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Thanks Kees for the suggestions. Pulled out a different DVM to check the shunt voltage and the shunt is correct. Provides 11.2 mV at 4.5 A. The meter also only has three predefined settings for APvH. 1 A. 5 A and 75 mV, so the wrong decimal setting is not possible here.
Purchased a JLD404 Amp Hr meter and most of the programming etc has worked well. However, where do you input the size of shunt into the calculation? I am using a 30A/75 mV shunt and have changed the A-Sn to 75 mV, APvL to 0, APvH to 30. When passing 10 A, the shunt is providing 25 mV to terminals 9 ...