Configuring the RF Signal
R&S
®
SMBV100B
397
User Manual 1178.4460.02 ─ 03
Zeroing calibrates the external power sensor by adjusting its reading at zero signal
power. For this purpose, the RF power source must be switched off or disconnected
from the sensor. If a Rohde
&
Schwarz power sensor receives an input power during
the zeroing process, it aborts zeroing and generates an error message. Zeroing takes
a few seconds, depending on the sensor model. Refer to the documentation of your
power sensor for more information.
Tips for zeroing
When to perform zeroing:
●
During warm up after switching on or connecting the instrument
●
After a substantial change of the ambient temperature
●
After fastening the power sensor module 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.
●
Switch off the RF power source for zeroing, but do not disconnect it from the power
sensor. This proceeding keeps the thermal equilibrium, and the zeroing process
also compensates the noise that superimposes the measured signal (e.g. from a
broadband amplifier).
Related settings and functions
●
Measurements-related settings, like results, filter, filter length:
●
Software version of the connected power sensor:
●
Assignment of the external signals and the output connectors:
Chapter 10.2.4, "RF Connectors Settings"
●
Acquisition of level correction data:
Chapter 6.12.3, "User Correction"
Additional information
See Rohde
&
in section "Power
Meters & Voltmeters" for:
●
R&S NRP power sensor manual.
●
Information on the R&S NRP-Z5 sensor hub and the available accessories.
●
Sensor software updates.
NRP Power Viewer Settings
Access:
► Select "RF" > "RF Measurement" > "NRP Power Viewer".
Improving Level Performance
