Concepts and features
R&S
®
ZNA
289User Manual 1178.6462.02 ─ 20
When configuring the PM4 in the External Power Meters dialog, the "Raw Serial" inter-
face must be used, and the related COM port ("COM87" in our example) must be
entered as "Address" parameter.
Ranging
For power meters PMx, setting the power range remotely is not supported by the
R&S ZNA firmware.
Adjust the range switch of the PMx so that the maximum RF output power of the fre-
quency converter is within the selected power range. See the data sheet of the related
converter type and the suitable PMx manual for details.
Zeroing
To increase calibration accuracy – in particular for low measurement ranges – zeroing
the PMx power meter is recommended. Zeroing is also recommended before a refer-
ence receiver calibration.
After mounting the sensor head to the frequency converter, allow sufficient thermal set-
tling time (1 hour is recommended). After the system has reached thermal equilibrium,
switch off the converter’s RF output power by selecting Channel – [Pwr Bw Avg] >
"Power" > "RF Off All Chanels" on the R&S ZNA. Press the [ZERO] button on the front
panel of the PMx. After that, reactivate the converter’s output power by deselecting
"RF Off All Chanels".
For the PM5, zeroing can also be done from the analyzer GUI (Trace – [Meas] >
"Power Sensor" > "Auto Zero". For the PM4, "Auto Zero" is not supported.
Optional extensions and accessories
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