MIL-PRF-1/1738D
TABLE I. Testing and inspection - Continued.
13/
The tube shall be vibrated in three axes, perpendicular to reference planes A, B, and C, figure 1, for a period of 1 minute in each
plane.
14/
At the completion of this test, the tube shall meet the power output, voltage, and tuner torque requirements of test condition 1 of
conformance inspection, part 1.
15/
Temperature measurements shall be made only after thermal equilibrium has been reached. The frequency shall be measured at
the extremes of any 30°C temperature range.
16/
The tube shall be subjected to five impact shocks along each of three axes perpendicular to reference planes A, B, and C (figure
1). Each shock pulse shall be half-sine shape, and have a duration of 11 ± 1 ms. The mounting plate of the tube shall be bolted
with brass bolts to the supporting fixture, and the shock pulse shall be measured on this fixture near the mounting plate.
17/
The salt solution concentration shall be 20 percent. The tuning mechanism may be completely cycled (cw and ccw) once prior to
measuring static torque. The tube shall meet the requirements of Conformance inspection, part 1, after salt spray.
18/
The waveguide output flange and the high-voltage input bushing shall be enclosed for the salt spray test.
19/
At the conclusion of this test, the tuner starting torque shall not exceed 14 inch-ounces.
20/
Unless otherwise specified, the acceptance level for all tests listed under Conformance inspection, part 1, shall be 1.0.
This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III.
21/
After a holding period of 48 hours, the anode voltage shall be applied 150 seconds minimum after the application of the standby
heater voltage. The missing pulse count test interval of 3 minutes shall start immediately after the application of anode voltage.
22/
The frequency range F1 to F3 shall be traversed by a tuning shaft rotation of 160 ± 4 turns. A mechanical over-run of 3 turns
minimum shall be provided at each end of the tuning range before contacting the mechanical stops.
23/
The frequency shall be the frequency of minimum power output between F1 and F3.
24/
The pushing factor shall be measured in a 4 ampere step, 24 A to 28 A, and shall not exceed the limits specified herein. The peak
current through the tube shall alternately be the limits as specified under this test condition. These tests shall be run to exclude
the effects of thermal drift and frequency not due to pushing.
25/
The frequency obtained by tuning to a given angular position in one direction shall be reproducible within the specified limits when
returning to that same position from the opposite direction after thermal equilibrium.
26/
The life test shall be conducted while the phase of a 1.5:1 minimum VSW R is cycled through 180 electrical degrees minimum,
approximately every 15 minutes. Simultaneously the tube frequency shall be cycled, or changed in 150 MHz increments, each 50
hours to insure approximately equal operating time over the entire frequency range from F1 to F3. After the required standby
condition, the following test cycle shall apply:
Condition
Ib (mA dc)
Ef (V)
Duration (minutes)
Standby
0
13.75
10
Test condition 1
11
9.0
110
NOTE: The accumulated time shall include both high voltage and standby time.
27/
At each of the dial settings and under the operating conditions specified in 8/, the measured frequency shall not differ from the
stated frequency by more than the amount specified when tuning is performed in the order of increasing the frequency.
28/
Each magnetron shall be tested at an RF output of 300 kW at 9.0 GHz with a pulse width of 0.3 µs, at duty cycles of 0.0003 and
0.0004. The magnetron shall be marked as follows:
Ib (mA dc)
Duty cycle
0.0003
---
0.0004
---
5
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business