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I'm reading a sine wave generated by a AO DAQ and reading this same signal with another AI DAQ and a DMM at the same time. AO is set at 0.65V AI RMS reads 0.5VÂ±0.0056 DMM reads 0.46053V Â± 0.00001 0.65/1.414=0.46 so the DMM read is accurate. What makes the RMS LabVIEW function not reporting the accurate information? Could it be the Glitch Energy affecting the read? On a side note, I also need an accuracy of 0.2%. AO generates a 3KHz signal at 0.65V (450KS/s @ 150S/Buffer). AI reads at 90KS/s at 15KS/channel. DMM a 34401A is set VAC. Thanks