www.megger.com11Operation AVO® 2154.4 AC Current measurements G Do not make 20 A current measurements for longer than 30 seconds.Exceeding 30 seconds may cause damage to the meter and /or test leads.1. Insert the black test lead plug into the negative COM socket.2. For current measurements up to 6000 μA AC, set the function switch to the μA position and insert the red test lead plug into the μA / mA socket. For current measurements up to 600 mA AC, set the function switch to the mA position and insert the red test lead plug into the μA / mA socket. For current measurements up to 20 A AC set the function switch to the 10 A position and insert the red test plug into the 10 A socket.3. Press the MODE button to indicate AC on the display.4. Remove power from the circuit under test, then open up the circuit at the point where the measurement is to be made.5. Apply the black test probe and red test probe to either side of where the circuit has been opened.6. Apply power to circuit.7. Read the displayed current.4.5 Resistance measurements F To avoid electric shock, disconnect power to circuit under test and discharge all capacitors before taking any resistance measurements.1. Set the function switch to the CAP position.2. Insert the black test lead plug into the negative COM socket.3. Insert the red test lead plug into the positive socket.4. Repeatedly press the MODE button until is indicated on the display.5. Connect the test lead probes across circuit or part under test. (It is recommended to disconnect one side of the part under test, so the rest of the circuit does not interfere with the resistance measurement).6. Read the displayed resistance.
