Appendix A SCPI Command Reference
AFANalyser subsystem
452 WCDMA Options Version 6.20
:AFANalyser:COUPling
:AFANalyser:BALanced
Description
Selects the fixed sampling rate for the AF analyzer's input signals.
KHZ8 means a sampling rate of 8 kHz,
KHZ11 a sampling rate of 11 kHz,
KHZ22 a sampling rate of 22 kHz,
KHZ33 a sampling rate of 33 kHz,
KHZ44 a sampling rate of 44.1 kHz, while
KHZ48 stands for a sampling rate of 48 kHz.
Query
The query form of this command returns the current setting. A query will return a
string, containing one of the predefined expressions explained above.
Example
:AFANalyser:SAMPlerate KHZ22
:AFAN:SAMP? Value returned: "KHZ22".
This means a fixed sampling rate of 22 kHz.
Syntax
:AFANalyser:COUPling <PredefExp>
Parameters
PredefExp is one of the following predefined expressions: AC|DC|DCLP. Default
is AC.
Description
This command allows to select between AC and DC measurements of the audio signal
applied to the “AF in” connector of the Willtek 4400.
If AC is selected, the audio analyzer measures the AC signal only, i.e. any DC compo-
nent in the signal is filtered out before the measurement.
With the DC setting, the signal is measured directly, including any AC and DC compo-
nents.
If DCLP is chosen, the AC components will be filtered out and the Willtek 4400 only
measures the DC component of the signal.
Query
The query form of this command returns the current setting. A query will return a
string, containing one of the predefined expressions explained above.
Example
:AFANalyser:COUPLING DC
:AFAN:COUP? Value returned: "DC".
Syntax
:AFANalyser:BALanced <PredefExp>
Parameters
PredefExp is one of the following predefined expressions: ON|OFF.
Default is OFF.
Description
Selects whether “AF in” shall be used as an unbalanced input (setting OFF) or as a
balanced input (setting ON).
Note: While a balanced signal requires a differential amplifier as an input stage, an
unbalanced input doesn't. Balanced signal transmission usually is substantially less
sensitive to electromagnetic interference.
Query
The query form of this command returns the current setting. A query will return a
string, containing one of the predefined expressions explained above.
Example
:AFANalyser:BALanced OFF
:AFAN:BAL? Value returned: "OFF".
This means that the AF in socket will be used as a standard input for 'grounded' sig-
nals.
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