General

Checking For Open Circuits/Short Circuits General




Use a suitable instrument such as a multimeter.

An ohmmeter must not be used for testing components containing semiconductors, e.g. control modules and time delay relays, etc.

The power supply to the system being resistance tested must be disconnected because the instrument will apply a low measuring current to the circuit.

This will ensure that there is no current already present in the circuit so that a reliable reading can be obtained.