Capacitance meter for electrolytic capacitors. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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Electrolytic capacitors change their capacitance during operation and storage, so sometimes it becomes necessary to measure their capacitance.
The principle of operation of a capacitor capacitance meter from 3000 pF - 300 μF is based on measuring the pulsating current flowing through the capacitor. The variable component of this current is proportional to the capacitance of the capacitor.
The lower limit of the capacitance of the measured capacitors is limited by the sensitivity of the current meter; the upper one is the time constant of the discharge circuit of the investigated capacitor and the resistor connected in series with it.
Capacitor Co - calibration. Before the measurement, the contacts of the switch S3 are closed and the arrow of the device is set to the mark corresponding to the capacitance of the exemplary capacitor with the resistor R7.
Alternating current is obtained by half-wave rectification of a reduced mains voltage. Transformer T1 - network, from any tube broadcast receiver. It must have a filament winding for a voltage of 6,3 V and a current of at least 1 A. The dissipation power of the resistor R1 is at least 5 watts. Two fuses are needed - one in the power circuit, the second protects the pointer in case of short circuit of the terminals to which the capacitor Cx is connected, or in the event of a breakdown of the capacitor under test.
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