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The digital multi-meter (DMM) is arguably the most useful device an electrician carries. But do you use yours safely?
Your first line of defense is to use only a quality, major American brand DMM. The cheap knock-offs lack the safety features of major American brand DMMs. An example is the terminal post spacing. Any major American brand DMM will have significant separation between the terminal posts. Cheap knock-offs typically pose an arcing hazard due to insufficient spacing.
You also need to be using a DMM that’s rated for the Category of use. Using a hobbyist’s Cat I meter on Cat III industrial busway is just asking for trouble. If you’re not sure whether a given DMM is suitable for the work you do, ask your electrical distributor for advice.
Assuming you’ve got the right DMM to begin with, follow these usage tips:
Ensure accurate readings by replacing the battery if the battery indicator shows low battery, especially if you’re using the DMM to test for proper lockout.
Source: Mark Lamendola | Mindconnection