Appendix A SCPI Command Reference
MEASure subsystem
WCDMA Options Version 6.20
329
:MEAS:ARRay:AFAN:ACVoltage:PEAKp
Description
Performs a standard sequence of the most important audio tests a specific number of
times (set with the int1 parameter). To read out the entire measurement results
array, use the :FETCh:AFAN:ALL command. The tests performed by this com-
mand are:
ACVPeakp, the peak-to-peak measurement of an AC voltage,
ACVRms, the RMS-valued measurement of an AC voltage,
DCVRms is used to measure AC ripple on DC lines (this measurement gives the root-
mean spare voltage of the AC component of the applied DC signal).
FREQuency is the measurement of the audio frequency in Hertz,
DISTortion is the distortion measurement on the third harmonic of a sine wave
and expressed in %, while
SINad is the measurement of the signal to noise ratio, expressed in dB.
Notes:
– Please keep in mind that the start of a new AF test will always terminate all
other measurements (see section “The MEASure subsystem” on page 237 for
details).
– Any AF measurement will need the Audio Option to be installed on your Willtek
4400.
– For further details regarding group measurements, please refer to section
“:MEASure:...:GROup” on page 244.
Query
The query form of this command performs the measurements and - after all mea-
surements have been completed and all measurement results obtained - delivers a
string, containing (6* int1) measurement result values. The single measurement
result values are separated by commas. All measurement result values are floating
point real numbers. The order of these measurement result values delivered back is
as follows:
1. ACVPeakp, representing the AC peak-to-peak voltage of the AF signal,
2. ACVRms, representing the RMS-valued AC voltage of the AF signal,
3. DCVRms, representing the RMS-valued AC voltage on an applied DC signal,
4. FREQuency, representing the audio frequency,
5. DISTortion, representing the third-harmonic distortion of the applied sine-
wave AF signal and,
6. SINad, representing the signal to noise ratio of the applied AF signal.
Example
:MEASure:ARRay:AFANalyser:ALL? 2
In this case, the sequence of standard AF measurements will be performed twice. As
soon as all measurements have been completed and all measurement results
obtained, a string will be delivered back containing twelve measurement result val-
ues:
"0.7,0.25,0.0,1000.0,0.3,50.5,
0.75,0.3,0.0,1000.0,0.25,50.9".
Syntax
:MEAS:ARRay:AFAN:ACVoltage:PEAKp <int1>
Parameters
int1 is an integer.
The minimum value for int1 is 0, the maximum value is 100. The default value for
int1 is 0.
Description
Performs the measurement of the AC peak-to-peak voltage of the AF signal applied
to the audio analyzer a specific number of times (set with the int1 parameter). To
read out the entire measurement results array, use the
:FETCh:AFAN:ACV:PEAK command.
Note: Any AF test command will need the Audio Option to be installed on your
Willtek 4400.
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