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How can we use a 34980A to build multi-ch TC Simulator?

Question asked by dll on Sep 25, 2014
Latest reply on Oct 6, 2014 by tomc
We have to verify 80 type K Thermocouple inputs to a PLC. Is it possible to build a multi-channel TC calibrator using a single channel (Fluke 725 or DC Voltage supply), a 34980A, and 2ea 34921A and 34921T cards?  We will build a wiring harness with TC wire, to connect all 80 channels to the 34921T.  We will verify one reading one channel at a time to prove correct wiring, then we hopefully apply the remaining voltages to all channels at the same time to expedite testing.

What is the best way to accomplish this?
Should we turn off the internal DMM and use one of the analog busses to get the DCV signal to each channel?  What about cold compensation at the various points?
Should we leave the internal DMM operational and setup to measure each channel as a type K, then connect the DCV supply to the common bus (feeding the internal DMM) and apply different voltages?  I think the unit under test and the 349890A would both indicate the same temperature.  

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