Data Translation DT340, Getting Started Manual

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Using Your Own Screw Terminal Panel
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Digital Inputs and Counter/Timer Inputs
TTL-type inputs must have current limiting so that circuitry is not
damaged when power is removed. On all Data Translation PCI
boards, current limiting is used to prevent damage in this fault
condition.
On high-speed clock inputs, a ground that is located in the connector
next to the clock must be connected as a twisted pair with the
high-speed clock input.