Instrument Function
R&S
®
SMB100A
133Operating Manual 1407.0806.32 ─ 13
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).
Remote command:
:SENSe<ch>[:POWer]:ZERO on page 287
Target Level
Specifies the nominal level expected at the input of the sensor. The signal generator
adjusts the output power accordingly, in order to meet the target value at the sensor input,
and thus the power required at the DUT.
Remote command:
[:SOURce<hw>]:POWer:SPC:TARGet on page 347
Limit - RF Level
Sets an upper limit for the RF output power.
You can use it to protect your DUT from damage due to high input power. If you enter an
RF level above this value, the instrument limits the output power to this specified value,
and generates a warning message.
However, the level indication in the status bar is not affected.
Note: The limit value is always effective, regardless of whether you work with "NRP-Z
Power Control" or not.
The value is not affected by an instrument preset (PRESET key), *RST and the "Save/
Recall" function. It is influenced only by the Factory Preset and the factory value is equal
to maximum level.
Remote command:
[:SOURce<hw>]:POWer:LIMit[:AMPLitude] on page 343
Catch Range +/-
Sets the capture range of the control system.
Within the range:
Target Level +/- Catch Range
the power control locks and tries to achieve the target level. Readings outside the range
are not considered.
Remote command:
[:SOURce<hw>]:POWer:SPC:CRANge on page 346
RF Block
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