Adjust the multimeter to AC volt meter by meter on the switch rotation. The range of the measurement voltage DC (ACV), which is the measurement range 4 is 0-10V, 0-50V, 0-250V, 0-1000V, and then select the appropriate measurement range. For the measurement of electric potential difference AC We can continue to gauge which side the line any time, but you can also use a measurement method, the same principle of volt meter DC.
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