What Is A 'Peak - Agilent Technologies N9913A User Manual

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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 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 the following:
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.
For example, the settings for the trace in the following image are:
182
Track Peaks ON OFF
peak 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)
Find 3 Peaks
on 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.
Peak Excursion The vertical distance (dB) between the peak and the
o
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
o
Excursion: 1 dB
o
Scale = 1 dB / Division.
o
When Track Peaks is ON, markers will find the new
FieldFox User's Guide