Multimeter repair. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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If you are a radio amateur, then. most likely, you are familiar with this "miracle" called: "Digital multimeter XXX-xx". This ubiquitous measuring device, in general, not bad (from the amateur radio "bell tower") measures the main parameters: direct and alternating voltage, current, etc. (depending on modification). But its main advantage is the price. It is so low that the failure of a multimeter (a fairly common occurrence) is not even capable of upsetting properly. Some radio amateurs, knowing his weakness, keep a couple more new ones in reserve.
Nevertheless, it is somehow a pity to immediately throw out the "naughty" device in the trash. Reviews of those who tried to repair such a multimeter boil down to the fact that it is enough to replace the burned-out microcircuit (it is one inside - a "drop", i.e. unpackaged) with a domestic analogue KR572PV5 (the pinout is the same).
This operation is performed in several stages:
- cut off all conclusions from the "drop";
- remove the indicator;
- install and solder the socket for a domestic microcircuit, connecting the printed tracks with the socket outputs with wire jumpers;
- carefully check the installation, remove the flux residues;
- insert the microcircuit (KR572PV5) into the socket;
- connect power;
- we select the accuracy of the readings with a tuned resistor (it is the only one there).
Information sources
- msevm.com
- I.V. Novachenko. V.A. Taurus. Microcircuits for household radio equipment. Add. 2: Handbook. - M., 1991.
Author: V.Novikov
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