How Do You Test The Ballasts In Fluorescent Light Fixtures?
Testing the ballast of a fluorescent light fixture is a basic process that can be accomplished quickly once you understand the operation of the high voltage transformer. The high voltage transformer is also encased in an oil bath that reduces the heat created by the action of the transformer. A low voltage, generally 120 VAC, is transformed into a high voltage, generally in thousands of volts. There must be a continuity between the wires of the high voltage side in order for the circuit to operate correctly. Heat can damaged the internal connections of the ballast. By using a volt ohmmeter the internal circuit can be quickly checked. Remove the electrical power from the light fixture and allow a few minutes to pass. This will allow any stored current in the ballast to be dissipated in the lighting circuit. Remove the fluorescent light bulbs from the end light holding fixtures also called the tombstones. Set the bulbs in a safe place so they do not break. Use the screwdriver and remove
