Terms that are on use on this site.
There are 493 entries in this glossary.C
| Term | Definition |
|---|---|
| Client-Server Network |
A network that uses a central computer (server) to store data that is accessed from other computers on the network (clients). |
| Client/server architecture |
an approach to co-operative processing, where the functions of an
application are shared between multiple computers on a network. |
| Clipping |
The term applied to the phenomenon which occurs when an output signal
is limited in some way by the full range of an amplifier, ADC or other
device. When this occurs, the signal is flattened at the peak values,
the signal approaches the shape of a square wave, and high frequency
components are introduced. Clipping may be hard, as is the case when
the signal is strictly limited at some level; or it may be soft, in
which case the clipping signal continues to follow the input at some
reduced gain. |
| Closed |
loop control -any system in which part of the output is fed back to the input to effect a regulatory action, and in which the controlled quantity is measured and compared with a standard representing the desired performance. Any deviation from the standard is fed back into the control system in such a sense as to reduce the deviation. |
| Closeness of Control |
Total temperature variation from a desired set point of system. Expressed as "closeness of control" is ±2?C or a system bandwidth with 4?C, also referred to as amplitude of deviation. |
| CNC |
Computer Numerical Control allows the control of motion in an accurate
and programmable manner through use of a dedicated computer within a
numerical control unit, with a capability of local data input such that
machine tools are freed from the need for "hard-wired" controllers. |
| Coaxial cable |
a physical network medium that offers large bandwidth and the ability to support high data rates with immunity to electrical interference and a low incidence of errors. |
| COBOL |
Common Business Oriented Language is a programming language commonly used for data processing. |
| Colour Code |
The ANSI established colour code for thermocouple wires in the negative
lead is always red. Colour Code for base metal thermocouples is yellow
for Type K, black for Type J, purple for Type E and blue for Type T. |
| COM |
Component object model |
| Common Cause |
Predictable normal random variation present in every process due to the combination of existing inputs. |
| Common Mode |
The output form or type of control action used by a temperature
controller to control temperature, i.e. on/off, time proportioning, PID. |
| Common Mode Rejection Ratio |
The ability of an instrument to reject interference from a common voltage at its input terminals with relation to ground. Usually expressed in db (decibels). |
| Communication link |
the mechanism for information transmission. |
| Commutation |
Sequential excitation of motor windings to maintain the relative phase angle between the rotor and stator magnetic fields, within specified limits, to control motor output. In brush dc motors, this function is accomplished by a mechanical commutator and carbon brushes; in brushless motors, it's done electronically using rotor position feedback. |
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