3 Spectrum Analyzer Mode
3.3 Channel Power Measurement
Trace Average
The instrument maintains and displays an average trace, which represents the
cumulative average on a point-by-point basis of the new trace data and previous
averaged trace data.
Pressing Trace Average (for the selected trace), or sending :TRAC:TYPE AVER (for
the specified trace), sets the trace type to Trace Average, clears the trace, initiates a
new sweep, and restarts the Average sequence.
Details of the count limiting behavior and the averaging calculations may be found
under Avg|Hold Number and Average Type under Meas Setup.
When in Trace Average, if a measurement-related instrument setting is changed
(that is, one which requires new data to be taken, like Center Frequency or
Attenuation), the average restarts and a new sweep is initiated but the trace is not
cleared.
Restarting the average means:
–
The average/hold count k is set to 1, so that the next time the average trace is
displayed it simply represents one trace of new data
–
A new sweep is initiated
–
Once the new sweep starts, the trace is overwritten with current trace data as
the first trace of the new average
Remember that restarting averaging also restarts Max Hold and Min Hold, as there
is only one count for Trace Average and Hold.
Max Hold
The instrument maintains and displays a max hold trace, which represents the
maximum data value on a point-by-point basis of the new trace data and previous
trace data. Details of the count limiting behavior may be found under Avg|Hold
Number under Meas Setup.
Pressing Max Hold for the selected trace, or sending :TRAC:TYPE MAXH for the
specified trace, sets the Trace Type to Max Hold, clears the trace , initiates a new
sweep, and restarts the hold sequence, even if you are already in Max Hold.
When in Max Hold, if a measurement-related instrument setting is changed(that is,
one which requires new data to be taken, like Center Frequency or Attenuation), the
Max Hold sequence restarts and a new sweep is initiated but the trace is not
cleared.
Restarting the Max Hold sequence means:
Spectrum Analyzer Mode User's &Programmer's Reference 695
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