Chapter 4 — Spectrum Analyzer 4-26 Marker
MS20xxA VNA Master UG 10580-00166 Rev. C 4-45
Marker to Ref Lvl
Sets the amplitude of the currently active marker to the top graticule line as the
reference level.
Peak Threshold
This soft key allows the user to specify how far above the average noise floor a
signal must rise before it is considered a peak.
Back
Returns to the higher-level menu.
More
Opens the Marker (2/2) submenu that contains additional Marker options.
Marker Noise
This marker option turns the markers into noise markers with units of dBm/Hz.
When this option is selected, the detection method is automatically changed to
RMS and the displayed value is compensated for the noise bandwidth of
resolution bandwidth filter. Marker Noise is not available when the analyzer is
set to Zero Span.
Marker Table
Pressing this soft key causes a table to be displayed below the sweep window. The
table is automatically sized to display all markers that are turned on. In addition
to the marker frequency and amplitude, the table also shows delta frequencies
and amplitude deltas for all markers that have deltas entered for them.
All Markers Off
This soft key turns off all markers and the marker table.
Counter Marker On Off
Sets the frequency counter mode for all markers. Marker frequency values are
normally limited in resolution to individual display pixels. Each pixel may
represent multiple frequencies. Using Counter Marker in association with
Marker to Peak will result in the exact frequency of the peak within the pixel to a
resolution of 1 Hz.
Set Marker To Channel
If a signal standard has been selected, pressing this soft key brings up a dialog
box to select a channel. Select a channel number for the current signal standard,
and the active marker will be set to the center frequency of the channel.
If no signal standard has been selected, a message “No standard selected. Press
Enter or Escape to Continue.” is displayed. Press either button to leave the
settings as they were before the soft key was pressed.
Marker Style Fixed Tracking
This soft key changes the behavior of the reference markers. If Fixed is selected,
reference markers stay at the amplitude they were at when the associated delta
marker was turned on. If Tracking is selected, the amplitude of the reference
marker changes as the signal amplitude is changed. Note that the reference
marker tracks the amplitude, not the frequency of a signal.
10580-00166C.book Page 45 Thursday, February 21, 2008 12:52 PM
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