MIL-PRF-1/1677B
TABLE I. Testing and inspection - Continued.
1/
Refer to MIL-PRF-1, 3.4.5, "Absolute ratings".
2/
Temperature coefficient test procedure:
a.
Secure tube firmly with metal to metal contact to a section of standard waveguide at least 24 inches in length, ten (10)
inches of which shall be included in the temperature chamber.
b.
Close oven door and apply test voltages to the tube. Set the output frequency of the tube to approximately 16.0 GHz.
c.
Allow the tube to stabilize for approximately 30 minutes in still air at room temperature. At the end of 30 minutes, adjust
the reflector voltage to maximum power on Mode A and record frequency and temperature. Do not readjust the reflector
voltage at any time during the remainder of the test.
Adjust the oven to obtain an ambient temperature of approximately 105°C. Allow the tube to stabilize for 30 minutes in
d.
still air and record the frequency and the temperature.
e.
The temperature coefficient is the difference between the two frequency readings divided by the difference between the
two temperature readings.
3/
After the specified number of cycles of Mechanical Fatigue Test starting at 15.8 GHz to 16.2 GHz and returning to 15.8 GHz,
the tube shall pass the conformance inspection, part 1 requirement of the test specification.
4/
Apply heater voltage for one minute. Then apply other voltages plus the heater voltage for two minutes, and read the total
reflector current at the end of this two minute period.
5/
Reduce heater voltage from 6.3 volts to 5.7 volts. The percentage change in resonator current after one minute shall not
exceed the specified value.
6/
All oscillation tests are to be made with the tube rigidly connected to a UG-419/U cover flange on appropriate RG-91/U wave-
guide. The RF load shall have a maximum VSWR of 1.1 to 1.
7/
The reflector voltage is to be adjusted within the specified range for maximum power on mode A at the frequency specified.
Mode A can be found between Er = -100 V and -120 V.
8/
The tube is to be given 5 shocks at 70 g's and 6.5 milliseconds duration of sine pulse configuration in each of three mutually
perpendicular axes. The tube must be mounted securely to the waveguide flange. The frequency shift shall be read
following each shock, and the average shift resulting from five shocks shall not exceed the limit specified. The tube shall
meet all other conformance inspection, part 1 test conditions after completion of shock testing.
9/
The frequency shall be stabilized at a pressure of 70 mmHg. The pressure shall be increased to 760 mmHg with
uncontrolled temperature. The pressure change shall be complete and the frequency change measured within 10 seconds.
The frequency change shall not exceed the limit specified. The tube is to be fastened to a waveguide which is maintained at
atmospheric pressure during the test.
10/
The tube shall be vibrated at 10 g's at a frequency of 60 Hz for two minutes in three mutually perpendicular axes. The
reflector current bursts shall be recorded with an instrument whose frequency response is from direct current to 100 Hz with
no more than 3 dB fall-off at 100 Hz. There shall be no reflector current bursts greater than the limit specified.
11/
The tube shall be vibrated at 10 g's for five minutes in each of three mutually perpendicular axes over the frequency range
of 40 Hz to 500 Hz at logarithmic sweep, and shall require the time specified to traverse the range. The frequency
modulation and the change in power output, resulting from vibration shall not exceed the limits specified. The tube shall meet
all conformance inspection, part 1 tests following vibration. The total power output change shall not exceed 20 percent.
12/
Continuity shall exist between pins C and E and between pins A and C.
13/
Continuity shall not exist between any of the following:
A and H
C and D
D and H
4
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