... single-phase intelligent meter adopts alternating current sampling techniques, which enables it to measure power in ammeter, voltmeter, single-phase ... is over 600V; ammeter: 5A, current transformers is required when the AC current is over 5A. DC ammeter: 5A, built-in ... the impact of external environment on the meter, offering users a satisfactory product. panel meter digital ampere meters (JYK-42-A)