3 VMA Mode
3.6 Occupied BW Measurement
Trace Update
The numeric results are not blanked at any time during the restart cycle.
For slow sweeps (see Trace Update section in Trace/Detector), the traces are
updated real-time during the sweep. There may be a special circumstance in
application mode measurements where an exception is made and the traces and/or
results need to be blanked before displaying the new results.
To summarize, the following list shows what happens to the trace data on various
events:
Event Trace Effect
Clear/Write pressed (even if already in
Clear/Write)
Set to mintracevalue
Max Hold pressed (even if already in Max Hold) Set to mintracevalue
Min Hold pressed (even if already in Min Hold) Set to maxtracevalue
Trace Average pressed (even if already in Trace
Average)
Trace data unaffected but start new
sweep/avg/hold
Restart pressed Trace data unaffected but start new
sweep/avg/hold
Parameter requiring restart changed (e.g., RBW) Trace data unaffected but start new
sweep/avg/hold
Sweep and Trigger Reset
Resetting the sweep system resets the average/hold count k to 0. It also resets the
set point counter to 0. Resetting the trigger system resets the internal auto trig
timer to the value set by the Auto Trig control.
Averaging
The weighting factor used for averaging is k. This k is also the average/hold count
for how many valid sweeps (data acquisitions) have been done. This k is used for
comparisons with N, as those comparisons always needs to be based on valid
completed sweeps.
The displayed average/hold, K, shows the count for the sweep (data acquisition) in
progress. K = k + 1, with a limit of N. The displayed value K changes from its previous
value to 1 as soon as the trigger condition for the first data acquisition (sweep) is
met.
Vector Modulation Analyzer Mode User's &Programmer's Reference 1036
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