The high accuracy full automatic AV voltage regulator source is composed of servo motor, control circuit, compensator(orcompen-sated transformer). It has advantages of small volume, light weight, high efficiency, wide voltage stabilizing range, no waveform distortion etc. All products are provided with over-voltage/under-voltage protection, delay(selective)protection, error protection and voltage two-way indication, which makes the function of the product more perfect and reliable. It's suitable in computer network project, electronic instruments, medical equipment, research institute, measurement and test device, factory test board and so on.