Coupling between two AI channels - NI Discussion Forums: "On the other hand, the input resistance is very high (> 10 Gohms), and so any charge left on an otherwise unconnected line will determine the voltage on the line. When the multiplexer switches from your connected load cell channel to the unconnected (floating) channel, the charge stored from the first channel remains in the multiplexer circuitry and holds the voltage where it was until a lower impedance is connected and can influence it. This is why the unconnected channel appears to follow the connected one."
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