MIL-PRF-1/507H
NOTES - Continued.
30
Although all tests in Part 3, Periodic check, herein may be performed in any sequence, the sequence recommended is as follows:
Air cooling
Input capacitance
Frequency
Temperature coefficient
Low pressure
Low-temperature operation
Shock
Salt spray (corrosion)
Humidity
However, at option of the manufacturer, the tube sample(s) may be subjected to the Part 3, Periodic Check tests herein in
accordance with the following grouping plan (see c, below):
a.
The tube sample(s) shall be subjected first to all tests in Group 1, then to all tests in Group 2, and in the test sequence shown
within each group. The requirements of Note 29 above shall be effective for performance immediately after the last test in each
group.
b.
Group 1
Group 2
Air cooling
Low-temperature operation
Input capacitance
Shock
Low pressure
Salt-spray (corrosion)
Frequency
Humidity
Temperature coefficient
c.
The above grouping plan is provided to relieve the need to repeat pre- and post-test end-point measurements (all tests of
Conformance Inspection, part 1 herein) normally pertinent to individual tests such as Shock and Humidity.
31
The magnetron shall be mounted on a test plate and subjected to five half-sine shock pulses in each of three mutually
perpendicular axes (a total of is shock pulse) parallel to the respective reference planes shown in Fig. 1 herein.
Under specified pressurization and with load phase varied through .5 λ g, (waveguide), minimum, there shall be no evidence of
32
breakdown in input assembly.
The output frequency of the electron tube shall be within the specified limits when the anode-block temperature is varied from +55°
33
to +85° C.
ĆT is the temperature rise of the anode above that of the coolant temperature at inlet of the cooling fins with the airflow as
34
specified.
35
This specification sheet uses accept on zero defect sampling plan in accordance with MIL-PRF-1, table III.
7
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