You’ve heard of ohms, maybe even used an ohm calculator on the internet, but do you know what they are? Have you ever used an ohmmeter? Do you know how to test a fuse with an ohmmeter? The team at TigerStop can help you out. In simplest terms, an ohm is a unit of electrical resistance measured between two points on a conductor. At any particular resistance, the voltage will be directly proportional to the current, or ampere. This is where an ohmmeter comes in.
Description and Use of Ohmmeter
As you might expect, an ohmmeter can be used to simply measure ohms. But it can also be part of another, more common, electrical testing device called a multimeter.
An ohmmeter uses a small electrical current to check the continuity of a circuit. However, in different settings, it can also tell how much resistance is in a circuit. You can use an ohmmeter to check continuity in motors, cables, and fuses. If a circuit has a break in continuity, it’s “open” (it has a break in it). On the contrary, a good circuit will be “closed,” or complete.
Ohmmeter settings are selected at the bottom of the dial, indicated by the Greek letter omega: Ω.
Procedure: How to Test a Fuse with an Ohmmeter
- Set your ohmmeter to the lowest scale on the resistance setting. Usually, it will have Ω (Greek letter omega) for resistance.
- When testing a fuse, touch the end of each ohmmeter cable to the opposite ends of the fuse.
- A reading between 0 and 2 indicates continuity—the circuit is good/complete.
- If you read infinity (∞) or OL (open line) the circuit is bad.