R&S
®
CMW 500 GPRF Applications
GPRF Measurements and Generators
Operating Manual 1202.3986.32 – 03 142
External Power Sensor Configuration
The statistical settings (Control) define the number of power results requested from the
power sensor. An attenuation value corrects the power reading of the external power
sensor.
7.1.3.3 Zeroing
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 (see tips below!). R&S power sensors automatically 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 sensor model; refer to
the documentation of your external power sensor for more information.
Tips for zeroing
Repeat 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 very 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; do not disconnect it from the power
sensor. In this way you will maintain the thermal equilibrium, and zeroing will also
compensate for the noise superimposed on the measured signal (e.g. from a
broadband amplifier).
A reset of the R&S CMW 500 does not affect the last zeroing result.
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