... or manually calibrate and test class below 0.5 single-phase & 3-phase AC/DC ammeter, AC/DC voltmeter, and power meter. ... meter(excluding electric energy meter)3 Main Technique Parameter3.1. Voltage output steps/positions: 30V, 100V, 200V, 400V, 600V, with fine regulation ... 0.01%, each step has 20% allowance;3.2. Current output steps/positions ...