电桥的概念：用比较法测量各种量（如电阻、电容、电感等）的仪器。最简单的是由四个支路组成的电路。各支路称为电桥的“臂”。如图电路中有一电阻为未知（R2），一对角线中接入直流电源U，另一对角线接入检流计G。可以通过调节各已知电阻的值使G中无电流通过，则电桥平衡，未知电阻R2=R1·R4/R3。 The concept of electric bridge: measuring various quantities (such as resistance, capacitance, inductance, etc.) by comparative method. The simplest is a circuit composed of four branches. Each branch is called the "arm" of the bridge. In the diagram circuit, there is a resistance to the unknown (R2), which is connected to the dc power in the diagonal, and the other diagonal to the galvanometer G. By adjusting the value of each known resistance, the electric bridge is balanced, the unknown resistance R2 is R1, R4 / R3. 电桥测试仪种类：一般分为便携式和台式测试仪两种。其中全自动电容电桥测试仪目前较为常用。全自动电容电桥测试仪简称电容电桥测试仪，英文名称：Automatic Capacitance Bridge Tester 或 Capacitance Bridge Tester，主要解决在变电站现场测量电容器的电容值时存在的问题，如现场测量电容器需拆除连接线，不仅工作量大而且易损坏电容器；电压表输出电压而导致故障检出率低。电桥测试仪一般用于测试电感和电容。 The type of electric bridge test instrument: it is divided into portable and table tester. Fully automatic capacitance bridge tester is more commonly used. Automatic Capacitance Bridge Tester is referred to as "Capacitance Bridge Tester, English name: Automatic Capacitance Bridge Tester or Capacitance Bridge Tester, mainly to solve the Capacitance in the measurement at the scene of the substation capacitors when problems, such as field measurement capacitor need dismantling cables, not only the workload and easy to damage the capacitor; The output voltage of the voltmeter leads to a low fault detection rate. The bridge tester is used to test the inductance and capacitance. 常用电桥测试仪一般使用步骤： General electric bridge test instrument general usage procedure: 1、设置测试频率 Set the test frequency 2、测试电压或者电流水平 Test voltage or current level 3、选择测试参数，比如Z、Q、LS（串联电感）、LP（并联电感）、CS(串联电容）、CP（并联电容）、D等 Select test parameters such as Z, Q, LS (series inductance), LP (parallel inductance), CS (series capacitor), CP (parallel capacitance), D, etc 4、仪器校准，校准主要进行开路、短路校准，高档的仪器要进行负载校准 Calibration of instrument, calibration of main road, short circuit calibration, high grade instrument for load calibration 5、选择测试夹具 Select the test fixture 6、夹具补偿 6, clamp compensating 7、将DUT放在夹具上开始测试 Put the DUT on the fixture and start the test