RTD with SC2345 and SCC-RTD01

Hello

I have a problem with certain measures RTD with the PXI-6289, SC-2345 and SCC-RTD01 setup. I have implemented a DAQmx task in the project, using the following schema:

Name: RTD_Temperatures

HAVE channels 16, 17, 19, 21, 23

RO = 100

PT3851

0 to 250 degrees f.

1mA external excitation

Acquisition mode: 1 sample (on request)

I use a wire 4 PR - 12 RTD of Omega. I've also attached the code what I am about.

My problem is that I don't get the good value of the PXI for RTD temp. I measure the resistance of the probe (109.3 ohms) with a voltage of 0.109V. Using these values, I checked the source of 1mA expected excitement. By raising the resistance of the probe and comparing it to a table of R/T, the temperature should be ~ 75 degrees (who felt all right). However the "temperature", I read of the PXI was 562. I have 5 different channels, and each channel read the same thing when the probe was connected to it. Without a connection to a probe, it was-400 or more. I think it was just due to no connection. I am concerned about the high concentration.

I modeled the code after a thermocouple VI we use already and has proved its worth. Thermocouples connect to the other the 6289 through a SCC68 connector. I thought changing the task to a task of RTD DAQmx would be sufficient. The filter is just a smoothing filter. Any advice or thoughts would be greatly appreciated.

Thank you!

BLUF: When you use the SC2345 and SCC-RTD01, create a new device in MAX under your PXI for the SC2345 and configure the modules you have in each slot of the SC2345. Create a task in MAX (or project), and then select the SC2345 / MOD #: I # (or something similar to that) as the physical read channel.

I finally thought to her last minute yesterday! I have been setting up tasks in MAX under the card/slot DAQmx which had connected SC2345. It seemed logical to me; but my assumption was that the module RTD conditioning the signal and an output value (voltage or what not) to the card and the user just read what is on the card. But I had to in order to operate, the installer places the SC2345 as a new device in MAX under PXI devices. This brought a dialog box configure the SC2345 with the location of the RTD modules. After doing this, when I created a new task, new channel options for each module of the SC2345 appeared. Then you can choose what input of the module (ai0 or ai1) channel to read from. Configure the task to read the SC2345 / MOD #: ai0 instead of saying, PXISlot6/ai0 (where the SC2345 has been actually connected to PXI), gave correct results. I don't know what it means that, insofar as what is doing signal between the module and the PXI, but whatever he does, set up to read from the module worked well.

Tags: NI Hardware

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