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rcerva

Unistream analog problem

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Hi.  Hope someone can help.  I've got 2 analog input cards in my system.  All configured the same.  The one card my temp is stable but the 2nd card the reading fluctuates a lot. from 1 to 35 to 17 and so on.  Connected pt100 connected to convertor to 4-20ma directly in panel to see is cable fault.  Still the same.

Any ideas please.

Thanks.

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check your grounding, analog inputs don't tolerate much common mode offset.

the fluctuating siganal could be routed near a noisy source, for example a VFD motor.

temporarily switch the two and see if the problem follows the sensor.  

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