I have the white and green outputs of four Omega PX180B (100mV = 200 psig full scale) full bridge pressure transducers hooked to a FieldPoint FP-AI-100 analog input module. I have a separate regulated 10V DC supply providing power to each transducer. At zero pressure, FieldPoint Explorer and LabView read only small offset milivolts as expected. When one transducer is exposed to 100 psig and the others are at zero, the exposed transducer milivolt signal is reduced to about 80 psig; while the other three read from 5 to 10 psig. I think they are interacting? How can I prevent this? Can I ground the COM terminal of the FP-AI-100 module? If so, to the 10V DC supply or to the FP-1000 module?

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I'll let you know how it all works out. Thanks very much.

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