LCR digital bridgeIt is a high-precision electronic measuring instrument used to measure parameters such as inductance (L), capacitance (C), resistance (R), and impedance (Z). It is widely used in electronic component testing, circuit design, quality control, research and development, and education.

　　LCR digital bridgeBased on the "AC bridge balance principle" design, compared with traditional manually adjusted AC bridges, it achieves automatic balance and parameter calculation through single-chip microcontrollers and digital signal processing technology. The core steps are as follows:

Excitation signal output: The instrument has a built-in signal source that outputs a sinusoidal AC signal with precise frequency and amplitude to the device under test (DUT).

Signal acquisition and processing: The tested component will produce impedance characteristic response under AC excitation. The instrument collects the voltage signal at both ends of the component and the current signal flowing through the component, and analyzes the phase difference between the two through a phase detection circuit.

Automatic balance calculation: Compare the collected signal with the internal standard reference signal, and automatically adjust the bridge parameters through digital algorithms until the bridge reaches a balanced state.

Parameter conversion display: Based on the bridge parameters in equilibrium state and combined with the test frequency, calculate the L, C, R values of the tested component, as well as derived parameters such as Q (inductance quality factor, Q=ω L/R) and D (capacitance loss tangent, D=1/Q), and display them directly in numbers.

Precautions for use:

Short circuit calibration or open circuit calibration is required before measurement to eliminate the influence of parasitic parameters on the test line.

When measuring sensitive components, it is necessary to choose an appropriate test level to avoid breakdown of the components.

When measuring at high frequencies, dedicated low loss test lines should be used to reduce signal attenuation and interference.