Economic meter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The avometer is made on field-effect transistors and is designed to measure direct and alternating voltage (up to 1 kHz), direct current, resistance; capacities of electrolytic capacitors. The scheme and main characteristics of the avometer are shown in the figure.
The input resistance of the avometer is 9 MΩ, the current consumption in the modes of measuring small or large (review range) resistances does not exceed 13 mA, in other cases - 2 ... 3 mA, and the battery is connected with the SB1 button only at the time of measurement; otherwise, the normally closed contacts of the SBI button protect the input circuits of the device from overload.
Measurements are made on a linear scale (with the exception of the viewing range "Rx x 10" - Rx measurement up to 3 MΩ).
Measurement of the capacitance of electrolytic capacitors is carried out in the resistance measurement mode by the time the capacitor is charged to a certain voltage value through a source of quasi-stable current (a chain of switched resistors R1-R5, R12 according to the formula:
Cx, uF = Kt, sec, where K is the range multiplier, t is the capacitor charging time to a certain mark on the instrument scale in seconds.
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