Audio Generator and Analyzer (Option CMU-B41) CMU
1100.4903.12 4.80 E-10
Results
The table and output fields in the left half of the table show the results for both
audio circuits (applications Analyzer 1 and Analyzer 2). If an analyzer is switched
off (see measurement control softkey Analyzer 1 on p. 4.77), OFF is indicated
above the corresponding output column and the output fields show invalid results
("---").
The values in the AF Voltage table represent the measured voltages of the AF
signals:
Peak 1/2 Peak value of the AC component of the measured AF signal in
V. The numbers 1 and 2 denote two different input paths for AF
signals with different filter configuration; see Fig. 4-37 on p. 4.83.
RMS 1/2 Effective (RMS-averaged) value of the AC component of the
measured AF signal in V.
DC DC component of the measured AF signal in V
Frequency Frequency of the measured AC signal
Distortion Ratio of the measured AF signal with a notched-out reference
frequency to the complete measured AF signal in percent. The
reference frequency of the distortion measurement set in the
Distortion tab of the configuration menu (see p. 4.82) is indi-
cated in brackets below the output field.
If the reference frequency is equal to the fundamental frequency
of the AF signal, the Distortion value corresponds to the Total
Harmonic Distortion and Noise. To avoid suppression of the first
harmonic, the bandwidth of the notch filter is automatically ad-
justed to be smaller than the reference frequency.
Remote control
READ[:SCALar]:AFANalyzer:<Applic>[:RESult]?
FETCh[:SCALar]:AFANalyzer:<Applic>[:RESult]?
SAMPle[:SCALar]:AFANalyzer:<Applic>[:RESult]?
AF Connector
Overview
The figure below the result table shows the destination of the input signals fed in
via AF IN and AUX 1 and the signal sources for the two audio output connectors
AF OUT and AUX 2.
For standalone audio measurements and network tests in Non Signalling mode the
routing of input and output signals is fixed: The connectors AF IN and AF OUT
are used as input and output for the primary audio circuit (Analyzer 1, Generator
1). AUX 1 and AUX 2 are used as input and output for the secondary audio cir-
cuit (Analyzer 2, Generator 2).
If network tests are performed in Signalling mode and a speech codec is available,
the routing of input and output signals is is a function of the Speech Decoder
output destination. For more information refer to the network test manuals.
Settings
The Settings table gives an overview of the configuration of the current measure-
ments. This includes the settings made via the softkeys and hotkeys of the Audio
menu.
Remote control
Settings are read out using the query corresponding to the setting command (set-
ting command with appended question mark). See section Test Settings on p. 4.77
ff..
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