156 FieldFox User’s Guide
Peak Moves the active marker to the HIGHEST amplitude data point of the
trace. Peak Excursion value is ignored. In SA Mode, the LO feed-through signal
(0 Hz) is also ignored.
Next Peak Moves the active marker to the next highest amplitude peak from
where it currently resides.
Peak Left Moves the active marker to the next data point to the left that meets
the ‘Peak’ criteria. When no data points to the left meet the ‘Peak’ criteria, the
marker does not move.
Peak Right Moves the active marker to the next data point to the right that
meets the ‘Peak’ criteria. When no data points to the right meet the ‘Peak’
criteria, the marker does not move.
The following applies to DTF Measurements ONLY:
More then:
Track Peaks ON OFF When Track Peaks is ON, markers will find the new
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.
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:
o Then Peak Search.
In SA mode:
o Then More
o Then Mkr Properties
Then Peak Criteria
Then select the following:
o Peak Threshold Minimum amplitude (dB). To be considered valid, the peak
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.
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