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114 Chapter 4
C:\Spk\Ref\RefGuideRevE\Tools.fm
Overview of the Test Set’s Built-In Tools
Using the Spectrum Analyzer
Reference Marker (Ref Mrkr) Level and Frequency
In the delta marker mode, a second (reference) marker is placed at the
current location of the marker. The first marker becomes a moveable
delta marker. When the delta marker is moved, the difference in
frequency and level between the reference marker and the delta marker
are shown as the Delta Mrkr measurements on the right-hand side of
the screen. The reference marker can be set to either Hold or Norm.
When the Ref Mrkr field is set to Hold, the reference marker is frozen
at its current position (frequency and level) regardless of changes in the
signal level. This is useful for measuring multiple off-air carriers and
looking at the difference in power levels. The reference marker can also
be used when zeroing return loss.
When you switch from Hold to Norm, the reference marker will stay at
its current horizontal setting (frequency), but will track the level of the
incoming signal.
When switching from delta mode to normal mode, the delta marker
becomes the normal marker.