There set up automatic switching device in the Watt - hour meter test bench, which can automatically convert basic error test and DC and even harmonic test connection, replacing test in the process of previous experiments. It realizes the manual connection testing process automation, and improves work efficiency.%在电能表检定装置上设置自动转换装置，可以自动转换基本误差试验、直流和偶次谐波试验的试验接线，代替以往试验过程中的手工接线，实现了试验过程的自动化，提高了工作效率。
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