INDUCTANCE METER ADAPTER 689 PDFJuly 7, 2020
Turn your Digital Voltmeter into an Inductance and capacitance meter. Page 1. Page 2. Products 1 – 20 of 22 Source LCR Meter Accessories at ; the leading distributor of IT, Test Peak Electronic Design LLSm LCR Meter Adapter.
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Inductance and capacitance meter adapter for DVM
This device is an addon to a digital or analog voltmeter. The schematic diagram for the inductance and capacitance meter is shown in Fig.
It works adatper an oscillator whose frequency is determined by the RC components R C5 in feedback circuits. A two deck rotary switch S1 selects one of five measurement ranges.
The transistor Q1 is used to amplify the signal to provide sufficient current through potentiometer R8 and a load circuit. A switch S2 is used to configure the measurement circuit. When it switched into position “L”, the measurement circuit operates as an inductance meter, see the Fig. This circuit provides DC output ijductance on the clamps X6, X7, and this voltage is directly proportional to the inductance of Lx. The voltage is negative.
The source of the voltage is negative pulses across the inductance Lx. When the switch S1 is in “C” position, it connects another diode into the circuit, making a voltage doubler induftance circuit see the Figure 3.
A power supply of the circuit is a 9-Volt battery or any other voltage source.
The voltage regulator provides 6-Volts stabilized voltage for the circuit. At first, adjust potentiometers R If not, then match the value of the resistor R7 to make shape of the signal as close to square meteer as possible. There is a way to check out the duty cycle at the collector of Q1.
This RC network operates as an integrator circuit. Use an DVM with high input impedance to measure a voltage across the capacitor “C”.
LC Connector adapter
Check out all five ranges. Inductance and capacitance meter adapter for DVM This device is an addon to a digital or analog voltmeter.
How the circuit works The schematic diagram for the inductance and capacitance meter is shown in Fig. The switch S2 is in position “L”. The switch S2 is in position “C”.