R&S ZNB Series User Manual page 266

®
R&S ZNB/ZNBT
External power meters must be configured with their connection type and device
address before they are available as additional receivers (System – [Setup] > "External
Devices" > "Power Meters"). Configured power meters appear in many control ele-
ments of the R&S ZNB/ZNBT, e.g. in the port configuration and in the power calibration
dialogs.
4.7.27.1 Zeroing
Zeroing calibrates the external power meter by adjusting its reading at zero signal
power. For this purpose, the RF cable between the analyzer and the power sensor
must be disconnected (see tips below!). R&S power sensors and power meters auto-
matically detect the presence of any significant input power. This aborts zeroing and
generates an error message. Zeroing can take a few seconds, depending on the power
meter model; refer to the documentation of your external power meter for more infor-
mation.
Repeat zeroing
●
During warm-up after switching on or connecting the instrument
●
After a substantial change of the ambient temperature
●
After fastening the power meter to an RF connector at high temperature
●
After several hours of operation
●
When low-power signals are to be measured, e.g. less than 10 dB above the lower
measurement limit.
A reset of the network analyzer does not affect the last zeroing result.
User Manual 1173.9163.02 ─ 62
1
From VNA
source port
Power calibration plane
Optional extensions and accessories
VNA
USB ports
2
Power meter / sensor
Concepts and features
Control connection
(e.g. USB)
266