Interference between channels using a block of cFP-TC-120, CB-3 connection

Using a CB-3 with a cFP-TC-120 module connection block for read sensors millivolt. The sensors are pressure with an excitation of 10V sensor. Millivolt signal varies 8mv to-70mv. All have 8 differential channels wired in two of these modules sitting in slots 3 and 4, a slot 4 back on the plain. There is also the 24V in the electrical box used by two modules to relay PSC - 421 driving valves that open, leads at room temperature or in separate the empty rooms they are in slots 1 and 2. Do to the cFP-TC-120 the same and each is affected in the same way, more interference is not only between the same module 120 channels, but also between the modules! If a sensor is vacuum where the millivolt is around 7 mV reading is stable through the following conditional changes. "If a sensor is emptied at room temperature, say channel 6 and channel one is already at room temperature its reading can change by 0.25mv be affected by the evacuation of other channels. This worsens proportional number of channels is ejected by up to 0.5 mV for all other channels that are evacuated. This module is differential and each channel and the module are isolated we don't understand where or how this interference takes place. Help!

Ben,

We have done some trouble shooting and isolated in millivolts sensor signal of the NOR. We found that voltage was real and electronics is not the field point. The system runs on 24V except for sensors that have an excitation of 12v. We found that the Commons between these continuous tensions were just that, each have been shared. We have separated the Commons and vola! Perfection.

Leigh

Tags: NI Hardware

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