I have installed a JCIXT with a 6 AI 2 AO expansion. I have only connected 2 AI, 0-10V there. I used an external power supply to power up the sensor (DPT). When I initially power up the DX9100, it reads correctly, but then it starts to increase voltage until it reaches maximum. When you measure voltage against AI common, voltage drops to normal voltage, but it rises up again. Now this happens with the Power Supply negative out connected to common or not. Please help.