Contec AI-1204Z-PE, Reference Manual, Page: 38 / 85

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Installation
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AI-1204Z-PE Reference Manual
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2. Connecting Analog Input Signal
1. Single-ended Input
The following figure shows an example of shielded cable connection. For the CN1 each analog
input, connect the core wire to the signal line and connect the shielding to ground.
CAUTION
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Do not touch the external connector (BNC connector) when the power is on.
Otherwise this may malfunction, cause a failure due to static electricity.
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If the signal source contains over 5MHz signals, the signal may effect the cross-talk noise
between channels.
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If this product and the signal source receive noise or the distance between this product and
the signal source is too long, data may not be input properly.

The analog signal to be input should not exceed the maximum input voltage (based on this
product analog ground). If it exceeds the maximum voltage, this product may be damaged.
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Input data remains indeterminate when no input pin is connected. The input pin for the
channel not connected to the signal source must be connected to the analog ground.
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An input pin may fail to obtain input data normally when the signal source connected to the
pin has high output impedance. If this is the case, change the signal source to one with
lower output impedance or insert a high-speed amplifier buffer between the signal source
and the analog input board to reduce the effect.