... it is the best tool to check meter on-site.DFC~300 calibrator adopts Analog to Digital Conversion (ADC) be the fundamental ... ). 5. Provided with fundamental harmonic measurement mode to realize calibration of fundamental meter. 6. Provided with two electric energy pulse ... and have amplification function. 13. Users can, according to demand, select clamp meter with 5A, 10A, 100A, 200A, 500A, 1000A, ...