MIL-PRF-1/1734C
TABLE I. Testing and inspection - Continued.
6/
The magnetron will be operated both intermittently and continuously at relative humidities up to and including
100 percent at temperatures up to 71°C including those conditions wherein condensation takes place on
magnetron.
7/
The magnetron shall be supported on normal mount plate, and subjected to the specified vibration in each of
the three (3) orthogonal axes. The performance of the magnetron shall be monitored, and the points of
maximum deviation of performance and/or resonances shall be individually tested for a period of 30 minutes
each. The total vibration time in each axis shall be three hours. The total cycling time will depend upon the
number of resonances, but will not be less than one hour. The maximum ĆF measured at the resonances shall
be 0.5 MHz. See figure 1.
8/
The magnetron shall be capable of specified performance subsequent to the following shock tests:
Under normal conditions, the magnetron will be subjected to 18 impact shocks of 15 g each, consisting of three
shocks each in opposite directions along each of three (3) orthogonal axes, each shock impulse being a half
sine wave of 11 ± 1 milliseconds time duration. The g value shall be within ±10 percent when measured with a
250 Hz low pass filter, and the maximum g shall occur at approximately 5.5 milliseconds.
The magnetron under normal mounting conditions shall be subjected to 12 impact shocks of 30 g, consisting of
two shocks in opposite directions along each of three (3) orthogonal axes. Each shock impulse shall have a
time duration of 11 ± 1 milliseconds, and the g value shall be within ±10 percent when measured with a 250 Hz
low pass filter. The maximum g value shall occur at approximately 5.5 milliseconds.
9/
With the magnetron properly mounted on a suitable heat sink and with 20 cubic feet per minute air flowing
around the body, the peak temperature shall not exceed the maximum rating. The anode temperature shall be
measured at that point on the anode block specified in the outline drawing. The input terminal temperature shall
be determined at that point specified on the outline drawing.
10/
Reclaimed materials shall be utilized to the maximum extent possible.
11/
Cycle tests of 30 minutes ON preceded by three minutes maximum filament schedule and followed by 27
minutes OFF shall be made until the total accumulated ON time equals the specified life.
During the ON periods, a VSWR of 1.5:1 maximum shall be introduced into the external load circuit and the
phase shall be automatically adjusted at least four times during each ON period to include those points of
maximum and minimum power and frequency.
Cooling during ON and OFF periods shall be adjusted so that:
a. The anode block temperature during the ON cycle approaches but does not exceed the maximum rating
(however no heat source will be required to force temperature above the value resulting from zero air flow).
b. The anode block temperature at termination of the OFF cycle shall be no higher than room temperature
plus 20°C (Both OFF time and air quantity may be adjusted.)
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