What is the relationship between the “No. of Least Significant Digit” and the accuracy of a handheld multimeter?

The “No. of Least Significant Digit” affects the accuracy of a handheld multimeter. (The least significant digit is the lowest digit in a number, located at the far right of a string.)

For example:

If you need to measure an AC voltage: 5V 40Hz, with the U1251A Handheld Multimeter, calculate the accuracy by refering to the U1251A's AC specifications table in the U1250 Series Handheld Digital Multimeters datasheet.

Range: 5.0000V

Frequency range: 30 Hz to 45 Hz

Based on the U1251A's AC Accuracy ± (% of reading + No. of Least Significant Digit):

Tolerance range

= 1% of reading + 60 x resolution

= 1% x 5.0000V + 60 x 0.0001 V

= 0.056 V

Total accuracy = 5.0000±0.0560 V