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Use of signal ground

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Bringing 8,  0 to 5v egt values in via the analog inputs, the temp probes are converted to 0 to 5v by a custom interface i build many years ago using 8 ad595 chips, wondering whether it is appropriate to ground this circuit board from signal ground like the 0 to 5v sensors, to assist in noise rejection?  High side supply will be what you call +14V


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