Dimmer Switch: Testing and Inspection

Rheostat Inspection

Rheostat Inspection <Mechanical Type>:

Mechanical Type
1. With the connector disconnected, measure the continuity between the rheostat terminals with an ohmmeter.

2. If the resistance value varies smoothly between 0 and 10 ohms throughout the entire operation range, the rheostat is functioning properly.

Rheostat Inspection <Electronic Type>:

Electronic Type
1. Connect the battery and the test bulb (40W) as shown in the illustration.

2. Operate the rheostat, and if the brightness changes smoothly without switching off, then the rheostat function is normal.