8 Frequency Scan Measurement
Trace/ Detector
Average, then for Detector 3, RMS Average is grayed out. If the grayed out key is pressed, an advisory
message is generated. If the equivalent remote command is sent, this same message is generated as
part of a “–221, Settings conflict” warning.
The Average detector and EMI detector are mutual exclusive. If an Average detector is selected, the
other three EMI Detectors are grayed out on the other two traces, and vice visa. If an EMI
Detector has been selected on another trace that is turned off when the Average detector is
selected, the detector for that trace will be changed to Peak detector automatically. If the grayed
out key is pressed, an advisory message is generated. If the equivalent remote command is sent,
this same message is generated as part of a “–221, Settings conflict” warning.
Couplings Selecting any CISPR detector on any active trace sets the EMI Standard to CISPR.
Voltage averaging will be used.
Preset POSitive
State Saved Saved in instrument state.
Range POSitive|Quasi Peak|EMI Average|RMS Average|Average|Negative
Initial S/W Revision A.07.00
Peak
This sets the detector for the currently selected trace to Peak. For each bucket (interval) in the trace, Peak
detection displays the highest amplitude within the bucket.
Key Path
Trace/Detector, Detector
Example FSC:DET:TRAC2 POS Sets the detector to peak for trace 2.
Couplings Selecting a detector for a trace (pressing the key or sending a [:SENS]:FSC:DET:TRAC command) puts
Update On and Display On for that trace, even if that detector was already selected.
Initial S/W Revision A.07.00
Quasi Peak
This sets the detector for the currently selected trace to Quasi Peak. This is a fast-rise, slow-fall detector
used in making CISPR compliant EMI measurements and defined by CISPR Publication 16–1–1. Quasi-
peak detection displays a weighted, sample-detected amplitude using specific, charge, discharge, and
meter time constants derived from the legacy behaviors of analog detectors and meters. It is used for EMI
measurements to provide a specific and consistent response to EMI-like signals.
Key Path
Trace/Detector, Detector
Example FSC:DET:TRAC3 QPE Selects the quasi-peak detector for trace 3.
Couplings If the you select this detector on any active trace, the EMI Standard will be set to CISPR. If any
inactive trace with this detector selected goes active, the EMI Standard is set to CISPR.
Selecting a detector for a trace (pressing the key or sending a [:SENS]:FSC:DET:TRAC command) puts
Update On and Display On for that trace, even if that detector was already selected.
Initial S/W Revision A.07.00
EMI Receiver Mode Reference 583
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