Insulation resistance tester generally refers to megohmmeter (megger) is an electrician commonly used a measurement instrument, mainly used to check electrical equipment, household appliances or electrical lines to ground and phase insulation resistance, in order to ensure that these equipment, electrical appliances and lines work in a normal state, to avoid electric shock casualties and damage to equipment and other accidents.
The meaning of the terminal symbols:
Measurement of insulation resistance, the line "L" and the object to be measured with the earth insulation of the conductive part of the connection, ground "E" and the object to be measured in the shell or grounded part of the connection. Shield "G" and the object to be measured to protect the sheltered part of the connection or other parts not involved in the measurement of the connection.
To eliminate errors caused by meter leakage. Measurement of insulation resistance between the components of electrical products, can be "L" and "E" end connected to any set of wires. Such as the measurement of generator phase insulation, three groups can take turns exchanging, vacant a corresponding safety grounding.