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Glossary of terms used on this site

There are 823 entries in this glossary.
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Term Definition
Lag

1.A time delay between the output of a signal and the response of the instrument to which the signal is sent. 2.A time relationship between two waveforms where a fixed reference point on one wave occurs after the same point of the reference wave.

Laminar Flow

Streamlined flow of a fluid where viscous forces are more significant than inertial forces, generally below a Reynolds number of 2000.

Large Scale Integration (LSI)

The combining of about 1,000 to 10,000 circuits on a single chip. Typical examples of LSI circuits are memory chips and microprocessor.

Latching (Meter Relays)

A condition that requires the manual reset of a tripped relay. The tripped relay cannot be reset (re-energized) until the indicating pointer or display is in a non-alarm position.

Latency

The delay time between the end of one communication and the start of another. During this time, the processes associated with the communication are hung up and cannot continue. Software engineers work to reduce latency to a minimum.

Latent Heat

Expressed in BTU per pound. The amount of heat needed (absorbed) to convert a pound of boiling water to a pound of steam.

Lead Compensation

Technique for minimizing or eliminating errors due to signal leads.

Leakage

(Control Valve Functions and Characteristics Terminology) (See Seat Leakage.)

Leakage Rate

The maximum rate at which a fluid is permitted or determined to leak through a seal. The type of fluid, the differential Limits of Error: A tolerance band for the thermal electric response of thermocouple wire expressed in degrees or percentage defined by ANSI specification MC-96.1 (1975).

Least-Significant Digit (LSD)

The rightmost active digit of a digital display.

Least-squares Line

The straight line for which the sum of the squares of the residuals (deviations) is minimized.

Legacy Systems

Computer systems or application programs which are outdated and incompatible with other systems, but are too costly to replace or redesign. They are often large, intimidating, and difficult to modify.

Life Cycle

The minimum number of pressure cycles the transducer can endure and still remain within a specified tolerance.

Limits of Error

A tolerance band for the thermal electric response of thermocouple wire expressed in degrees or percentage defined by ANSI specification MC-96.1 (1975).

Line Rejection

Insensitivity to a power line frequency interference signal. Usually expressed in dB.

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