Agilent Technologies FieldFox N9923A User Manual page 75

A/B and B/A Measurements
These measurements allow you to use the FieldFox A and B receivers, along with
an external source, to make ratioed measurements. You would do this if your
measurement requires the use of an external source.
The following image shows a typical configuration for a B/A magnitude and
phase measurement of a 2-port DUT. This DUT can be an antenna / probe setup.
Using network analyzer terms, the image shows the A receiver as the reference
receiver which measures the signal that is applied to the DUT. The B receiver is
the test port receiver which measures the DUT response.
To calibrate for this measurement, replace the DUT with a THRU connection,
preferably by connecting together two Power Splitters (shown in green below).
For low frequency measurements, TEEs can be used.
Then press Zero.
B/A Transmission measurement with external source
VVM (Vector Voltmeter) Mode 75