Rohde & Schwarz SMM100A, User Manual

Page: 415 / 1088

Configuring the RF signal
R&S
®
SMM100A
415 User Manual 1179.1341.02 ─ 05
Remote command:
:SENSe<ch>[:POWer]:SOURce
on page 712
Frequency ← Sensor Settings
Defines the frequency value if "Source > User" is used.
Remote command:
:SENSe<ch>[:POWer]:FREQuency
on page 710
Level Offset State,Level Offset ← Sensor Settings
Activates and defines a level offset which is considered in the power meassurement
result. The level offset value is always expressed in dB, irrespective of the display of
the measurement result.
This function allows you to consider, for example, an attenuator in the signal path.
Remote command:
:SENSe<ch>[:POWer]:OFFSet
on page 711
:SENSe<ch>[:POWer]:OFFSet:STATe
on page 711
Filter ← Sensor Settings
Selects the way the length of the used filter is defined.
See also "About the measuring principle, averaging filter, filter length, and achieving
stable results" on page 410.
"Auto" Selects the filter length automatically and adjusts it to the measured
value. The value is indicated with the parameter
Filter Length .
When high output power is applied, the filter length and therefore the
measurement time can be short.
When low output power is applied, the filter length and therefore the
measurement time is increased which reduces the considered noise
content in your measurement.
"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 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 710
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.
Improving level performance