Contec AIO-160802AY-USB, Руководство пользователя

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3. External Connection
Analog Input Signal Connection
Analog signal input types are divided into single-ended input and differential input. This product uses
single-ended input fixed. The following examples show how to connect analog input signals using a flat
cable and a shielded cable.
Single-ended Input
The following figure shows an example of flat cable connection.
Connect separate signal and ground wires for each analog input channel on CN2.
AI00..AI07
AGND
Terminal CN2 Cable Signal Source
Figure 3.5. Single-ended Input Connection (Flat Cable)
The following figure shows an example of shield cable connection. Use shielded cable if the distance
between the signal source and product is long or if you want to provide better protection from noise. For
each analog input channel, connect the core wire to the signal line and connect the shielding to ground.
AGND
Shield cable
AI00..AI07
Terminal CN2
Signal Source
Figure 3.6. Single-ended Input Connection (Shielded Cable)
CAUTION
- If the signal source contains over 1MHz signals, the signal may effect the cross-talk noise between
channels.
- If the product and the signal source receive noise or the distance between the product and the signal
source is too long, data may not be input properly.
- An input analog signal should not exceed the maximum input voltage (relate to the product analog
ground). If it exceeds the maximum voltage, the product may be damaged.
- Connect all the unused analog input channels to analog ground.
- The signal connected to an input channel may fluctuate after switching of the multiplexer. In this
case, the cable between this product and the signal source can be shortened or a buffer with a
high-speed amplifier can be placed between the product and the signal source in order to reduce the
fluctuation.
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AIO-160802AY-USB