Can I measure voltage with a current module by removing the resistor?

[mjhill]

I'm trying to measure a 0-10 VDC signal and I don't have any voltage throughput modules for my 2345 signal conditioning unit. I do have some SCC-CI20 (4-20mA) input modules that use a 249 ohm resistor. The output from these modules are 1-5 VDC as expected. I'm wondering if I remove the resistor do I not have a voltage module?

Please help, I need to get some measurements done soon.

Thanks

[LYu]

Hi,

Yes, you can use the CI20 module to read in voltages. Connecting a voltage source in parallel with R3 will result in the same potential drop to appear across the R3 resistor (see diagram attached).

Make sure that you DO NOT configure the CI20 in the Measurement and Automation Explorer, so you can read the raw voltage. Also DO NOT supply more voltage than 5V, or you might damage the module.

Hope this helps,
Lesley Y.