108 N9912A FieldFox User’s Guide
Then Delta
Then enter a value from 0 (the most recent sweep record) to the maximum
value, using the numeric keypad, ▲|▼ arrows, or the rotary knob. A
indicates the Delta Marker.
At the current sweep speed, the difference in time between these two markers
appears at the upper-right corner of the view as Delta Time: hh:mm:ss Sec.
An invalid (very large number) appears when a trace record is not available at
one or both of these markers.
How to Restart the Spectrogram
Press Sweep 3 then Restart
Averaging
Averaging can be enabled on the underlying measurement. Press Trace 6
then State [Average]. Learn more on page 89.
Measurement Preset
Measurement Preset resets ONLY the Spectrogram and Waterfall display settings.
It does not reset the measurement settings.
Press Preset
Then Meas Preset
Waterfall Display
The live trace is always drawn on a Waterfall display. Older trace records scroll
up from the displayed trace and eventually off the screen. Because of this, locate
the live trace on the bottom of the screen using the scale and reference settings.
Learn more on page 74.
Note: Although this document refers to past traces as ‘records’ these traces are not
saved. They are only drawn on the FieldFox screen.
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