8 Frequency Scan Measurement
Trace/ Detector
EMI Average
This sets the detector for the currently selected trace to EMI Average. Unlike the regular Average detector,
the EMI Average detection displays the average value of the amplitude envelope, rather than the average
value of the
sample-detected amplitude. It is defined for EMI measurements by the CISPR 16–1–1 standard and, in the
X-series,
uses a sophisticated algorithm to implement a lowpass filter that conforms to the latest CISPR standard.
Key Path
Trace/Detector, Detector
Example FSC:DET:TRAC3 EAV Selects the EMI average 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
RMS Average
This sets the detector for the currently selected trace to RMS Average, a frequency dependent
RMS/Averaging filter, used in making CISPR compliant EMI measurements. This filter conforms to the 2007
revision of the CISPR 16–1–1 standard.
This detector does one averaging process (in the VBW hardware) on the power (RMS) scale and another
process on the voltage scale using a meter movement simulator similar to the one used in the QPD filter.
Key Path
Trace/Detector, Detector
Example FSC:DET:TRAC3:RAV Selects the RMS Average detector for trace 3.
Couplings If the user selects 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
Average
This sets the detector for the currently selected trace to Average. For each bucket (interval) in the trace,
Average detection displays the average of the amplitude within the bucket using Voltage envelope.
Key Path
Trace/Detectort, Detector
Example FSC:DET:TRAC2 AVER Sets the detector to peak for trace 2.
584 EMI Receiver Mode Reference
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