Testboy TV 216N Mode D'emploi page 48

Operation
Measuring transformer, tong jaws
Record the current flowing through the conductor.
Observe the marks "+" and "-" on the flow jaws to determine
the direction of current (only DC measurements).
Enclose the conductor through to be the measured
current flows, pay attention to proper closure of the jaws
and that there are no foreign bodies in the air gap
located between the jaws connections.
Connections
Input: Input for accepting the red test lead for voltage,
resistance and throughflow measurements.
COM: Common input for accepting the black test lead for
voltage, resistance and throughflow measurements.
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Testboy TV 216N