... -3020A 3P Meter Calibrator is designed in accordance with related national standards & regulations. Without matching an ... positions: 30V, 100V, 200V, 400V, 600V, with fine regulation 0.01%, each step has 20% allowance;3.2. ... 1A, 2.5A, 5A, 10A, 20A, with fine regulation 0.01%, each step has 20% allowance;3.3. ... Frequency output range: 45~65Hz, with fine ...