MIL-PRF-1/1112H
TABLE I. Testing and inspection - Continued.
Inspection
Method
Notes
Conditions
Symbol
Unit
Limits
MIL-STD-1311
Min
Max
Qualification tests -
Continued
+0.015
MHz/°C
ΔF/ΔT
Temperature coefficient
4027
20/
F = F2; TA = -65°C to +65°V
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-0.021
MHz/°C
Shock, specified pulse
1042
21/ 22/
Test condition J, except 6.5 ms
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ΔF
Nonoperation vibration
1031
23/
No voltages
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0.5
MHz
ĆV (max)
Operation vibration
1031
19/
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3.0
%
V (max)
Permanence of marking
1105
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1/
The tube described herein shall be designed to be mounted in any position using the four .375 inch (9.53 mm) diameter
threaded inserts on the collector end plate and a suitable strap around the mounting bracket shown on figure 1.
2/
The tube under test (TUT) shall be cooled at sea level pressure with 18 psia per minute of 0.0730 pounds per cubic foot
density at a pressure drop not greater than 2.0 inches of water.
3/
The TUT shall stabilize within the limits specified herein after a 5 minute (maximum) preheating period.
4/
The TUT shall not be operated without a negative-grid bias when the beam voltage has been applied. The TUT shall be
protected from this condition by overload circuits included in the high voltage circuits. The output of the dc beam supply shall
be followed by a series resistor approximately 10 ohms to prevent serious surges of beam current through the tube.
5/
The following procedure shall be followed for all new tubes and tubes which have not been operated during the preceding
3-month period.
a.
Reduce the grid drive voltage to zero (do not change the bias voltage from its normal -125 V setting).
b.
Turn on main power and apply rated filament and 125 V bias voltage for 15 minutes.
c.
Apply a beam voltage of 7 kv for 15 minutes.
d.
Increase the grid drive from zero to a value which gives 10 ma of average beam current.
e.
Apply the rated beam voltage and increase the grid drive to 60 mA average beam current. Continue to increase the grid
drive to values which provide 10 mA beam current increases every 5 minutes until the current reaches 90 mA and
operates at 90 mA for 5 minutes.
The tube is not considered to be properly aged and ready to be placed into service.
6/
The control grid shall be driven with a shaped pulsed pair which has a peak amplitude as specified herein with reference to
the negative bias voltage (total grid swing).
3
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