Instrument Function
R&S
®
SMBV100A
169Operating Manual 1407.6062.32 ─ 08
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 con-
stant 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 490
SENSe<ch>[:POWer]:FILTer:LENGth:AUTO on page 488
SENSe<ch>[:POWer]:FILTer:LENGth[:USER] on page 488
SENSe<ch>[:POWer]:FILTer:NSRatio on page 488
SENSe<ch>[:POWer]:FILTer:NSRatio:MTIMe on page 489
Use SParameter - Power Sensors ← Filter Length - Power Sensors
Activates the use of the S-Parameter correction data of the connected power sensor. For
sensors with attenuator this checkbox is automatically checked.
Refer to the manual of the connected R&S NRP-Zxx power sensor for a description on
how to use the SParameter table.
SCPI command:
SENSe<ch>[:POWer]:CORRection:SPDevice:STATe on page 487
5.4.7 NRP-Z Level Control
With the NRP-Z Level Control function, you can achieve a very stable and accurate RF
power supplied to your DUT. With the aid of a downstream control circuit, a closed loop
power control, you can detect frequency response characteristics of the used compo-
nents, such as losses due to cables, modules or components like power amplifiers, and
compensate these effects accordingly.
RF Signal and Analog Modulations - RF Block
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