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I am using an ADC-16 to measure voltages from a laser and I have found that the values I get from the the logger are greater by about 20% compared to ones measured using a normal DVM.
Thank you for your post.
If you try measuring a 1.5V battery with the unit, does this also shw the correct voltage? Try measuring some different things to see if the unit is giving faulty readings all the time.
Let me know how you get on