3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
Multiple Detectors
The instrument always provides the requested detector on the specified trace.
Depending on the detectors requested the instrument can provide up to three
different detectors simultaneously within the constraints of its digital processing
algorithms. Some detectors utilize more resources; the Quasi-Peak detector, for
example, utilizes most of the digital IF’s resources, and the hardware in some
instruments is incapable of providing another detector when Quasi-Peak is on. If the
limit of system resources is exceeded, detectors on some existing traces may be
forced to change. When this happens, they change to match the detector just
requested, and a message is generated: “Detector <X> changed due to physical
constraints”, where X might contain multiple values.
Example: User has traces 1, 2, and 3 with Peak, Average, and Negative Peak. User
specifies QPD for trace 1. Traces 2 and 3 also change to QPD and we generate the
message “Detector 2,3 changed due to physical constraints”. Now all three traces
have the QPD.
Detector Select Auto/Man
Sets the Detector mode to Auto or Manual. In Auto, the proper detector is chosen
based on rules that take into account the measurement settings and other
instrument settings.
When you select any detector explicitly, this toggles automatically to Man (manual).
Remote Command
[:SENSe]:DETector:TRACe[1]|2|…|6:AUTO ON | OFF | 1 | 0
[:SENSe]:DETector:TRACe[1]|2|…|6:AUTO?
Example Set trace 2 detection to automatic:
:DET:TRACE2:AUTO ON
Dependencies The auto detector rules depend upon marker type, averaging state and type, trace state writing mode,
and trace active state
When operating a source in Tracking Source mode, Auto selection is the Average detector. All other
detector selections are allowed, but in most cases you will want to stick with Average, which gives
optimal sensitivity
Couplings Selecting Auto, whether by pressing the control or sending the equivalent command, turns trace math
OFF for the selected/specified trace
Preset Auto (On) for all detectors
State Saved Saved in instrument state
Backwards Compatibility Command
Example
:DET:AUTO ON
Notes SCPI only. Turns AUTO on or off for all detectors. This is a legacy command to preserve the classic
functionality wherein all traces are affected when a detector is addressed
528 Spectrum Analyzer Mode User's &Programmer's Reference
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