Instrument Function
R&S
®
SMU200A
215Operating Manual 1007.9845.32 ─ 15
The filter length can be selected automatically or can be manually set to a fixed value.
As a preliminary, you should always check if the auto mode is giving satisfactory results
because you will always have to adjust an optimal, manual filter-length setting if the power
is not constant.
Selection "Fixed Noise" is offered for reaching defined measurement accuracy.
"Auto"
The filter length is automatically selected and adapted to the currently
measured value. With very high signals the filter length and therefore the
measurement time can be short. With very low signal levels the filter
length and therefore the measurement time is increased in order to
reduce noise. The used filter length is indicated in the field to the right.
"User"
The filter length is set manually.
The filter length is entered in the entry window to the right. As the filter
length works as a multiplier for the time window, this results in a constant
measurement time. Values 1 and 2^n are settable.
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.
"Fixed Noise"
The averaging factor is selected so that the sensor's 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.
To avoid very long settling times when the power is low, the averaging
factor can be limited with the "Timeout" parameter.
SCPI command:
SENSe<ch>[:POWer]:FILTer:TYPE on page 562
SENSe<ch>[:POWer]:FILTer:LENGth:AUTO on page 560
SENSe<ch>[:POWer]:FILTer:SONCe on page 561
SENSe<ch>[:POWer]:FILTer:LENGth[:USER] on page 560
SENSe<ch>[:POWer]:FILTer:NSRatio on page 561
SENSe<ch>[:POWer]:FILTer:NSRatio:MTIMe on page 561
Use SParameter - Power Sensors
Activates the use of the S-Parameters correction data of the connected power sensor.
For sensor with attenuator this checkbox is automatically checked.
Please see the manual of the connected R&S NRP power sensor for a description on
how to use the s-parameters table.
SCPI command:
SENSe<ch>[:POWer]:CORRection:SPDevice:STATe on page 559
Use Sensor for RF Lev. Control - Power Sensors
Enables/disables conroling of the RF level via the power sensor.
SCPI command:
n.a.
RF Signal and Analog Modulations - RF Block
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