X-Series Signal Analyzers Getting Started and Troubleshooting Guide 27
Front and Rear Panel Features
Display Features
Display Features
This section describes the regions of the display.
Invalid Data Indicator
The invalid data indicator is displayed whenever the data on the display
does not match the settings of the analyzer. The most common example
of this is when instrument settings have changed in the time since the data in
the traces on the display was taken. This means that the screen annotation
cannot be guaranteed to match the trace data. For example, if you change
Center Frequency, the invalid data indicator will display until a new sweep has
completed.
If any Trace is in View mode (displaying but not updating) and analyzer settings
are changed, the invalid data indicator will display as long as that trace
remains in View. Traces that are blanked do not turn on the invalid data
indicator.
Not all analyzer settings require display of the invalid data indicator when they
change, only changes that require a new acquisition will cause it to display.
For example, changing the Y-Axis scale of the analyzer does not cause the
invalid data indicator to display, unless the attenuation changes.
Also, the invalid data indicator is turned on:
— When the counter is turned on, until the completion of the first count
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