... ideal calibrating equipment for meter makers.2 Main Feature2.1. Digital frequency modulation, phase modulation, amplitude modulation. Intelligently designed, operation is ... 100V, 200V, 400V, 600V, with fine regulation 0.01%, each step has 20% allowance;3.2. Current output steps/positions: 0 ... 5A, 5A, 10A, 20A, with fine regulation 0.01%, each step has 20% allowance;3.3. Frequency output range: 45~65Hz ...