Analogue Ml Ltimeter

18 ANALOGUE ML LTIMETER by T. Giffard An advanced electronic multimeter with no fewer than 80 ranges and easily reproducible accuracy. An important consideration with home construction of test equipment is invari- ably the achievable accuracy and the de- pendence thereof on the calibration procedure. The analogue multimeter de- scribed here has no alignment points simply because its accuracy is derived mainly from close-tolerance (0.1%) re- sistors. These components have long been outside the reach of the hobbyist, but are now gradually becoming avail- able in small quantities and at reason- able cost. The 0.1% resistors used in the present meter may be replaced with less expensive 1% types at the cost of some accuracy. One feature that makes the analogue multimeter a particularly interesting test instrument is the large number of ranges available for measuring voltage, current and resistance: there are no fewer than eighty. Analogue versus digital The choice between a digital and...