Keysight N9923A FieldFox User Manual page 108

11. Carefully trim the cable until the phase shift reads zero. The attached cable's
12. Repeat steps 9 through 11 for the remaining cables to be trimmed.
2-Port Transmission Measurements
A 2-Port Transmission measurement is used for measuring electrical length, insertion
loss, gain, or isolation of a DUT at a single CW frequency. The FieldFox signal source
is transmitted out the port 1 connector, through the DUT, and into the port 2
connector. In the following image, the gain of an amplifier is being measured.
2-Port Transmission measurement of an amplifier
How to make a 2-Port Transmission Measurement
1. Press Mode then
2. Press Freq/Dist and enter the measurement frequency.
3. Calibrate the FieldFox using one of the methods described on page 106. Before
4. Connect the DUT.
Notes:
 The magnitude value is the gain (positive value) or the loss (negative value) of the
 The phase value is the difference in phase (in degrees) between the DUT input and
 To measure isolation of the amplifier, reverse the connection to the amplifier
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.
NOTE These measurements require the "Full 2-port S-parameters" option.
The image below 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.
108
electrical length is now matched to the reference cable.
VVM
performing a QuickCal or Mechanical Cal, press Meas Setup 4 then
OFF.
DUT.
output.
(PORT 1 to the amplifier output).
then
2-Port Transmission.
Zero
FieldFox User's Guide