Detection Method; How To Set Detection Method - Keysight A Series User Manual

Electromagnetic Interference (EMI) Measurements – Option 361
EMI Measurements Mode Settings

Detection Method

Using the EMI feature, can have one of three specific independent detection
methods: Fast SA Scan, is similar to the original detection method used in SA
mode that can use only one detector. CISPR Band Scan and CISPR Zoom
Scan use a newer detection method that uses one detector per trace (e.g., up
to three detectors and three traces simultaneously). Learn more, refer to
"Trace Display States (EMI Mode)" on page
APD Statistics uses trace inputs in lieu of detection. Learn more, refer to
– (Trace Input for APD Measurements)" on page

How to set Detection Method

The current Detection method for each trace is labeled on the left edge of the
screen. A corresponding letter appears below the corresponding Trace number
selected. For example: P means that Positive Peak was the selected detector.
— Press Trace_6 >
— Then choose from the following:
342
Detector
The following softkeys are only available when CISPR Band is set to Fast SA
Scan:
— Auto Displays the most appropriate Detection method based on
other settings. [# is NOT shown]
— Normal [#Nrm also referred to as Rosenfell] Provides a better visual
display of random noise than Positive peak and avoids the
missed-signal problem of the Sample Mode. Should the signal both
rise and fall within the bucket interval, then the algorithm classifies
the signal as noise. An odd-numbered data point displays the
maximum value encountered during its bucket. An even-numbered
data point displays the minimum value encountered during its
bucket. If the signal is NOT classified as noise (does NOT rise and fall)
then Normal is equivalent to Positive Peak.
— Negative Peak [#NPk] Displays the minimum value of all the
measurements in each bucket.
— Sample [#Smp] Displays the center measurement of all the energy
detected in each bucket. This setting gives a good representation of
the random noise in each bucket. However, it does not ensure that all
signals are represented.
— Average [#RMS] Displays the Root Mean Squared (RMS) average
power of all the measurements in each bucket. This is the preferred
method when making power measurements.
The following softkey is available for most CISPR Band choices, but not
APD Statistics:
340.
343.
Keysight N9927-90020 User's Guide
"Input