简单介绍 the portable standard meter(hereinafter “meter”) is used to calibrate three phase, single phase, active or reactive energy meter under work, and also it can be used as voltage, current and power
dj-3a型三相多功能电能表校验仪英文版the portable standard meter(hereinafter “meter“) is used to calibrate three phase, single phase, active or reactive energy meter under work, and also it can b