Q. How should a digital tong tester be used?

Answer

Here are some instructions:First pick DC or AC current if the clamp meter permits it for the circuit need to measure. Set the inarguably on the current's magnitude.Open the clamp meter's jaws and clamp them around the wire. For best accuracy center the wire in the clamp.Clamping the instrument around many wires prevents accurate measurement.Only measure ground wires. If monitoring an AC circuit clamp the device over two single-phase wires or three three-phase wires.Leakage current travels to earth through the load's insulation resistance and can reach many tens of A if multiple loads are connected.