1>. Working Principle: Linear photoelectric isolation. 2>. Usage: Used for measuring input signal frequency variation and input waveform.AC DC universal. 3>. Advantages: Better cost performance, fast response, high precision, good stability, small size, light weight, easy installation. 4>. Application: Measurement of distortion waveforms such as triangular wave, trapezoidal wave and thyristor adjustable (true RMS output). 5>. The input, output, power and outer shell are isolated, with strong anti-interference ability and high reliability. Full channel configuration,Parameter customizable.