Appendix A SCPI Command Reference
MEASure subsystem
WCDMA Options Version 6.20
323
:MEAS[:CONT]:AFAN:ACVoltage:PEAKp
Description
Starts a continuous measurement of the most important audio tests. To read out the
latest measurement results, use the :FETCh:AFAN:ALL command.
The audio tests performed by this command are:
ACVPeakp, the peak-to-peak measurement of an AC voltage,
ACVRms, the RMS-valued measurement of an AC voltage,
DCV 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 starts the measurements and – after all measure-
ments have been completed and all measurement results obtained – delivers a string,
containing six floating point real numbers, representing the six measurement result
values. 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. DCV, 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:CONTinuous:AFANalyser:ALL?
In this case, all audio measurements will be performed in a sequence. As soon as all
measurements have been completed and all measurement results obtained, a string
will be delivered back containing six measurement result values:
"0.7,0.25,0.0,1000.0,0.3,50.5".
Syntax
:MEAS[:CONT]:AFAN:ACVoltage:PEAKp
Parameters
There are no parameters.
Description
Starts a continuous measurement of the AC peak-to peak voltage of the AF signal
applied to the audio analyzer. To read out the latest measurement result, use the
:FETCh:AFAN:ACV:PEAK command.
Note: Any AF test command needs the Audio Option to be installed on your Willtek
4400.
Query
The query form of this command starts the measurement and delivers a string, con-
taining a floating point real number, representing the first measurement result value.
The physical dimension is volt, measured peak-to-peak (V
pp
).
Example
:MEAS:CONT:AFAN:ACV:PEAKp?
String delivered back: "0.7".
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