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Digital LCR Meters

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Digital LCR Meters theory and introductions

Most laboratories are equipped with digital multimeters (DMMs) for measuring DC resistance, but LCR meters for measuring inductance, capacitance, and impedance are harder to find. LCR meters function by applying AC voltage to the device under test (DUT) and measuring the current's amplitude and phase. Capacitive impedance causes the current waveform to lead the voltage, while inductive impedance causes it to lag.

LCR meters are electronic testing devices used to measure the inductance (L), capacitance (C), and resistance (R) of electronic components. Simple testers measure impedance and display the derived capacitance or inductance values. If the DUT has no significant resistance, these readings are quite accurate. Advanced testers measure inductance and Q factor for inductive components, or capacitance and equivalent series resistance for capacitors.

The electrical characteristics measurement methods for capacitors, inductors, and resistors involve connecting the DUT in series with a reference resistor. A digitally generated sine wave signal is applied to the circuit, producing different amplitude and phase voltages. An A/D converter samples these voltages, and digital signal processing (DSP) converts them into vectors. These vectors help calculate the series or parallel equivalent circuit, determining the capacitance, inductance, or resistance value, as well as the dissipation factor for capacitors or quality factor for inductors.

Digital oscilloscope

Description: An oscilloscope is an indispensable electronic instrument for electronic maintenance engineers in the laboratory. It is used to display and analyze the waveform of electronic signals. Whether it is a traditional cathode ray oscilloscope or a modern digital storage oscilloscope, these tools are widely used in the automotive industry, university laboratories, aerospace, defense industries and other fields. This article introduces a series of oscilloscope features and their evolution as technology advances. Oscilloscopes Search for the product you need here View all products we offer View all oscilloscopes Compare and choose the oscilloscope that best suits your use, bandwidth, analog channels, digital channels, sample rate.