... distortion, high stability AC power sources,suit for ballast, energy savinglamp,fluorescent lamp etc. ... technology2. Digital wave synthesis, wave feed-back technology, low power distortion3. Controlled and tested by 16 bits MCU, which ... exactly display Voltage5. Current, Power, Power factor, Frequency6. Zero output impedance, equivalent resistance ≤0.17. Insulation for power output to make test safely ...