Programming an Audio Level Measurement

Last updated: January 16, 2009

This section provides an example of how to make an audio level measurement with the Audio Analyzer (AFANalyzer) via GPIB.

The following procedure assumes that an audio source is connected to the AUDIO IN connectors. See Audio Analyzer Measurement Description .

Configure audio analyzer measurement parameters using the SETup subsystem. Even though default settings exist for each parameter, it is a good idea to deliberately set each parameter to make sure the setting is correct for the specific audio analyzer measurement you are making.
Start the audio analyzer measurement using the INITiate subsystem.
Use the FETCh? subsystem to obtain audio analyzer measurement results.

Programming Example

 
10  OUTPUT 714;"SETup:AFANalyzer:CONTinuous OFF" !Set the audio analyzer
20                                           !measurements to single trigger mode.
30  OUTPUT 714;"SETup:AFANalyzer:PEAK:VOLTage 3V" !Set the Expected Amplitude level for
40                                                !audio input voltage in Vpeak.
50  OUTPUT 714;"SETup:AFANalyzer:SDIStortion:STATe OFF" !Turn off the SINAD and
60                                                  !distortion measurements since
70                                                  !they are not being used.
80  OUTPUT 714;"SETup:AFANalyzer:FILTer NONE" !Bypass all audio filters.
90  OUTPUT 714;"SETup:AFANalyzer:DEMPhasis:STATe OFF" !Turn off de-emphasis.
100 OUTPUT 714;"SETup:AFANalyzer:EXPandor:STATe OFF" !Turn off the expandor.
110 OUTPUT 714;"SETup:AFANalyzer:DETector RMS" !Specify the RMS detector for the
120                                            !audio measurement.
130 OUTPUT 714;"SETup:AFANalyzer:TIMeout 3S" !Set a timeout value of 3 seconds
140                                      !in case the measurement cannot be made.
150 OUTPUT 714;"INITiate:AFANalyzer" !Start the AF Analyzer measurement.                                 
160 OUTPUT 714;"FETCh:AFANalyzer:VOLTage?" !Fetch the Audio Level result.
170 ENTER 714;Audio_level  !Enter the returned value into a variable.
180 END

Returned Values

The results returned by this program are:

Integrity returns the measurement integrity indicator (0 means a successful measurement with no errors). See Integrity Indicator .
Audio_level returns the analog audio level in volts rms.

Programming an Audio Level Measurement

Programming Example

Returned Values

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