MIL-PRF-1/1037E
TABLE I. Testing and inspection - Continued.
15/ Test shall be made in cavity in accordance with Drawing 281-JAN. Calibrate the circuit by adjusting the cavity until the frequency of
resonance is 2.0 GHz H 5 MHz at room temperature, with a tube which meets the resonance test requirements. In the grid-
distortion test, the frequency shall first be measured with Ef = 6.3 volts, then the grid dissipation increased to 2 watts with Eb = -150
V dc. The change in frequency shall be not greater than the limit specified herein. Cooling air at room temperature may be used.
16/ Voltage shall be 60 Hz ac applied between anode and grid. No other voltages shall be applied. There shall be no evidence of
failure as indicated by an arc-over. Perform test on 10 tubes selected from the first production lot of each year. If more than one
tube fails, the test shall become a part of conformance inspection, part 2, with acceptance level 6.5, inspection level S3. After three
consecutive successful submissions the test shall revert to a 10-tube annual test. This is not a destructive test.
17/ The tube shall be mounted in socket in accordance with Drawing 276-Jan and vibrated with simple harmonic motion. The peak
acceleration over the frequency range shall be within H 20 percent of the reference acceleration at 100 Hz. The frequency shall vary
from 55 to 500 Hz and return to 55 Hz with approximately logarithmic progression and shall require 4 minutes minimum, 6 minutes
maximum to traverse the range. Each tube shall be vibrated through one complete sweep cycle in each position X and Z, except
that if the cumulative result of tests on 50 or more tubes of a construction show that more than 75 percent of the tubes have higher
output voltages in one position, subsequent measurements need to be taken only in the position giving the higher reading. The
voltages specified herein shall be applied to the tube during vibration. The value of the alternating voltage, Ep, produced across the
resistor, Rp, as a result of vibration shall be measured with a suitable device. This device shall have an appropriate voltage range,
shall have the ability to measure, with an error of less than 10 percent, the rms value of a sine wave of voltage at all frequencies
from 20 to 20,000 Hz.
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