MIL-STD-220 Method Of Insertion Loss MeasurementThis standard covers a method of measuring, in a 50 ohm system, the insertion loss of feed-through suppression capacitors, and of single and multiple circuit radio frequency RF filters at frequencies up to 10 gigahertz GHz.

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MIL-STD-220C

APPENDIX A

Figure A-3 represents the filter performance if there is an issue with the shell to fixture grounding. Similar measurements would be expected if there is an issue with the shell plating or any other issue affecting grounding to the connector shell.  The insertion loss of both pin to shell and pin to adjacent pin measurements will show similarly as very low loss as frequency increases.  A measurement of the pin to test fixture will show high loss and is similar to a pin to shell measurement when the shell is properly grounded.

FIGURE A-3.  Insertion loss poor filter and fixture ground.

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