MIL-PRF-1/781F
TABLE I. Requirements or tests - Continued.
NOTES:
1. Voltage measured across specified grid resistor.
2. The tube shall be placed in the circuit shown (see figure 1) in a constant magnetic field of 375 ± 10 percent gausses
perpendicular to the normal electron path. The direction of the magnetic field shall be such as to deflect the electron beam
toward the top of the tube (north pole of magnet at pin No. 7). The noise voltage measured at the output of the 1,000 Hz
bandwidth filter shall not be less than the limits specified below for the various specified frequencies:
Minimum noise voltage,
µV rms
Frequency, MHz
0.1
10,000
0.2
14,000
0.5
25,000
1.0
22,000
2.0
7,000
5.0
500
10.0
70
3. The tube shall be placed in the circuit shown (see figure 2) in a constant magnetic field of 375 ± 20 percent gausses which is
perpendicular to the normal electron path. The direction of the magnetic field shall be such as to deflect the electron beam
toward the top of the tube. The noise voltage measured at the anode of the tube and across the output of the circuit shall not
be less than the specified limit in peak-to-peak volts. The oscilloscope used for noise amplitude measurement shall have a
3 dB video bandwidth extending to at least 4 MHz.
4. This test shall be the first test performed at the conclusion of the holding period.
5. This test shall be performed according to the life testing schedule given in MIL-PRF-1 paragraph 4.3.8.
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