3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
Event Trace Effect
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.
3.2.9.2 Sweep Config
Accesses controls that enable you to configure the sweep and control functions of
the instrument, such as Sweep Rules.
Sweep Type
Sweep Type refers to whether or not the instrument is in Swept or FFT analysis.
When in Auto, the selection of Sweep Type is governed by two different sets of rules,
depending on whether you want to optimize for dynamic range or for speed.
FFT “sweeps” should not be used when making EMI measurements; therefore, when
a CISPR detector (Quasi Peak, EMI Average, RMS Average) is selected for any active
trace (one for which Update is on), the FFT option in the Sweep Type menu is
grayed-out, and the Auto Rules only select Swept. If Sweep Type is manually
selected as FFT, the CISPR detectors are all grayed-out.
Spectrum Analyzer Mode User's &Programmer's Reference 491
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