Hi Dave,

I agree we could make a more accurate meter, (oddly there is a ten digit HP one flickering away on the bench beside me, but given the tests I am doing I only write down the first 3 or 4, as the others just fruit machine)  but as we are agreed, in this case it ends up being a futile test rather like  measuring walnuts with a micrometer - a different very precise 'right' answer every time.  Meanwhile, in the interests of a trade off of battery current and cost of instrument, the ones in the MFTs are dual slope or SAR designs (the SAR ones being capacitor balance types that are a part of the microcontroller chip itself, which is another design compromise ), and there is no great need of temperature compensation, or 4 wire probing, or all the things you would need to do to get the next place figures to mean something.

Hi Dave,

I agree we could make a more accurate meter, (oddly there is a ten digit HP one flickering away on the bench beside me, but given the tests I am doing I only write down the first 3 or 4, as the others just fruit machine)  but as we are agreed, in this case it ends up being a futile test rather like  measuring walnuts with a micrometer - a different very precise 'right' answer every time.  Meanwhile, in the interests of a trade off of battery current and cost of instrument, the ones in the MFTs are dual slope or SAR designs (the SAR ones being capacitor balance types that are a part of the microcontroller chip itself, which is another design compromise ), and there is no great need of temperature compensation, or 4 wire probing, or all the things you would need to do to get the next place figures to mean something.