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Often the display count is just called the count in multimeter specifications. For example, a 5½ digit multimeter can also be specified as a 199999 display count or 200000 display count multimeter.
#Multi meter plus#
Display counts give the largest number, or the largest number plus one (so the count number looks nicer) the multimeter's display can show, ignoring a decimal separator. Specifying "display counts" is another way to specify the resolution. Meaningful high-resolution measurements require a good understanding of the instrument specifications, good control of the measurement conditions, and traceability of the calibration of the instrument. While a digital display can easily be extended in precision, the extra digits are of no value if not accompanied by care in the design and calibration of the analog portions of the multimeter. A 3¾ digit meter can display a quantity from 0 to 3,999 or 5,999, depending on the manufacturer. Such a meter could show positive or negative values from 0 to 199,999.
#Multi meter full#
A 5½ digit multimeter would have five full digits that display values from 0 to 9 and one half digit that could only display 0 or 1. The fractional digit is always the most significant digit in the displayed value. Commonly, a three-quarters digit refers to a maximum value of 3 or 5. For example, the term 5½ digits refers to the number of digits displayed on the display of a multimeter.īy convention, a half digit can display either a zero or a one, while a three-quarters digit can display a numeral higher than a one but not nine. The resolution of a multimeter is often specified in " digits" of resolution. Battery checking (ignoring internal resistance, which increases as the battery is depleted), is less accurate when using a DC voltage scale. Battery checking for simple 1.5 volt and 9 volt batteries.Diodes (measuring forward drop of diode junctions, i.e., diodes and transistor junctions) and transistors (measuring current gain and other parameters).Continuity beeps when a circuit conducts.Temperature in degrees Celsius or Fahrenheit, with an appropriate temperature test probe, often a thermocouple.ĭigital multimeters may also include circuits for:.The frequency range for which AC measurements are accurate must be specified. Current, alternating and direct, in amperes.Voltage, alternating and direct, in volts.They can be used to troubleshoot electrical problems in a wide array of industrial and household devices such as electronic equipment, motor controls, domestic appliances, power supplies, and wiring systems.Ĭontemporary multimeters can measure many quantities. Multimeters may use analog or digital circuits- analog multimeters and digital multimeters (often abbreviated DMM or DVOM.) Analog instruments are usually based on a microammeter whose pointer moves over a scale calibration for all the different measurements that can be made digital instruments usually display digits, but may display a bar of a length proportional to the quantity measured.Ī multimeter can be a hand-held device useful for basic fault finding and field service work or a bench instrument which can measure to a very high degree of accuracy. A typical multimeter may include features such as the ability to measure voltage, current and resistance. A multimeter or a multitester, also known as a volt/ohm meter or VOM, is an electronic measuring instrument that combines several measurement functions in one unit.