General Description
R&S
®
CMW-B400B/-B405A
16
User Manual 1176.8116.02 ─ 04
All generator and measurement settings are included in a single dialog box. To
open it, select the "Analog Meas" tab or the "Digital Meas" tab and press the "Con-
fig" hotkey.
Configure first the used generators. Especially select a signal type and configure
the measurement coupling. Then configure the measurements.
6. Turn on the used internal/external generator(s).
To turn on an internal generator, proceed as follows:
a) Select the "Analog Meas" tab or "Digital Meas" tab.
b) Select the relevant generator softkey ("Analog Generator" or "Digital Genera-
tor").
c) Press "ON | OFF" and wait until the generator softkey indicates the "ON" state
and the hour glass symbol has disappeared.
7. Start the internal/external audio measurement(s).
To start an internal measurement, proceed as follows:
a) Select the tab of the measurement to be started ("Analog Meas" or "Digital
Meas").
b) Select the measurement softkey ("Analog Meas" or "Digital Meas").
c) Press "ON | OFF" to start the measurement.
The measurement results are displayed in the measurement tab.
Parallel measurements
One audio board supports two audio application instances. And each instance provides
an analog generator, a digital generator, an analog measurement and a digital mea-
surement. So in total there are four audio generators and four audio measure-
ments.You can use all these resources in parallel, for example to test several DUTs in
parallel or to perform stereo tests.
If your test setup contains more than one acoustic coupling, it is recommended to use
only one coupling at a time, so that they do not interfer. That means, transmit an audio
signal only via one coupling at a time.
Example: If both the microphone and the speaker of a DUT are coupled to the test
setup acoustically, test the speaker path and the microphone path one after the other.
Activate the audio generator of only one path at a time.
If the audio board is equipped with a single speech codec, this codec can be used by
the first instance of the audio application. Each codec can be coupled to only one sig-
naling application at a time.
3.3 AF Filter Settings
The AF input path of the audio measurements provides the following configurable filter
stages which affect the AF results:
●
Lowpass filter with a cutoff frequency of 3 kHz, 4 kHz or 15 kHz
●
Highpass filter with a cutoff frequency of 6 Hz, 50 Hz or 300 Hz
AF Filter Settings
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