What Is A 'Peak - Agilent Technologies FieldFox N9912A User Manual

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The following applies to DTF Measurements ONLY:
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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 apply to all markers, and are set individually for
CAT, SA, or NA Modes.
These settings survive a FieldFox or Mode Preset. They are reset to the default
values when the FieldFox power is shutdown.
NOTE Peak Threshold and Excursion are NOT available in DTF measurements.
However, peaks below –50 dB will NOT be found and this can NOT be changed.
How to set Peak Criteria
 Press Mrk ->/Tools.
 Then
 Then
 Then select the following:
For example, the settings for the trace in the following image are:
128
Moves the active marker to the HIGHEST amplitude data point of the
Peak
trace. Peak Excursion value is ignored. In SA Mode, the LO feed-through signal
(0 Hz) is also ignored.
Moves the active marker to the next highest amplitude peak from
Next Peak
where it currently resides.
Moves the active marker to the next data point to the left that meets
Peak Left
the „Peak‟ criteria. When no data points to the left meet the „Peak‟ criteria, the
marker does not move.
Moves the active marker to the next data point to the right that
Peak Right
meets the „Peak‟ criteria. When no data points to the right meet the „Peak‟
criteria, the marker does not move.
More then:
Track Peaks ON OFF
peak with every sweep. While in this Mode, the markers can NOT be turned
OFF or moved.
Find 3 Peaks Three markers are created and find the highest peaks (faults)
on the trace.
Peak Search.
Peak Criteria
Minimum amplitude (dB). To be considered valid, the peak
Peak Threshold
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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.
Peak Excursion The vertical distance (dB) between the peak and the
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valleys 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 for CAT
and NA Modes; 6 dB for SA Mode.
Threshold: –10 dB
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When Track Peaks is ON, markers will find the new
N9912A FieldFox User's Guide