24 X-Series EMI Receiver Getting Started Guide
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 instrument. 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 instrument
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 instrument 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 instrument 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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