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Application note # 17
Sample Champion


VERY IMPORTANT NOTE:
To measure Impedance with the best accuracy,
use
Sample Champion Vr. 3.2 or higher !


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:

Impedance measurement 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

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:

Ellen's impedance measurement box

 

 

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