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1305
Trace/Detector
Trace Averaging: More Information
Pressing the
Trace Average key (for the selected trace), or sending the TRAC:TYPE AVER command
(for the specified trace), sets the trace type to
Trace Average and causes the average to be restarted.
When in
Trace Average, if a measurement-related instrument setting is changed, 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
In Max Hold type the test set 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.
Pressing the
Max Hold key for the selected trace, or sending the :TRAC:TYPE MAXH command for the
specified trace, sets the trace type to
Max Hold, causes the trace to be cleared, and causes the Max Hold
sequence to be restarted.
When in
Max Hold, if a measurement-related instrument setting is changed, the Max Hold sequence
restarts and a new sweep is initiated but the trace is not cleared.
Restarting the
Max Hold sequence means:
• The average/hold count k is set to 1, so that the next time the max hold trace is displayed it simply
represents one trace of new data
• A new sweep is initiated.
Example TRAC2:TYPE AVER
Notes See “Trace/Detector” on page 1301.
Couplings Affected by
Average Type and Average/Hold Number
Whenever you press Trace Average or send the equivalent SCPI command,
Update
is set to On and Display is set to On.
Automatic detector selection and the VBW:RBW ratio auto rules both depend
on the trace type selections.
Preset after a Preset, any trace that is in Trace Average is cleared (all trace points set
to mintracevalue).
State Saved the type for each trace is saved in Instrument State
Initial S/W Revision Prior to A.02.00