Programming A Distortion Measurement; Programming Example - Agilent Technologies 8960 Series Reference Manual

Programming a Distortion Measurement

This section provides an example of how to make distortion measurements via GPIB. Distortion
measurements are not typically made when testing W-CDMA mobiles, but are more common when testing
AMPS or other analog mobiles. The programming example below is typical for an AMPS mobile.
SINAD and Distortion measurements are affected by the same STATe and INITiate commands, so both
measurements are enabled and triggered at the same time. However, measurement results are queried
separately. See "Audio Analyzer Measurement Description" on page
The following procedure assumes that the mobile's audio output is connected to the AUDIO IN connectors and
the mobile is on an analog voice channel (AVC). The AVC is being modulated with a 1004 Hz tone at ± 8 kHz
peak deviation, and a 6000 Hz SAT at ± 2 kHz peak deviation. It is also assumed that the Cell Power from the
test set is set to -50 dBm (IS-137 standard).
1. Configure audio analyzer measurement parameters using the SETup subsystem.
2. Start the audio analyzer measurement using the INITiate subsystem.
3. Use the FETCh? subsystem to obtain audio analyzer measurement results.

Programming Example

10 OUTPUT 714;"SETup:AFANalyzer:CONTinuous OFF" !Set the audio analyzer
20
30 OUTPUT 714;"SETup:AFANalyzer:PEAK:VOLTage 3V" !Set the Expected Amplitude level for
40
50 OUTPUT 714;"SETup:AFANalyzer:SDIStortion:STATe ON" !Turn on the SINAD and
60
70 OUTPUT 714;"SETup:AFANalyzer:SDIStortion:FREQuency 1004 HZ" !Specify the audio
80
90 OUTPUT 714;"SETup:AFANalyzer:FILTer CMessage" !Select the c-message filter.
100 OUTPUT 714;"SETup:AFANalyzer:DEMPhasis:STATe OFF" !Turn off de-emphasis.
110 OUTPUT 714;"SETup:AFANalyzer:EXPandor:STATe OFF" !Turn off the expandor.
120 OUTPUT 714;"SETup:AFANalyzer:TIMeout 3S" !Set a timeout value of 3 seconds
130
140 OUTPUT 714;"INITiate:AFANalyzer" !Start the AF Analyzer measurement.
150 OUTPUT 714;"FETCh:AFANalyzer:INTegrity?" !Query the integrity indicator to
160
170 ENTER 714;Integrity
180
190 IF Integrity=0 THEN
200 OUTPUT 714;"FETCh:AFANalyzer:DISTortion?" ! Fetch the Distortion result.
210 ENTER 714;Distortion !Enter the returned value into a variable.
220 END IF
230 END
!frequency to use for the measurements.
!in case the measurement cannot be made.
!verify that a reliable measurement was made.
!Enter the returned value into a variable for comparison
!with possible integrity indicator values (not shown here).
!Only fetch measurement result if integrity indicator is 0.
33.
!measurements to single trigger mode.
!audio input voltage in Vpeak.
!distortion measurements.
S:\Hp8960\E1963A WCDMA\3.2 release\Reference Guide\Chapters\wcdma_prog_distortion.fm
Programming a Distortion Measurement
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