It is designed for sodium lamp, mercury lamp and halogen lamp electrical ballast&meets inter/national standard toward ele-test. MEASUR PARAMETER:1. Input: Vrms, Irms(10A), W, PF, Hz, tatal harmonic and 0-50 harmonic components.2. Output: Lamp voltage, lamp current(10A), lamp power, crest factor and oscillatory frequency3. Startup: Measure the changing curve and data of input voltage, current, ...