9-13 Marker Menu Chapter 9 — Interference Analyzer, Option 25
9-28 MS20xxA VNA Master UG 10580-00166 Rev. C
Peak Search
This soft key places the currently active marker on the highest signal amplitude
currently displayed on screen.
Marker Freq to Center
This soft key changes the center frequency to place the currently active marker at the
center of the display.
Marker to Ref Level
This soft key causes the amplitude of the currently active marker to become the
reference level, which is the top horizontal line of the display.
More Peak Options
This soft key brings up a secondary menu of soft keys for more peak searching options.
Peak Search
This soft key places the currently active marker on the highest amplitude signal
currently on screen.
Next Peak Left
From the current position of the active marker, the instrument searches to the
left (toward lower frequencies) for a peak signal that rises at least a certain
amount above the average noise level. If no such peak is found, then the marker
is placed at the left end of the trace. The
Peak Threshold soft key allows the user to
specify the performance of peak searching.
Next Peak Right
From the current position of the active marker, the instrument searches to the
right (toward higher frequencies) for a peak signal that rises at least a certain
above the average noise level. If no such peak is found, then the marker is placed
at the right end of the trace. The Peak Threshold soft key allows the user to
specify the performance of peak searching.
Delta Marker to Span
Sets the total span width to the value of the delta marker. If the delta marker is
zero, then the span is set to 10 Hz. If there is no delta marker, or if the delta
marker value is set to less than 10 Hz, then the span will be set to 10 Hz.
Marker Freq to Center
Sets the center frequency to the frequency of the currently active marker.
Marker to Ref Lvl
Sets the reference level (top graticule line) to the amplitude of the currently
active marker.
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. This feature can be especially
useful in noisy environments, where there are a lot of small noise spikes. The
default peak threshold is 10%. In noisy environments, increase the peak
threshold to avoid stopping on noise spikes or small signals.
Back
Returns to the higher-level menu.
10580-00166C.book Page 28 Thursday, February 21, 2008 12:52 PM
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