Diagram of a digital indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The proposed digital indication scheme basically corresponds to that recommended by the manufacturer. Circuitry and components were selected to obtain maximum measurement accuracy and stability.
(click to enlarge)
An external precision K142en19 (TL431, LM431) was used as a reference voltage source. This made it possible to bring the supply voltage range +/-3.5 +/-5.5V without loss of measurement accuracy. Because the circuit is used to measure voltages that are symmetrical with respect to the common wire, bipolar power is selected. The ratings of the parts indicated in the diagram are optimal and it is not advisable to change them. For example, an increase in the clock frequency leads to a shift in the value of the measured voltage by 2 units; and changing the parameters of the integrating circuit - to a noticeable non-linearity between the actual and indicated voltage.
The types of capacitors are indicated in the diagram; while reducing the requirements for measurement accuracy, capacitors of other types and smaller geometric dimensions, even of the KM5 or KM6 type, can be used. The printed circuit board is divided into two parts - the microcircuit itself and the indication, in order to reduce the size and the possibility of using different indicators. The board provides places for installing zener diodes and load resistors at a supply voltage of more than +/-5 volts. To indicate the position of the decimal point on the indicator board, chip resistors are soldered, their value is 210 Ohm for S / D indicators, or 2-5 MΩ for LCD. To facilitate the selection of values, the resistors R3-R4 are made up of two resistors connected in series.
Publication: radiokot.ru
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