Programming an Audio Frequency Measurement

Last updated: January 16, 2009

This section provides an example of how to make an audio frequency 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. When more than one audio frequency signal may be present, use the 100 Hz bandpass filter to isolate the desired signal for measurement (see the Programming Example below).
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 peak voltage
40                                                !for the audio input level in Vpeak.
50  OUTPUT 714;"SETup:AFANalyzer:FREQuency:STATe ON" !Enable audio frequency meausurement.
60  OUTPUT 714;"SETup:AFANalyzer:FILTer TBPass" !Select the 100 Hz bandpass filter.
70  OUTPUT 714;"SETup:AFANalyzer:FILTer:TBPass 6000 Hz" !Set the 100 Hz bandpass
80     !filter's center frequency to 6 kHz (example; to measure SAT frequency).
90  OUTPUT 714;"SETup:AFANalyzer:TIMeout 3S" !Set a timeout value of 3 seconds
100                                      !in case the measurement cannot be made.
110 OUTPUT 714;"INITiate:AFANalyzer" !Start the AF Analyzer measurement.                                
120 OUTPUT 714;"FETCh:AFANalyzer:FREQuency?" !Fetch the Audio Frequency  result.
130 ENTER 714;Audio_frequency !Enter the returned value into a variable.
140 END

Programming an Audio Frequency Measurement

Programming Example

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