MIL-PRF-1/1734C
TABLE I. Testing and inspection - Continued.
Method
Limits
Inspection
Unit
Test
Symbol
Conditions
MIL-STD-1311
Min
Max
Conformance inspection,
part 3
Group D; 11/
hours
Life test
---
2
t
500
---
Life test end points:
Power output
4250
2
Po
43
---
W
Pulse stability
4315
2
MP
---
0.5
%
ĆF
Vibration, mechanical
1032
7/
2
---
0.5
MHz
Shock
1042
8/
2
---
---
---
---
ĆF
Temperature
4027
2/
2
---
0.4
MHz
ĆT
°C
1/
Prior to the application of high voltage, the cathode shall be heated to the required initial operating temperature.
This may be done by applying 12.5 volts ± 5 percent for three minutes. On the application of anode power, the
heater voltage should be lowered to the voltage specified, and for various power inputs, it should be adjusted
within ±0.5 V ac, according to the following formula:
Ef = 12.5 - 0.0232 (Pi)
The tube heater may be protected against arcing by use of a connector that places a minimum capacitance of
4,000 pF across the heater directly at the input terminals.
2/
The temperature is to be measured at the point indicated on the outline drawing.
The mechanical design of the mounting plate shall provide for cathode terminal pressurization of 25 ± 2 pounds-
3/
force per square inch gauge and leak rate not to exceed 0.1 standard cubic inch per minute. The surface of the
output flange shall be capable of pressurization with an "O" ring in the mating flange.
The cathode terminals shall operate in air pressurized to at least 12 pounds-force per square inch. The output
window shall operate in air pressurized to at least 20 pounds-force per square inch when the output mismatch is
higher than 1.3 VSWR or 15 pounds-force per square inch when the output mismatch is less than 1.3 VSWR.
The magnetron may receive forced air cooling, to keep it within the temperature rating during test.
The rate of rise of voltage (rrv) shall be expressed in kilovolts (kV) per microsecond (µs) defined by the steepest
4/
tangent to the leading edge of the voltage pulse above 50 percent amplitude. Any capacitance used in viewing
shall not exceed 6.0 pF. The minimum value for test shall be the maximum value of rrv for equipment use.
A missing RF pulse is defined as an RF pulse whose energy content (integrated power) within a ±1 percent
5/
frequency range of the normal operating frequency is 70 percent or less than that of a normal pulse. The
measurement shall be made during any three minute interval of a six minute test period.
3
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