Multi meter
![multi meter multi meter](https://m.media-amazon.com/images/I/81y3KDvvgWL._SX342_.jpg)
In our evaluation of these models, we will focus on qualities that bear directly to their functionality-namely precision measurement, reliability, durability, ease of use, auto range, and battery life. Many others, particularly digital models, have more features. However, the best multimeters available today have digital displays.Įach multimeter will do the basic job of measuring voltage, amperage, and resistance. We do not mean to say that an analog meter doesn't have a place in residential and commercial contract work, including HVAC maintenance. We did not include analog multimeters in this review. Given that a digital multimeter depends on batteries, long battery life is a definite plus, as is an auto power shutoff. The computer adds to the cost and requires batteries, but it can perform more complex computations, such as true RMS AC current measurement. For some measurements, analog multimeters offer more accurate readings than their digital counterparts.Ī digital multimeter typically has an LCD display and uses a computer to carry out measurements. They cost less and can detect voltage and current from the power source itself. These analog meters convert the voltage, amperage, or resistance into the rotation of a dial, similar to the speedometer in a car. Consider each one, and ask yourself if it's essential, irrelevant, or something useful but not necessary.Īn analog multimeter remains the more traditional form of a multimeter. Not every multimeter has these features, but those that have them are better positioned to capture the title of Best Multimeter. We summarize some of the more important multimeter features below. Manufacturers offer a variety of digital devices and qualities. Multimeters that measure these three qualities are known as Volt OHM milliammeter or Volt Ohm Meter (VOM) devices.Ī VOM should do more than just measure electrical current, voltage, and resistance to be competitive in the market. For a given voltage, as resistance increases, current decreases. The relationship between voltage, current, and resistance is expressed through Ohm's Law, V-IR. Resistance refers to the ability of a circuit to impede the flow of electrons. If electrons cannot move within a circuit, then a voltage potential will be unable to generate as strong a current. In order to assess circuits fully, a digital or analog multimeter must be able to measure AC voltage, AC current, DC voltage, and DC current. We will discuss the two types of current, AC current and DC current, later in the review. The coherent motion of electrons is called an electric current, and its unit of measurement is the ampere or amp.
MULTI METER FREE
If electrons exposed to voltage are free to move, they will. Some multimeters use non-contact voltage measurements, where only a small amount of electrical current is used for the measurement to protect the device.
![multi meter multi meter](https://www.sourcetronic.com/shop/pub/media/catalog/product/cache/e4d64343b1bc593f1c5348fe05efa4a6/s/t/st_1952_2.png)
The unit of measurement for voltage is, not surprisingly, the volt.Įxposure to high voltage can be dangerous for humans and for electronic equipment. If it is free to move, it will move in the direction of a positive charge. Consider an electron exposed to high voltage as a ball at the top of a steep hill or a fluid under high pressure.
![multi meter multi meter](https://i.ebayimg.com/images/g/N8sAAOSwCadhJjxY/s-l640.jpg)
You could think of voltage as a form of potential energy. The difference in charge exerts a force on charged particles because like charges repel one another. For example, the difference could exist between the power source in a circuit and a wire at another point in the circuit. Voltage refers to the difference in electrical charge between two points.