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The Philpott · 16th Jun 2019, 10:12 pm

I do have an AD584 which seems ok, i previously relied on an 'Adafruit' Vref supplied by Pimoroni (from UK stock) which is on a breakout board about the size of a micro SD card. You do have the job of wiring it in to an appropriate project box though. It was about £7 and produces 2.048v or 4.096v from a PP3.

When calibrating ACV on a couple of meters i started off using an inverter generator's offload 230v sinewave, on the basis that the processed output should be quite precise. I checked the output with a pair of Avo Model 9/II meters, which read 229.5v and < 231v. On this basis (and on the balance of probabilities) i took this as a 230vAC reference for checking a couple of DMM's- both of which needed adjustment- and not just by 1 volt, i might add.

Dave

16th Jun 2019, 10:12 pm	#15
The Philpott Dekatron Join Date: Aug 2016 Location: Colchester, Essex, UK. Posts: 4,108	Re: Fluke 8010A digital multimeter I do have an AD584 which seems ok, i previously relied on an 'Adafruit' Vref supplied by Pimoroni (from UK stock) which is on a breakout board about the size of a micro SD card. You do have the job of wiring it in to an appropriate project box though. It was about £7 and produces 2.048v or 4.096v from a PP3. When calibrating ACV on a couple of meters i started off using an inverter generator's offload 230v sinewave, on the basis that the processed output should be quite precise. I checked the output with a pair of Avo Model 9/II meters, which read 229.5v and < 231v. On this basis (and on the balance of probabilities) i took this as a 230vAC reference for checking a couple of DMM's- both of which needed adjustment- and not just by 1 volt, i might add. Dave