What is the difference between multimeter and megger

In this case Voltage is applied across the body whose resistance is to be measured. If the insulation strength is low then there will be current flow through the 'deflection coil' and the resulting torque in the coil will produce deviation in the pointer connected to a permanent magnet.

The torque produced by the two coils will be opposite in nature. Multimeter as the name says is used for a variety of measurements but using basically the same moving coil.

Observe the red color circuit, the terminals are having contact between phase and ground. During the normal condition the insulation resistance will be high, since the lamp does not glow, but during fault condition the lights starts glowing due to the current flows through the fault mouth. Note: While using Those testing devices, the equipment testing to be done should be isolated from the input power supply. The minimum value that will be obtain from the individual equipment to ensure the equipment faulty.

Multimeters are not suitable for testing high voltage application, series test lamp and Megger are suitable for high voltage application. Mulitmere needs 5 Volts battery, Megger does not require any battery equipment analog but for digital Megger it needs 9V battery and series test lamp needs external source.

Multimeter does not require but series test lamp and Megger produces high voltage, touching those terminal in with empty hand, cause electrical shock.

Multi meters and Megger shows the output values on digits but series test lamp shows the value in intensity of the light, The intensity of the test lamp is purely depending on the insulation resistance of the equipment.

Save my name, email, and website in this browser for the next time I comment. Difference Practical Electrical. The moving element may point in any meter position when the generator is not in operation. As current provided by the hand-driven generator flows through Coil B, the coil will tend to set itself at right angles to the field of the permanent magnet.

With the test terminals open, giving an infinite resistance, no current flows in Coil A. Thereby, Coil B will govern the motion of the rotating element, causing it to move to the extreme counter-clockwise position, which is marked as infinite resistance.

Coil A is wound in a manner to produce a clockwise torque on the moving element. The pointer then moves to the extreme clockwise position, which is marked as zero resistance. Resistance R1 will protect Coil A from excessive current flow in this condition. When an unknown resistance is connected across the test terminals, line and earth, the opposing torques of Coils A and B balance each other so that the instrument pointer comes to rest at some point on the scale.