george seifert Posted March 31, 2011 Report Posted March 31, 2011 I think something changed in the niDMM code in LV2010 SP1. My code worked fine before the SP1 upgrade. The problem is I need the DMM to allow current to flow through it (in current measurement mode) even when I'm not making a measurement. Before the upgrade I used a niDMM Initiate VI to do that. Even after a waveform measurement my circuit, current was still allowed to go through the DMM. Now after the upgrade, the DMM opens up after the measurement. I have to reinit the DMM before current will flow again. What's the correct way to setup a DMM so that it can be left in the circuit at all times? George Quote
george seifert Posted March 31, 2011 Author Report Posted March 31, 2011 False alarm. Turns out the problem was that I had set the range on the DMM to 100 uA (it used to be set higher). Apparently at this setting the internal drop across the DMM is enough to interfere with my circuit in such a way that I thought it was disconnected. George Quote
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