THREE-PHASE A/D CONVERSION HAS HIGH ACCURACY AND LOW COST.

In general, there are three main types of analog-to-digital conversion techniques used in digital multimeters: conversion by successive approximation, conversion by circulating remainder and conversion by integrated slope. The integrated slope technique offers the best accuracy, linearity and immunity to noise, but not the highest speed. However, this is not a handicap for relatively low-speed applications as in digital multimeters, where the human response in reading data requires more time than is normally needed for accurate conversion. Conversion rates of 2 to 3 per second are easily obtained; greater speeds may produce undesirable flicker and may be difficult to read or interpret.