面板上的报警值小数码管是与表头上的量程相对应的，如果量程改变，则设定的数值也随着改变。
Small alarm digitron on the panel corresponds to the range on meter outfit. If the range changes, setting changes accordingly.
介绍测量表头内阻的两种方法：一为替代法，一为半量程法。
This paper introduces two methods to measure the internal resistance of electric meters, the one is the substitution method and the other is the half range method.
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