MIL-PRF-1/1705C
TABLE I. Testing and inspection - Continued.
26/ First Article Inspection: The First Article sample furnished by the contractor/manufacturer shall consist of preproduction tubes in
the quantity indicated by table III of MIL-PRF-1. In addition, the contractor shall furnish along with the test reports written assurance
that:
a. The First Article sample is representative of the product to be furnished under the contract.
b. Production articles will be fabricated in the facility that produced the sample tubes.
c. Production articles will be fabricated from new materials.
The contractor shall furnish a test plan to the Contracting Officer for approval before proceeding with First Article inspection. The
test plan shall list all production test and laboratory test facilities to be used in First Article inspection and production phases of the
contract. Upon receipt of test plan approval, the contractor shall proceed with First Article inspection. First Article inspection shall
include all tests and requirements of this specification and conform to table I of MIL-PRF-1, where applicable. Upon conclusion of
First Article inspection, three copies of the test report (see MIL-HDBK-831 for guidance) and certified by the Government
Representative shall be forwarded along with the test samples to the Contracting Officer for approval.
27/ Frequency versus tuner dial divisions shall not deviate more than specified between F1 and F5 in figure 2 when tuning the tube dial
in either direction, except that when tuning in the counter-clockwise direction, tuning need not conform between F5-100 and F5.
28/ If these tests have been previously performed by the tube manufacturer, and if the material, manufacturing process, and test
requirements are the same as when the test(s) were performed, the subject test(s) need not be performed.
29/ The power stability life test shall be performed on a multi-pulsewidth line-type modulator containing a shunt overload relay circuit in
accordance with figure 5. The modulator shall be designed so that in the event the shunt overload circuit is activated, the modulator
and magnetron shall return to a "Standby" condition and "Operate" can be obtained only by manual reset. The test shall be
performed under test condition 1 at a frequency corresponding to the maximum power output within the specified frequency range,
F1 to F5, with a VSW R of 1.5 minimum located at a distance of 1 ± 0.05 meters from the magnetron flange. Phase shall be
adjusted under test condition 3 to that point throughout the test. Testing shall be in accordance with the test schedule below with
the change over from test condition 1 to test condition 3 being accomplished in no more than three (3) seconds and the heater
voltage changing directly from that specified in test condition 1 to that specified in test condition 3 during the switchover.
The test sequence shall be as follows:
Test Schedule
Test condition 1
Test condition 3
Running condition
Test condition
Cycle
Time (hr)
ib in amps
ib in amps
1
1.8 ± .2
25
30
2
1.8 ± .2
25
30
3
1.8 ± .2
25
30
4
1.8 ± .2
25
30
5
15.5 ± .5
25
30
At each switchover, the tube shall be operated in test condition 3 for 10 minutes before returning to test condition 1. Repeat cycles
1 to 5 inclusive until the specified life is attained. The time required to complete cycles 1 to 5 inclusive shall be 24 ± .5 hours.
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