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Multi-tester - Check Continuity and Ohm Readings If you've ever had a switch, fuse, or other device that quit working and you wondered why, try using a multi-tester to check it out. By turning the setting to ohms, you can check for continuity and see what the value of resistance is.

Sometimes electrical connections become corroded and the resistance climbs. This in turn heats up the connection and usually causes an increase in amperage, causing the use to blow or breaker to trip. These connections are dangerous and should be cleaned or replaced.

Things like fuses will have little or no resistance when you read the resistance through them. A single-pole switch will have infinite resistance through the connections in the "off" position and no resistance in the "on" position." Testing continuity with a multi-tester can come in very handy in this instance.

Photo: Timothy Thiele

Comments

November 7, 2008 at 10:14 pm
(1) Dave Rongey says:

Hey Tim, great entry for continuity!
The digital meter is also great for checking AC Voltage in homes. There are times when a home may loose full power and the digital meter is great for identifying and pin pointing the exact problem area. For example: when half of the electrical service is lost a passing of voltage through large appliances such as a clothes dryer will feed power back through its 240 Volt heating elements which will back feed partial power to the “dead” side of the electrical service. This typically creates dim lights due to a low voltage condition. An electrician should be called to identify the exact problem and make the necessary repairs.
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April 12, 2011 at 8:16 pm
(2) Dorie says:

Home run! Great suglgign with that answer!

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