Battery tester. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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The battery tester described below is really simple and convenient. But it should be remembered that you need to use it, knowing exactly the type of the element under test. According to the book "Batteries and Accumulators", the nominal voltages of various types of batteries are as follows: mercury-zinc - 1,25 V; air-zinc - 1,4 V; alkaline - 1,5 V; salt (carbon-zinc) 1,6 V; silver - 1,8 V. In practice, mainly salt and alkaline elements are used. But they also have some variation in rated voltages, which must be taken into account.
Now on the market a wide variety of batteries, from cheap to expensive. But among all this mass there are many fakes and expired items. The proposed device is designed to identify unusable elements (Fig. 1).
P1, VT1, R1, R2 - elements of the measuring circuit. Resistance R3 and button SB1 are designed to test the battery under load. Turning on the indicator through a transistor is done in order to stretch the scale readings. When the indicator is turned on through a quenching resistor, it is almost impossible to distinguish a voltage of 1,5 from 1,6 V.
Design. The view of the device is shown in Fig.2.
The body is made from an old ignition coil from an IZH motorcycle. The lower carbolite part of the coil is taken. In place of the upper shoulder, a recess was made for cover 2, then a window was cut out. A contact washer 5 is glued into the upper part of the housing, machined along the inner diameter of the housing 3. A contact spring 6 with a wire soldered to it is glued into the lower part of the housing. The spring is taken from the battery compartment of a cassette recorder. Lotion cap is taken as the top cover 2. All circuit elements are mounted in the top cover. Indicator P1 is also taken from a cassette recorder. Before installation, the disassembled indicator was connected together with the circuit to an adjustable voltage source and calibrated. The scale view is shown in Fig.3.
For convenience, the scale sector up to 1,3 V was colored red, from 1,3 to 1,5 V - yellow, after 1,5 V - green.
The tester is designed to install R20 batteries, as well as R6 finger batteries, but with an adapter. The adapter is machined from textolite, a hole for the battery is drilled in the center. A contact plate with a protrusion inside is glued to the lower part of the adapter (Fig. 4).
Using the tester is simple: you need to insert a battery inside, placed in an adapter or without it, and read the indicator readings. To determine the voltage under load, press button 4.
Author: S.M. Usenko
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