3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
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 the trace has been retaken.
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.
The invalid data indicator is also turned on:
–
When the counter is turned on, until the completion of the first count
–
When a trace is imported from mass storage and the trace’s parameters do not
match the current instrument settings
–
When a trace is sent to the instrument from a remote interface (since there is no
way to know if its settings match)
NOTE
The Invalid Data Indicator has an associated status bit that can be checked at
any time to see if the indicator is on.
Trace right-click menu
If you right-click on a trace (or touch and hold a trace and wait for the circle to
close), the Trace Right-Click menu appears:
Spectrum Analyzer Mode User's &Programmer's Reference 507
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