... and analysis the data in real time. Central processing part adopts 32bit ARM embedded technology which realizes a novel instrument ... .1. 3. Voltage input: 30V~560V; Four shift: 60V, 120V, 240V, 480V, automatic gear shift. 4. Current input: built-in current transformer: ... 1mA~12A, automatic gear shift. Clamp meter: 5A, 10A, 20A, 100A, 200A, 500A, 1000A ...