I have a digital multimeter and its accuracy for VDC is marked like this:
±0,03%+10Digit
This multimeter has maximum display of 80000. So in the 80 V range it can show for example 79.999V.
0.03% of 80V is 0.024V – that is clear for me. But what does the +10Digit mean?
The device in question in Digitek DT-80000.
Best Answer
The 1 digit means that the least significant digit can be off by +/- 1. In this resolution 1 digit would mean +/- 0.001V. 10 digit means that basically of your 79.999V displayed, it could also be 79.989V (not including the 0,03%!)
So basically in your range the 10 digit specification means that +/- 0.03% + 0,01V is your error. For measuring 79.999V it means an absolute maximum error or +/- 79.999*0.03% + 10*0.001V = 0.034V.