channel to channel isolation

2 posts / 0 new

Sat, 10/12/2019 - 17:27

Ttrain

Hello,

If I have a series of voltages say 1.2V, 1.8V, 3.3V, 12V, and 27V and I want to measure them, can I just keep the A0-A6 channels connected to each voltage without affecting the operation? I'm reading about 2MegOhms between the A0 and A1, just unsure if having 27V on A0 and 1.2V on A1 is a good idea or really no issue?

Newbie

Mon, 10/14/2019 - 12:55

LabJack Support

The U3's analog inputs are

The U3's analog inputs are not isolated. Connecting voltages above the limits in the datasheet will, at best, result in the voltages being clamped to a safe level.

https://labjack.com/support/datasheets/u3/appendix-a

To measure those higher voltages we need to use a voltage divider to keep them within the U3's safe operating range.