R&S ZNA26 - Page 325

GUI reference
R&S
®
ZNA
325User Manual 1178.6462.02 ─ 20
Figure 5-3: NF Setup dialog: frequency-converting
Driving Port (RF) / Receiving Port (IF)
Allows you to select the driving port (the RF port for frequency-converting DUTs) and
the receiving port (the IF port) for the noise figure measurement. It is recommended to
us a driving port which is equipped with a source step attenuator to suppress to inter-
nal noise of the VNA.
Remote command:
[SENSe<Ch>:]NFIGure:DEFine
Source Attenuator
For a precise noise figure measurement, it is necessary to suppress to internal noise of
the VNA. To this end, set the source step attenuator to a value of at least 40 dB.
Remote command:
See "Source Step Att." on page 477.
Combiner Port
If an internal or external combiner is used to create a two-tone signal, it is necessary
that not only the driving port, but also the port generating the second tone uses a
source step attenuatior of at least 40 dB.
Remote command:
See "Source Step Att." on page 477.
Meas softtool