MIL-STD-220C
5. METHOD OF TEST
5.1 Test conditions. Unless otherwise specified in the individual component specification, all measurements shall be made at room ambient temperature, atmospheric pressure, and relative humidity.
5.2 Test procedure.
5.2.1 Preliminary operation. To insure stability, each network/spectrum analyzer shall be operated for a period of at least 30 minutes immediately before measurement.
5.2.2 Method of measurement. The insertion loss of the component under the specified conditions and at the frequency of measurement may then be expressed in dB when testing is conducted with a network/spectrum analyzer; insertion loss is read directly from the instrument display.
5.2.2.1 Measurement procedure:
a. The fixture shall be capable of measuring insertion loss to 1 GHz.
b. The fixture will be closed using the bulkhead without the connector installed so that there is an opening between the input and output side of the enclosure.
c. The input and output probes will be connected together through the opening and the network analyzer "zeroed" through the frequency range of interest.
d. The connector will be installed to the bulkhead and the fixture will be enclosed, and
e. By movement of the input and output probes to each contact, the insertion loss shall be measured to verify a minimum or recorded for a data report.
The fixture with the connector installed shall be proof tested to insure the filter grounding is correct so that the actual filter performance is displayed. In the preparation of a test setup prior to measuring insertion loss, the measurement of the pin through, pin to adjacent pin, and pin to shell insertion loss can be used
to verify the cables, shielded enclosure, and internal grounds of the DUT, see appendix for details.
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