measured at 0, 24, 48, 250 and 500 hours. Power output shall be measured only at 0, 48, 250,
and 500 hours. Average power may be adjusted by means of variable pulse repetition rate and grid voltage.
18/
The second harmonic of the fundamental drive frequency shall be below the limit specified herein when the output of the tube
is examined under Po conditions by spectrum analyzer techniques at the drive frequencies of F1, F2, and F3.
19/
The tube shall be vibrated at 15 and 135 Hz for 3 minutes at each frequency. The vibration level shall be 2.5 G''s and shall be
applied in the Z-direction. Before and after this test, the TUT shall satisfy the requirements of conformance inspection, part 1.
20/
The TUT shall be installed in a temperature chamber with external rf connections provided from each cavity. The body
temperature coefficient is measured by tuning each tube cavity to resonate with the modulated output of a signal source
operating at the specified frequency. Absorption of each cavity and a monitoring frequency meter are viewed superimposed
on an oscilloscope presentation of the mode. The frequency of each cavity is measured at room ambient temperature and at
the specific temperature extremes. The temperature coefficient ĆF shall be within the specified limit.
ĆT
21/
The TUT shall be shocked with 3 shock pulses in each of the +X, +Y, and +Z axes of the tube. The TUT shall then satisfy the
requirements of the conformance inspection, part 1, power output test.
22/
The TUT shall be mounted in a shock-mounted rack resonant at 35 ±5 Hz at normal vibration amplitude (less than 0.100
displacement). This platform shall exhibit these frequency characteristics in all directions of applied shock. The deflection
characteristics of this shock-mounted rack shall be the same as, or similar to, that of Barry Corporation Shock Mounts, Type
C-2080-T6-SB, or equivalent.
23/
The resonant frequency of each resonator shall be set at F2 ±2 MHz by "cold test" methods. After vibration, the cold resonant
frequency of the respective resonators shall be within the limits specified herein of the original setting.
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