Growler Test for an Open Coil

Introduction to Growler Test for an Open Coil

To find an open coil along with a growler, set up the armature on the growler on the growler in the general way. Test the top two adjacent bars with an AC milli- voltmeter as displayed in the diagram below.

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Rotate the armature and carry on testing the adjacent bars. While the milli-voltmeter bridges the 2 bars associated to the open coil, the meter pointer will not deflect. Rest of the all bars will provide a deflection. This test for an open coil can be finished without the meter through shorting the two tops bars along with a piece of wire.

Nonexistence of a spark points out that the coil is open. The open might be either at the commutator bar or in the coil. The process may be employed to ascertain the location of the loads of a shorted coil. Though, the hacksaw blade test is the most satisfactory method of ascertaining a shorted coil.

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