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Flowmeter directory - Flow controllers terms Category: Electronics and Engineering > Industrial automation Date & country: 16/12/2007, UK Words: 713

Active Filter
An active filter is one that uses active devices such as operational amplifiers to synthesize the filter response function. This technique has an advantage at high speeds because the need for inductors is eliminated.technical glossary, technical terms, glossary, technical glossary

ACRS
Advisory Committee on Reactor Safeguards.technical glossary, technical terms, glossary, technical glossary

Acquisition Time
This term relates to sampling A/Ds which utilize a track/hold amplifier on the input to acquire and hold the analog input signal. Acquisition time is the time required by the T/H amplifier to settle to its final value after it is placed in the track module.

Acoustics
The degree of sound. The nature, cause, and phenomena of the vibrations of elastic bodies; which vibrations create compressional waves or wave fronts which are transmitted through various media, such as air, water, wood, steel, etc.

Accuracy
The combined error of nonlinearity, repeatability, and hysteresis expressed as a percent of full scale output.

Access Protocol
A defined set of procedures that function as an interface between a user and a network and enable the user to employ the services of that network.

Accelerometer
A transducer which converts mechanical motion into an electrical signal that is proportional to the acceleration value of the motion.technical glossary, technical terms, glossary, technical glossary

Acceleration
The first derivative of velocity with respect to time. Units expressed in 'g'.

AC Linearity
A dynamic measurement of how well an A/D performs. In an ideal A/D converter, a pure sine wave on the analog input appears at the digital output as a pure (sampled) sine wave. In the real world, however, spurious signals due to nonlinear distortion within the A/D appear in the digital output. These anomalies are usually combinations of harmonics of…

Absorption(of water vapor)
retention (of water vapor) by penetration into the bulk of a material.technical glossary, technical terms, glossary, technical glossary

Absolute Zero
Temperature at which thermal energy is at a minimum. Defined as 0 Kelvin, calculated to be -273.15 °C or -459.67°F.

Absolute Pressure
Gage pressure plus atmospheric pressure.

Absolute Pressure Transducer
A transducer that has an internal reference chamber sealed at or close to 0 psia (full vacuum) and normally provides increasing output voltage for increases in pressure.