Introduction of product: DK-56A1 adopts the technology of advanced large-scale integrated circuit, CPLD, large-scale integrated power amplifier, etc. To design. The product is with high integrated, reliable and stable performance that true of testing and calibrating indicating meter, multi-meter, etc. Equipped with standard coil, also can calibrate all AC/DC current clamp meter that below 0.5 grade. It is suitable for power system of all levels metrology section, national and local bureau of technical supervision, every type of enterprises, etc. Main Features: (1) Adopt excellent closed-loop control, set point software adjustment for one-time, convenient to use. (2) Large power output, small volume, multi-range, strong function. (3) Output widely range: DC voltage: 75mV ~ 1050V, AC voltage: 3V ~ 750V, AC current: 20mA ~ 120A, DC current: 10uA ~ 60A. (4) Voltage, current, power, phase and frequency adopt closed-loop output, complete set point for one-time, simple, convenient and quickly to use. (5) Equipped with all protection function, range stored program control switching, safe and reliable to use. (6) with RS232 interface and interface commands, open protocol, customers can self-operate program and control instrument.