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The accuracy of a digital tester is defined as the difference between the reading and the true value for a quantity measured in reference conditions.

In electronics an analog-to-digital converter (ADC) is a system that converts an analog signal into a digital one.

In physics, the angular velocity is defined as the rate of change of angular displacement and is a vector quantity (more precisely, a pseudovector) which specifies the angular speed (rotational speed) of an object and the axis about which the object is rotating.

Since it was founded in 1918, the American National Standards Institute (ANSI) has coordinated the development of voluntary consensus standards in the United States and has represented the needs and views of U.S. stakeholders in standardization forums around the globe. ANSI is the U.S. member body to ISO and, via its U.S. National Committee, the International Electrotechnical Commission (IEC). ANSI is also a member of the International Accreditation Forum (IAF).

Base unit
Measurement unit that is adopted by convention for a base quantity. For example: The International System of Units (SI) defines seven units of measure as a basic set from which all other SI units are derived.

Best in Test
The Best in Test awards are presented annually by the editors of Test & Measurement World. These awards honor important and innovative new products and services in the electronics test and measurement industry.

The international organization established by the Metre Convention, through which Member States act together on matters related to measurement science and measurement standards...

The set of operations that establish, under specified conditions, the relationship between values of quantities indicated by a measuring instrument or measuring system, or values represented by a material measure or a reference material, and the corresponding values realized by standards.

The set of interrelated or interacting elements necessary to maintain the measurement performance of measuring and test equipment to defined requirements.

Derived unit
Measurement unit for a derived quantity. Examples: the metre per second (m/s) and the centimeter per second (cm/s) are derived units of speed in the SI. The kilometre per hour (km/h) is a unit of speed outside the SI but accepted for use with the SI. The knot, equal to one nautical mile per hour, is a unit of speed outside the SI.

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