Configuring the Signal in the RF Domain
R&S
®
SMW200A
549User Manual 1175.6632.02 ─ 16
"Auto"
The filter length is selected automatically and adjusted to the mea-
sured value. The value is indicated with the parameter Filter Length
With high signals, the filter length and therefore the measurement
time can be short.
With low signal levels, the filter length and therefore the measure-
ment time is increased to reduce noise.
"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 selected so that the sensor's intrinsic noise (2
standard deviations) does not exceed the specified noise content.
Set the noise content value with the parameter Noise/Signal Ratio.
To avoid long settling times when the power is low, limit the averag-
ing factor with the parameter Timeout.
Remote command:
:SENSe<ch>[:POWer]:FILTer:TYPE on page 821
Filter Length ← Sensor Settings
For "Filter > Auto or User", indicates the used filter length.
Remote command:
:SENSe<ch>[:POWer]:FILTer:LENGth:AUTO? on page 819
:SENSe<ch>[:POWer]:FILTer:LENGth[:USER] on page 820
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 543.
Remote command:
:SENSe<ch>[:POWer]:FILTer:SONCe on page 821
Noise/Signal Ratio ← Sensor Settings
For "Filter > Fixed Noise", sets the noise content.
Remote command:
:SENSe<ch>[:POWer]:FILTer:NSRatio on page 820
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 821
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.
Improving Level Performance
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