Knowledgebase: Audio Analyzers
Analyzing Amplifier Output Signals
Posted by Rick Shao on 13 November 2015 03:03 AM

It's important to remember that the Phonic audio analyzers do not have built in filters for use in testing amplifier output. To analyze the output signal of an amplifier, users will need to use an appropriate amplifier filter to reduce the wattage and thus avoid – to put it bluntly – frying the PAA3 or PAA6. These units are often passive, allowing the input signal from the amplifier to be dialed down from the 'hot' amplifier signals that would normally power speakers. One such filter would be the Audio Precision AUX-0025 which is used in the filtering of switch-mode amplifier signals (class D and other).

If using the PAA6, analyzing can be done like this:

  1. Connect the PAA6's output connector to the input channel(s) of the amplifier to be tested.
  2. Turn on the PAA6's sine wave signal.
  3. Connect the amplifier output(s) to the amplifier filter.
  4. Connect the filter's output to the PAA6 input(s).
  5. Be sure to turn on the PAA6 before the amplifier.
  6. You can now receive the amplifier signals in any of the PAA6 functions, including but not limited to the THD+N, scope and fast Fourier transform.
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