Instrument Function
R&S
®
SMB100A
144Operating Manual 1407.0806.32 ─ 13
Level (Avg.) - Power Sensors
Indicates the measured level value with the selected unit.
Remote command:
:READ<ch>[:POWer]? on page 279
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.
Remote command:
:SENSe<ch>:UNIT[:POWer] on page 287
Permanent Display State - Power Sensors
Activates the permanent indication of the power measurement result in the upper right
corner of the block diagram. The instrument shows the type of sensor, the corresponding
connector, the measurement source and - if set - the offset.
It is possible to switch the permanent display active for several sensors. In this case, the
instrument indicates the values of the sensor with the lowest port number in the display.
Remote command:
:SENSe<ch>[:POWer]:DISPlay:PERManent:STATe on page 280
Display Priority - Power Sensors
Determines which power measurment result is indicated in the permanent display. If the
NRP-Zxxx power sensor can measure peak power, the peak power is displayed by
default, if not, the instrument automatically indicates the average power.
Remote command:
:SENSe<ch>[:POWer]:DISPlay:PERManent:PRIority on page 281
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
RF Block
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