ETS-Lindgren 95242-1 Injection Probes - Manual (Page 26)

26 | Insertion Loss
Procedure
1. Connect the signal generator output directly to the RF voltmeter input
as show in Typical Reference Calibration Setup on page 25, indicated
by the dashed line. Use the same cables which connected the
calibration jig and the injection probe under test. Tune to the test
frequency and adjust the signal level for a reference of 0 dBm
indication on the RF voltmeter.
2. Without changing control settings, connect the signal generator output
to the bulk current injection probe input and connect the calibration jig
connector to the RF voltmeter input.
3. Note the RF voltmeter output in dB. The difference between this
reading and 0 dB is the insertion loss. In this measurement, the loss
cannot be less than 3 dB since half the injected power is absorbed by
the 50 ohm termination that is particularly loading (50%) the
calibration jig.