TotalFlow XRC6490, Руководство пользователя

Страница: 295 / 342

B-3
TERM DEFINITION
Alkynes Unsaturated hydrocarbons that contain one or more carbon-carbon triple
bonds.
Alphanumeric A character set that contains both letters and digits.
Alternating Current An electric current whose direction changes with a frequency independent of
circuit components.
Aluminum Powder Coating Totalflow aluminum enclosures have a baked-on Powder Coating designed to
our specifications to ensure paint adhesion, weather resistance and durability.
Ambient Compensation The design of an instrument such that changes in ambient temperature do not
affect the readings of the instrument.
Ambient Conditions The conditions around the transducer (pressure, temperature, etc.).
Ambient Pressure Pressure of the air surrounding a transducer.
Ambient Temperature The average or mean temperature of the surrounding air which comes in
contact with the equipment and instruments under test.
Amine (Alkanolamine) Any of several liquid compounds containing amino nitrogen generally used in
water solution to remove, by reversible chemical reaction, hydrogen sulfide
and/or carbon dioxide from gas and liquid hydrocarbon streams.
Ammeter An instrument used to measure current.
Amp See Ampere.
Ampere The unit of electrical current. Also milliamp (one thousandth of an amp) and
microamp (one millionth of an amp). One amp corresponds to the flow of about
6 x 10
18
electrons per second.
Ampere-Hour The quantity of electricity measured in ampere-hours (Ah) which may be
delivered by a cell or battery under specified conditions. A current of one
ampere flowing for one hour.
Ampere-Hour Efficiency The ratio of the output of a secondary cell or battery, measured in ampere-
hours, to the input required to restore the initial state of charge, under specified
conditions.
Amplifier A device which draws power from a source other than the input signal and
which produces as an output an enlarged reproduction of the essential features
of its input.
Amplitude The highest value reached by voltage, current or power during a complete
cycle.
Amplitude Modulation Where audio signals increase and decrease the amplitude of the "carrier wave".
Amplitude Span The Y-axis range of a graphic display of data in either the time or frequency
domain. Usually a log display (dB) but can also be linear.
AMU See Analog Measurement Unit.
AMU/IMV Generic reference to the Measurement unit. See Analog Measurement Unit and
Integral Multivariable Transducer for more definition.
Analog A system in which data is represented as a continuously varying
voltage/current.
Analog Input Data received as varying voltage/current.
Analog Measurement Unit A transducer for converting energy from one form to another. (e.g. Static and
Differential pressure to electrical signals)
Analog Output A voltage or current signal that is a continuous function of the measured
parameter. Data that is transmitted as varying voltage/current.
Analog Trigger A trigger that occurs at a user-selected point on an incoming analog signal.
Triggering can be set to occur at a specific level on either an increasing or a
decreasing signal (positive or negative slope).