Meter L and C. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The device is intended for use in amateur radio practice, it makes it possible to measure the capacitance of capacitors within 10 pF - 10 μF, the inductance of coils and chokes within 10 μH -1 H. The measurement error does not exceed 4%, the results are displayed on the microammeter scale at 100 μA.
The circuit diagram is shown in the figure.
(click to enlarge)
On the microcircuits, a generator of rectangular pulses is made, the frequency of which can be changed in steps using the switch S1. This is followed by a measuring bridge with a microammeter at the output. Coils and capacitors are connected, respectively, to the "L" and "C" connectors. The device is powered from a mains source on a power transformer T1, a diode rectifier on VD6-VD9 and a stabilizer on VT1.
When selecting parts, you can take almost any decimal CMOS or MOS counters, for example, K561IE14 or K176IE4, and turn them on in series according to the decade divider circuit. It should be borne in mind that for K176 microcircuits, it is necessary to increase the supply voltage to 9-10 V by replacing the KS156 zener diode with D818, KS210. In general, to power the K561 microcircuits, you can select a voltage from 5 to 15 volts, respectively, and a zener diode can be selected for this voltage. Diodes D9 can be replaced with D18, D20 or, better, with GD507. KD522 - any silicon impulse.
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