Common Mode Range AIO

RR4711 · Post by **RR4711** » 28 Nov 2019, 18:06

Since the 4 analog inputs share hardware on the AIO module, is there any statement on common mode voltage for the 4 inputs?

I understand the inputs are differential but what if they share a ground externally?

Example: I would for instance use one channel to measure a voltage at a DC load (e.g. a small motor) and with a 2nd channel i try to make a high side indirect current measurement by measuring the voltage drop over a shunt in the loads plus line?

What is the maximum voltage before I introduce errors or even destroy parts?

Markus

Post by **dirk** » 14 Jan 2020, 14:16

Hi Markus, it is 45 Volts.

RR4711 · Post by **RR4711** » 14 Jan 2020, 14:17

Thanks. Maybe something for putting into the datasheet (I couldn't find the info there)