Instrument Function
R&S
®
SMC100A
154Operating Manual 1411.4060.32 ─ 09
"User"
The filter length is set manually.
The filter length is entered in the entry window to the right. As the fil-
ter length works as a multiplier for the time window, this results in a
constant measurement time.
Note: The time window varies depending on the used sensor. For
most sensors it is fixed to 20 ms. For the R&S NRP-Z81 sensor it is
10 us. Therefore, the user filter length for the R&S NRP-Z81 has be
about 1000 times larger than the filter length for other sensors in
order to achieve the same filtering result.
The Auto Once button can be used to search for the optimum filter
length for the current measurement conditions. The found filter length
is indicated in the field to the right, see Filter Length.
"Fixed Noise"
The averaging factor is selected so that the sensors intrinsic noise (2
standard deviations) does not exceed the specified noise content.
The desired noise content is entered in the entry field to the right, see
Noise Content.
To avoid very long settling times when the power is low, the averag-
ing factor can be limited with the Timeout parameter.
Remote command:
:SENSe<ch>[:POWer]:FILTer:TYPE on page 273
Filter Length ← Filter
Indicates the used filter length for filter type "Auto" or "User".
Remote command:
:SENSe<ch>[:POWer]:FILTer:LENGth:AUTO? on page 271
:SENSe<ch>[:POWer]:FILTer:LENGth[:USER] on page 271
Noise Content ← Filter
Sets the noise content for filter type "Fixed Noise".
Remote command:
:SENSe<ch>[:POWer]:FILTer:NSRatio on page 272
Timeout ← Filter
Sets a time limit for the averaging process.
Remote command:
:SENSe<ch>[:POWer]:FILTer:NSRatio:MTIMe on page 272
Auto Once ← Filter
Calculates the optimum filter length for the current measurement conditions and indi-
cates the value in the Filter Length.
Remote command:
:SENSe<ch>[:POWer]:FILTer:SONCe on page 273
Use Default Aperture Time
Enables you to specify a user-defined aperture time for the respective sensor.
RF Block
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