Improving level performance
R&S
®
SMB100B
178User Manual 1178.3711.02 ─ 08
Remote command:
:SENSe<ch>[:POWer]:OFFSet on page 409
:SENSe<ch>[:POWer]:OFFSet:STATe on page 409
Filter ← Sensor settings
Selects the way the length of the used filter is defined.
See also "About the measuring principle, averaging filter, filter length, and achieving
stable results" on page 172.
"Auto"
Selects the filter length automatically and adjusts it to the measured
value. The value is indicated with the parameter Filter Length.
When high output power is applied, the filter length and therefore the
measurement time can be short.
When low output power is applied, the filter length and therefore the
measurement time is increased which reduces the considered noise
content in your measurement.
"User"
The filter length is defined manually, with the parameter Filter Length.
As the filter length works as a multiplier for the time window, constant
filter length results in a constant measurement time.
Values 1 and 2N are allowed.
"Fixed Noise"
The averaging factor is taken automatically in accordance to the
value Noise/Signal Ratio. Thus, the sensor's intrinsic noise (2 stan-
dard deviations) does not exceed the specified noise content.
To avoid long measurement times when the power is too low, set a
Timeout.
Timeout is the maximum acceptable measurement time which limits
the averaging factor and therefore leads to a more unstable readout.
Remote command:
:SENSe<ch>[:POWer]:FILTer:TYPE on page 408
Filter Length ← Sensor settings
Sets or indicates the filter length, depending on the selected filter mode.
●
"Filter > Auto" indicates the automatically adjusted filter length.
●
"Filter > User" enables you to set the filter length manually.
●
"Filter > Fixed Noise" hides the setting parameter.
Remote command:
:SENSe<ch>[:POWer]:FILTer:LENGth:AUTO? on page 406
:SENSe<ch>[:POWer]:FILTer:LENGth[:USER] on page 406
Noise/Signal Ratio ← Sensor settings
For Filter > Fixed Noise, sets the noise content.
Remote command:
:SENSe<ch>[:POWer]:FILTer:NSRatio on page 407
Auto Once ← Sensor settings
Searches the optimum filter length for the current measurement conditions. The result
is indicated with the parameter Filter Length.
Using power sensors
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