Last updated: January 16, 2009
This section provides an example of how to make SINAD measurement via GPIB. SINAD 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 .
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) that is being modulated with a 1004 Hz tone at +/-8 kHz peak deviation. It is also assumed that the Cell Power from the test set is set to a minimum usable level (typically about -116 dBm).
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 ON" !Turn on the SINAD and 60 !distortion measurements. 70 OUTPUT 714;"SETup:AFANalyzer:SDIStortion:FREQuency 1004 HZ" !Specify the audio 80 !frequency to use for the measurements. 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 !in case the measurement cannot be made. 140 OUTPUT 714;"INITiate:AFANalyzer" !Start the AF Analyzer measurement. 150 OUTPUT 714;"FETCh:AFANalyzer:INTegrity?" !Query the integrity indicator to 160 !verify that a reliable measurement was made. 170 ENTER 714;Integrity !Enter the returned value into a variable for comparison 180 !with possible integrity indicator values (not shown here). 190 IF Integrity=0 THEN !Only fetch measurement result if integrity indicator is 0. 200 OUTPUT 714;"FETCh:AFANalyzer:SINAD?" !Fetch the SINAD result. 210 ENTER 714;Sinad !Enter the returned value into a variable. 220 END IF 230 END
The results returned by this program are: