QA402 User Manual
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In short, this mode is useful for DUTs that do not have an analog input. By playing a special WAV exported from
the QA40x application, you can trigger a sweep and learn the frequency response from of the DUT using a
chirp.
Audition
Audition allows you to play back a WAV file. The settings are shown below. The WAV file is loaded into RAM,
and then playback begins at the volume level specified. The output attenuators can be locked to the specified
full scale. For example, if you s18 dBV output attenuator, then a 0 dBFS signal will be +18 dBV. And if
you specify the +8 dBV output range and a -20 dBFS volume, then the max output will be -12 dBV.
Cursors
The cursor control block is shown below:
You can add one or two cursors to your measurement, and each cursor can be associated with either the left
or right trace. Cursors can remain off screen as you pan looking for events in the data. To bring them back on
screen quickly, the Center button will snap the cursor to the center of the current display window. The Left and
Right buttons allow you to associate the cursor with the indicated channel. And the Peak button will slightly
nudge the cursor onto a nearby peak.
A legend will be shown in the low
er left of the display, including delta’s for each measurement:
