3 Spectrum Analyzer Mode
3.4 Occupied BW Measurement
Option Behavior
and the trace averaging function
For details, see "Detector Select Auto/Man" on page 867
NORMal
The detector determines the peak of the CW-like signals, and it yields alternating
maximums and minimums of noise-like signals. This is also referred to as Rosenfell
detection
AVERage
The detector determines the average of the signal within the sweep points, using
RMS averaging
POSitive
Peak
The detector determines the maximum of the signal within the sweep points
SAMPle
The detector indicates the instantaneous level of the signal at the center of the
sweep points represented by each display point
NEGative
Peak
The detector determines the minimum of the signal within the sweep points
RMS
Equivalent to AVERage
Because they may not find a spectral component's true peak, neither AVERage nor
SAMPle detectors measure amplitudes of CW signals as accurately as
POSitivePeak or NORMal, but they do measure noise without the biases of peak
detection.
Remote
Command
[:SENSe]:OBWidth:DETector[:FUNCtion] NORMal | AVERage | POSitive | SAMPle |
NEGative | RMS
[:SENSe]:OBWidth:DETector[:FUNCtion]?
Example
:OBW:DET NORM
:OBW:DET?
Set the detector to Average. Average uses RMS averaging, so this is equivalent to selecting an RMS
detector:
:OBW:DET RMS
Notes The query returns a name that corresponds to the detector type, as follows
The RMS selection sets the detector type to AVERage, with RMS averaging. Therefore, if RMS had been
selected, the query returns AVER
String Returned Definition
NORM
Normal
AVER
Average (RMS)
POS
Peak
SAMP
Sample
NEG
Negative Peak
Couplings When "Detector Select Auto/Man" on page 867 is ON, the values returned by the query depend on the
setting of "Trace Type" on page 1927 as follows:
866 Spectrum Analyzer Mode User's &Programmer's Reference
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