Research on Field Testing Method of Digital Energy Meters Based on Digital Reference Meter with High Accuracy

The principle of field testing for digital electric energy meters is analyzed, according to which a digital reference energy meter with high accuracy is developed based on high-precision frequency division pulse output technology, algorithm of dot product sum of interpolation re-sampling and high performance DSP. The test method based on the digital reference meter is applied field testing comparing with a set of calibration system. The results of the test prove high accuracy, efficiency and stability.