Using Markers; Windowing - Protek A434L Operating Manual

 Press the Scale key to select a display unit of the Y scale.

4.2.4.2 Using Markers

Depending on the display settings, four or six markers can be used
simultaneously. The distance of a current marker position is displayed next
to each marker on the screen. Activate the marker table to see both the
magnitude and distance information. Use Marker Edit to move a marker to
the specific distance.
Adjust a trace point to change the resolution of the VSWR measurement.
Changing the Trace Point doesn't affect the calibration state.
Figure 4.9 Using Markers in DTF Measurement Mode

4.2.4.3 Windowing

Windowing is applied when an accurate fault location cannot be verified
due to the side overshoots of the trace. If the video filter is activated by
turning the Window On, side overshoots of the trace are reduced by
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