| Application
note # 17 |
Sample
Champion
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VERY IMPORTANT NOTE:
To measure Impedance with the best accuracy,
use
Sample Champion Vr. 3.2 or higher !
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Impedance
measurement: pratical construction of the connector
This application note describes the construction of the connectors
for using the
Sample Champion Impedance Plugin (see Application
note #16).
The
plugin accepts two different configurations for the connection
of the device under test (loudspeaker).
Allowed
configurations
Basically,
one channel output is connected directly to one channel input
and the other one measures the impedance by means of a simple
partitive network.
Another
way of describing it is reported in the following scheme:
The
following examples refer to the first configuration in the plugin.
Assuming
a soundcard with female minijack connectors for Line input and
Line output, the following example requires:
- 2 common stereo minijack-RCA cables
-
3 RCA male connectors and 3 adapters female RCA-female RCA or
3 female RCA connectors
The
impedance measurement connector can be assembled as shown in
the following figure:
Impedance
measurement connector
Zooming
of the above figure.
Note
that all grounds are connected together.
Then
the 2 minijack-RCA cables must be connected to Input and Output
of the soundcard and to the above connector as shown in the
following figures:
Alternatively
the connector can be assembled starting from a minijack connector.
The following figure shows a minijack.
Another
possible construction scheme, using a box, is shown in the following
figure:
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