These modern-day tape measures consolidate the functions of voltmeters, ammeters, and ohmmeters into a single unit.
As one of most widely-used electronic testing instruments, the digital multimeter (DMM) is more commonly known as the modern-day tape measure. But instead of being able to handle a single function (i.e., linear measurement), DMMs consolidate the functions of multiple instruments, such as voltmeters, ammeters, and ohmmeters into one unit.
DMMs are used in electrical engineering design, maintenance, quality control, inspection, and/or any application requiring electrical servicing and diagnostic testing. A basic DMM works with energized and de-energized electrical circuits and measures alternating current (AC), AC voltage, direct current (DC), DC voltage, resistance, continuity, and diodes. Advanced models measure capacitance, frequency, temperature, pressure, and vacuum (special accessories are required for some of these measurements).
When selecting a DMM for a specific application, consider these three points:
Another important consideration to factor in when selecting a DMM is whether it is a True RMS (root mean square) meter or not. True RMS meters allow non-sinusoidal AC signals to be accurately measured. The typical DMM is not a True RMS meter, and the former will produce misleading voltage readings when used to measure anything other than DC signals or pure sine wave AC signals.
Regardless of which multimeter you chose, electrical test equipment should be used with caution, respect, and maintained in accordance with the manufacturer's guidelines. As with all electrical test equipment, individuals using a DMM should receive training in its proper operation.
It’s important to use extreme caution anytime you work with current (AC or DC) and voltage. To avoid catastrophic consequences, an electrical safe work program should be established and followed whenever working with electricity.
The information contained in this article is intended for general information purposes only and is based on information available as of the initial date of publication. No representation is made that the information or references are complete or remain current. This article is not a substitute for review of current applicable government regulations, industry standards, or other standards specific to your business and/or activities and should not be construed as legal advice or opinion. Readers with specific questions should refer to the applicable standards or consult with an attorney.
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