Measuring pt100 with PCI-6014 and BNC 2120

[VPS]

I want to measure temperature using a PT100 connected to a BNC 2120 connector block. The PT100 has a resistance of about 110 ohm at RT. I have connected it to res+ and res- of the BNC 2120. I use the example-vi 'BNC-2120 Ohm Meter' but it somehow it doesn't work. I always get the error -10003. Probably there is something wrong with my configuration of the channels.

[Spencer S.]

Steven,

What is the source of the -10003 error? The error out cluster on the front panel of the VI should display this information when the error occurs. Another question, did you change the example at all?

Let me know.

Spencer S.

[VPS]

The error occurs in the AI hardware config vi.

I have been playing around a little bit with the configuration of the channels but the basic program I did not change.

[Spencer S.]

OK, I think I know what is happening. The PCI-6014 does not support the RSE input mode. The BNC-2120 Ohm Meter.vi example is meant to be used with an E-Series device, which does support RSE, so it is setting the input mode of channel 3 to RSE. This is causing the error. You can modify the example so that it sets channel 3 to the NRSE input mode. This will take care of the error. On the example's block diagram, there is a cluster towards the top with "no change" and "2" as elements. Change the "2" to "3". Now that you are using channel 3 in the NRSE input mode, you will also need to wire your AISENSE pin to one of the AIGND pins (AISENSE should be connected to the signal reference when using the NRSE input mode). Although the resistance
measurement functionality of the BNC-2120 is meant for use with E-Series devices, this should work.

Spencer S.