Instrument Function
R&S
®
SMU200A
213Operating Manual 1007.9845.32 ─ 15
Unit - Power Sensors
Selects the unit used for result display.
The power sensor provides the measured value in Watt.
In which unit the measured value is indicated is selected here and might be Watt, dBm
or dBuV.
SCPI command:
SENSe<ch>:UNIT[:POWer] on page 565
Permanent Display State - Power Sensors
Activates the permanent indication of the power measurement result in the upper right
corner of the block diagram. For each sensor, the type of sensor, the connector, the
measurement source and - if set - the offset is indicated.
SCPI command:
SENSe<ch>[:POWer]:DISPlay:PERManent:STATe on page 559
Permanent Display Priority - Power Sensors
Selects whether the average or the peak power measurement result is indicated when
permanent display is active.
SCPI command:
SENSe<ch>[:POWer]:DISPlay:PERManent:PRIority on page 559
Zero - Power Sensors
Activates the auto zero function.
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
Zeroing should be performed:
●
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 sen-
sor. In this way you will maintain the thermal equilibrium, and zeroing will also com-
pensate for the noise superimposed on the measured signal (e.g. from a broadband
amplifier).
SCPI command:
SENSe<ch>[:POWer]:ZERO on page 565
RF Signal and Analog Modulations - RF Block
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