MIL-E-1/1315E
TABLE I. Testing and inspection - continued
NOTES:
1.
The magnetron shall be mounted on a test plate and shocked 10 times on each mutually perpendicular axis
parallel to the reference planes shown in figure 1. The shock pulse shall have a duration of approximately 11
ms as measured at the quarter amplitude points of the acceleration shock wave.
2.
The maximum value specified is for a non-oscillating condition. Heater-surge current shall not exceed 100
amperes.
3.
Specifications for heater operation shall be supplied with each tube. The preheat and operate voltage shall be
indicated on the magnet of the tube.
4.
Frequency skipping or unstable operation may be encountered at some phase positions when the mismatch
occurs at the end of a "long" line.
5.
Temperatures shall be measured at the points indicated on figure 1.
6.
During operation, the gas used in pressurization shall provide insulating properties at least equal to that of
clean-dry air at the pressure indicated.
7.
During operation the high voltage bushing shall be immersed in a liquid insulating medium with properties
equivalent to Esso Univolt 35 oil.
ΔT shall be the temperature rise of the anode above that of the coolant temperature at the inlet. ΔP shall be
8.
the pressure drop across the anode coolant jacket.
9.
The tube shall be mounted with the cathode vertical within ± 15° during test.
10.
The frequency shall be varied between F1, F2, and F3 at eight hour intervals during the life test. Power input
to the tube during the life test shall be cycled according to the following schedule:
Preheat:
10 minutes ± 10%
Oscillate:
7.5 hours ± 10%
All voltages off:
20 minutes ± 10%
11.
This test shall be conducted at room temperature (approximate 25°C).
12.
The tuner drive mechanism shall not be "set" against either mechanical stop.
13.
The tuner mechanism shall be cycled at a rate of approximately 1 cycle per minute (cpm) between 1 and 36
turns, measured clockwise from the mechanical stop. The turns shall be counted at the point of drive.
14.
Performance of these tests is required when First Article Testing is required by the contract.
15.
Typical pulse characteristics for power output are as follows:
VSWR=1.1:1, unless otherwise specified.
trc:
.25 µs (measured 20 to 85%)
tfc:
1.5 µx (measured 0 to 85%)
trv:
.55 µs (measured 20 to 85%)
tfv:
3.0 µs (measured 0 to 85%)
Spike or ripple:
± 5%
Inverse voltage:
12%
Post pulse:
0%
Voltage or current spike, ripple, inverse, and post pulse oscillation must be at a minimum.
3
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