AEMC 5100 User Manual

Megohmmeter Models 5000N/5100/5110- 25 -When the guard terminal isconnected at “B”, theinstrument measures thecurrent “I” and not thesurface leakage current“i1”, which is not included inthe measurement. SeeFigure 9. This type ofmeasurement will give thetrue value of the resistance“Rx”, providing the “Ry”and “Rz” are not too low.Figure 9Voltage Measurements (Safety Check)These instruments can measureAC or DC voltages. For voltagemeasurements, proceed as follows:• The push-to-test button should be in the OFF position.• Connect the instrument with the voltage leads connected between theLine (–) and Earth (+) terminals on the unit.• Read the voltage directly on the voltage scale.+ EARTH— LINEMEGOHMMETERFigure 10A CBRyRzRxi1iTo EARTHTerminalTo LINETerminalTo GuardTerminal