We are in need of being able to measure the temperature of a platinum RTD. Our current setup is a PCI-6052E with SCB-68 accessory. Am I right in thinking that in order to read resistance we need to obtain the SC-2042 RTD accessory? And if we do this, how do I go about using the analog outputs of the card? The SC-2042 RTD does not seem to have any outputs!
Or is there a way of doing this using our current setup?
Without the 2042 (or other signal conditioning module) you would have to make your own bridge circuit to measure the voltage across the RTD (See the tutorial 'Resistance-Temperature Detectors' in the Developer Zone at ni.com). The 2042 requires a 50-pin connection, so you'll have to use a SH6850 from your DAQ device or a cable adapter. You still have access to the unused channels (AI, AO, DIO, counters) of your DAQ card. There is a second 50-pin connector on the 2042 that allows you to connect another cable to a breakout box/terminal block. You will just have to make sure you don't connect to the AI channels that the 2042 is using.
Todd Newton Applications Engineering- Measurements Group National Instruments