VOM vs. Multimeter
5. Clarifying Terminology
Okay, let's address something that often confuses people: the terms VOM and multimeter. Historically, a VOM (Volt-Ohm-Milliammeter) was an analog device with a needle that moved across a scale to indicate the measurement. A multimeter is a more general term that encompasses both analog and digital instruments capable of measuring voltage, resistance, and current. Basically, a VOM is a type of multimeter.
Modern digital multimeters (DMMs) have largely replaced analog VOMs due to their greater accuracy, ease of use, and additional features. DMMs typically have a digital display that shows the measurement value, as well as functions like auto-ranging, continuity testing, and diode testing. However, the underlying principles are the same: they both measure voltage, resistance, and current.
Think of it like comparing a classic car to a modern car. Both can get you from point A to point B, but the modern car has more advanced technology and features. Similarly, a DMM is a more advanced version of the original VOM.
So, while the term VOM is still used by some, especially those familiar with older technology, multimeter is the more common and accurate term for the electronic testing tool you're likely to encounter today. No matter what you call it, understanding its purpose and typical settings is crucial for anyone working with electrical circuits.
