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Making an Attenuation Sweep
The Automatic Sweep
3.2 The Automatic Sweep
An automatic sweep is one where stepping from one attenuation
factor to the next is done by the instrument.
Setting Up an Automatic Sweep
There are four parameters for the automatic sweep
• START is the attenuation factor at which the sweep begins.
• STOP is the attenuation factor that ends the sweep. If START
and STEP are such that the sweep does not end exactly at
STOP, then the sweep ends at the immediately previous value.
• STEP is the size of the attenuation factor change. This value is
always positive, even for a sweep of decreasing attenuation
factor. STEP cannot be set to a value greater than the difference
between START and STOP.
• DWELL is the time taken for each attenuation factor.
NOTE The dwell time includes the time it takes for the filter attenuation to
change. The time taken to change depends on the size of the attenuation
factor change, and is in the range 20 to 400ms (typical value is 200ms).