... loading measurement of composite error of low voltage electric energy metering device. 3 sorts of clamp meters can be provided at ... . 4. Current input: built-in current transformer: 1mA~12A, automatic gear shift. Clamp meter: 5A, 10A, 20A, 100A, 200A, 500A, 1000A and ... . Output electric energy pulse: rated range is f=60KHz as automatic constant. It can be set between 1~250000 as hand ...