1. Built-in digital multiple function standard meter with Integrated structure of meter and power source electrical parameters can be read via software 2. adopts DDS technology CPLD and RAM embedded system featured with high stability of signal source output small fineness low distortion 3. RAM system large color LCD display massive information can be seen directly through screen 4. use PWM digital power amplifier with above 90% efficiency and 300KHz carrier frequency to have advantages of low distortion little heating high efficiency 5. Perfect protection function: voltage short circuit alarm open circuit and over load alarm 6. Built-in OCXO for 50KHz high precision impulse output which can be used to calibrate energy meter clock also can test day error/hour segment error when matching with meter calibration software (optional) 7. With 485 communication interface can do various communications test for universal meters