Keysight Technologies C Series - 2-Port Transmission Measurements; How to make a 2-Port Transmission Measurement

Keysight N9915-90020 User’s Guide 619
VVM (Vector Voltmeter) Mode - Option 308
2-Port Transmission Measurements
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.
Figure 25-3 2-Port Transmission measurement of an amplifier
How to make a 2-Port Transmission Measurement
1. Press Mode then VVM then 2-Port Transmission.
2. Press Freq/Dist
and enter the measurement frequency.
3. Press Meas Setup 4
then More then Output Power. Select High for passive
devices. Select Low for amplifiers.
4. Calibrate the FieldFox using one of the methods described in “VVM
Calibration” on page 615. Before performing a Mechanical Cal, press Meas
Setup 4 then Zero OFF.
5. Connect the DUT.
Notes:
— The magnitude value is the gain (positive value) or the loss (negative value)
of the DUT.
— The phase value is the difference in phase (in degrees) between the DUT
input and output.
— To measure isolation of the amplifier, reverse the connection to the amplifier
(PORT 1 to the amplifier output).