It is very important to keep one updated with the continuity if an ohmmeter. It is an electrical instrument that technically measures electrical resistance. The electrical resistance happens to be the opposition to an electric current. For low resistance measurements, microhmmeter would be the right direction for that. For measuring large values of resistance, the right instrument would be megohmmeters. And for resistance, the unit of measurement for that would be ohms.
An Ohmmeter is normally used for checking continuity and the reading are commonly attained using one of its functions either on a digital multimeter or analog volt-ohm-millimeter. This is to verify whether there is any presence of a complete path for electric current through a wire or detecting electrical overload.
A type of ohmmeter that one would claim is more accurate would be the one that has with an electronic circuit that helps to pass a constant current (I) through the resistance, and there’s another circuit that helps to measure the voltage (V) across the resistance.
What you need:
- Digital multimeter
- Schematic for the circuit being serviced
Ohmmeter
Method:
- Firstly, connect your test leads onto the multimeter so that it can get working. Plug the red plug to the red jack and the black plug to the black jack on the surface of the meter. These are all electrical steps right here. It is important to take good notice of where and what to insert.
- Select the Ohms function for the most appropriate Ohms range and this is normally for manual-ranging meter. For an Auto-ranging meter, it will automatically select the proper Ohms range to use accordingly. For checking the continuity of your wire or home appliances, it is recommended that you use the R x 100 range type. Be careful when checking the continuity as it can cause damage, more likely to you.
- Disconnect all power connected to your circuit. The ohmmeter comes with an internal battery for supplying all of its voltage needed for checking a wire or device for continuity.
- Disconnect one end of your wire or one side of testing load from the circuit because if this is not done, the meter may indicate continuity when the component under test is defective, but it still indicates continuity as the meter is reading a complete circuit through the other components in the circuit.
- Place one of the test probes on the end of your disconnected wire while the second probe needs to be moved away from that point, one by one. For circuit that has lost its continuity, the system will automatically display an ‘O.L’ message via its liquid crystal display.
- These are the steps that you should take to check the continuity. In case you don’t think you can work out these steps then it is better to hire a professional to do it for you.
Additional Reading:
