Hello,
I am new in LabView world and I would appreciate your help regarding the grounding problem I have.
I use PCIe 6343 and 6341 with 3 scb-68 boards connected. Beside this I have AVR stk600 eval. board with µC connected to the PC via USB-cable and one home-made board which is connected to the power supply.
PCIe cards have their internal ground point and this ground point differs from power supply ground. For this reason the signal from LabView is wrongly interpreted on the home-made and stk600 boards.
When I connect the GND from supply voltage to one of AO GND on the scb-68 I just get another wrong voltage value.
How is internal GND point set in PCIe cards, and what should I do in order to have the same GND ref. point for scb-68 and 2 additional boards? How should I connect them?
The picture of the whole hw setup is attached.