Configuring the RF Signal
R&S
®
SMW200A
592User Manual 1175.6632.02 ─ 30
"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 900
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 898
:SENSe<ch>[:POWer]:FILTer:LENGth[:USER] on page 898
Auto Once ← Sensor Settings
Searches the optimum filter length for the current measurement conditions. The result
is indicated with the parameter Filter Length.
See also "About the measuring principle, averaging filter, filter length, and achieving
stable results" on page 586.
Remote command:
:SENSe<ch>[:POWer]:FILTer:SONCe on page 899
Noise/Signal Ratio ← Sensor Settings
For Filter > Fixed Noise, sets the noise content.
Remote command:
:SENSe<ch>[:POWer]:FILTer:NSRatio on page 899
Timeout ← Sensor Settings
For "Filter > Fixed Noise", sets a time limit for the averaging process.
Remote command:
:SENSe<ch>[:POWer]:FILTer:NSRatio:MTIMe on page 899
Default Aperture Time ← Sensor Settings
The sensor default setting is sufficient. Disable this parameter to specify a user-defined
aperture time per sensor, if, for example, the readings vary.
To obtain stable readings, set the Aperture Time exactly to one modulation period.
Remote command:
:SENSe<ch>[:POWer]:APERture:DEFault:STATe on page 896
Aperture Time ← Sensor Settings
If "Use Default Aperture Time > Off", defines the acquisition time per sensor.
Improving Level Performance
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