TD1880 is a wide-range, high-precision multifunctional calibrator. The instrument has built-in ultra-precision AC and DC voltage and current sources. It can output DC voltage, DC current, DC power and AC voltage, AC current, AC power, phase, frequency with excellent performance. It also has functions such as simulating resistance, capacitance, thermocouple and thermal resistor, and pulse output. It is a special equipment for calibrating 6.5 and below digital multimeters and other precision electrical measuring instruments.