Response Electronics CL6011B Especificaciones Pagina 154

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Original — December 1991
UM4.6:CS6003
Glossary-32
T
TC Abbreviation: Thermocouple
TIM Abbreviation: Timer
Transducer A device that converts one physical variable into another.
Transistor-Transistor- Logic (TTL)
A popular family of integrated circuit devices for logic functions. These
devices have arrays of bipolar transistors in which voltages below 0.7
volts represent a logical 0, and voltages above 2.4 volts represent a
logical 1.
Trip Point [See Alarm Trip Point]
TTL Acronym: Transistor-Transistor Logic
Tuning The adjustment of control terms or parameter values to produce a
desired control effect.
U
UDC Acronym: Unsolicited Data Control
UL Acronym: Underwriters Laboratories
Ultraviolet Light Erasable ROM (UVROM)
Another name for ultraviolet read-only memory.
Ultraviolet Read-Only Memory (UVROM)
A special type of ROM. Exposure to intense ultraviolet light erases the
ROM contents.
Underwriters Laboratories (UL)
An American agency that tests electrical products, approving those that
meet safety guidelines.
Uninterruptible Power Supply (UPS)
A backup device for the AC power source. A UPS connects between the
AC power source and computer equipment. Should there be a failure of
or interruption in the AC power source, the UPS supplies continuous
power to the computer.
Unit 1. A defined group of specific process equipment that processes a
particular batch. For control purposes, such a unit is one entity.
2. A PROVOX point type. A unit point has many attributes, enabling it to
control the execution of a unit operation.
TC - Unit
Glossary
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