What Is A 'Peak - Keysight N9923A FieldFox User Manual

The following applies to DTF Measurements ONLY:

What Is a 'Peak'

You define what the FieldFox considers a "peak" by setting the Peak Threshold and
Peak Excursion.
These two peak criteria settings are set individually for each trace and for each mode
(CAT, SA, or NA).
These settings do NOT survive a FieldFox or Mode Preset.
NOTE The Peak Threshold and Excursion settings are NOT available in DTF measurements.
To make these settings, create a non-DTF CAT mode measurement, then change the
measurement back to DTF.
How to set Peak Criteria
 Press Mrk ->/Tools.
In CAT and NA modes:
In SA mode:
 Then
Then select from the following:
For example, the settings for the trace in the following image are:
Data Analysis Features
More.
o
Track Peaks ON OFF
o
with every sweep. While in this Mode, the markers can NOT be turned OFF or
moved.
Three markers are created and find the highest peaks (faults) on
Find 3 Peaks
o
the trace.
Then
Peak Search.
o
Then
More
o
Then
Mkr Properties
o
Peak Criteria
Minimum amplitude (dB). To be considered valid, the peak
Peak Threshold
o
must be above the threshold level. The valley on either side can be below the
threshold level. Default = –190 for CAT and NA Modes; –90 for SA Mode.
Note: CAT mode Loss measurements are displayed in positive values. In these
cases, the Peak Threshold setting is inverted. For example, Peak Threshold = -20
will consider any peak that has less Loss than 20 dB to be valid.
The vertical distance (dB) between the peak and the valleys
Peak Excursion
on both sides. To be considered a peak, data values must "fall off" from the peak
on both sides by the excursion value. Default = 0.5 dB.
Threshold: –10 dB
o
Excursion: 1 dB
o
Scale = 1 dB / Division.
o
When Track Peaks is ON, markers will find the new peak
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