Wiring String Potentiometers with different power supplies to NI9207

[kevlewins]

Hi,

I have an issue with wiring a number of sensors which require independent power supplies to a single 9207 card (I have 2 cards in total) and CompactDAQ combo. I have 12 sting pots (ASM POSIWIRE WS31-500-R1K), 1 inclinometer (Cline Labs Electronic Clinometer), 2 pressure transducers (ESI GS4200-0050AB), 4 load cells (RDP Amplifier Type S7DC).

The issue seems to be around requiring a single common throughout whilst require 24V and 10V supplies.

I am seeing ghosting of the an activated string pot on the other string pot signals.

Could anyone suggest an appropriate solution?

[NatanBiesmans]

Hi Kevlewins,

Could you please elaborate on the issue you are about your GND?

Have a look at the following and see if it might help:

http://www.ni.com/white-paper/3344/en/

In regards to your ghosting issue, please have a look at the following:

http://digital.ni.com/public.nsf/allkb/73CB0FB296814E2286256FFD00028DDF

Kind regards,

Natan Biesmans