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ABSOLUTE ACCURACY:

The correctness of the indicated value in terms of its deviation from the true or absolute value.

AC:
In text, use lower case: ac. Abbreviation for Alternating Current.

AC BROWNOUT:
The condition that exists when the ac line voltage drops below some specified value.

AC LINE:
The set of conductors that route ac voltage from one point to another.

AC LINE FILTER:
A circuit filter placed in the ac line to condition or smooth out variations that are higher in frequency than the line frequency.

ALTERNATING CURRENT:
(ac) A periodic current the average value of which over a period is zero. Unless distinctly specified otherwise, the term refers to a current which reverses at regularly recurring intervals of time and which has alternately positive and negative values.

AMBIENT TEMPERATURE:
The average temperature of the environment immediately surrounding the power supply. For forced air-cooled units, the ambient temperature is measured at the air intake. See also Operating Temperature, Storage Temperature, Temperature Coefficient.

AMPERE:
(A) Electron or current flow representing the flow of one coulomb per second past a given point in a circuit.

AMPLIFIER:
A circuit or element that provides gain.

AMPLIFIER, DC:
A direct coupled amplifier that can provide gain for zero-frequency signals.

AMPLIFIER, DIFFERENTIAL:
An amplifier which has available both an inverting and a noninverting input, and which amplifies the difference between the two inputs.

AMPLIFIER, INVERTING:
An amplifier whose output is 180° out of phase with its input. Such an amplifier can be used with degenerative feedback for stabilization purposes

AMPLIFIER, NONINVERTING:
An amplifier whose output is in phase with its input.

AMPLIFIER, OPERATIONAL:
A dc amplifier whose gain is sufficiently large that its characteristics and behavior are substantially determined by its input and feedback elements. Operational amplifiers are widely used for signal processing and computational work.

ANODE:
1) (electron tube or valve) An electrode through which a principal stream of electrons leaves the interelectrode space. 2) (semiconductor rectifier diode) The electrode from which the forward current flows within the cell. (IEEE Std 100-1988)

ANSI:
Abbreviation for American National Standards Institute

APPARENT POWER:
Power value obtained in an ac circuit as the product of current times voltage.

ARC:
A discharge of electricity through a gas, normally characterized by a voltage drop in the immediate vicinity of the cathode approximately equal to the ionization potential of the gas. (IEE Std 100-1988)

ASYMMETRICAL WAVEFORM:
A current or voltage waveform that has unequal excursions above and below the horizontal axis.

ATTENUATION:
Decrease in amplitude or intensity of a signal.

AUTHORIZED PERSON:
A qualified person who, by nature of his duties or occupation, is obliged to approach or handle electrical equipment or, a person who, having been warned of the hazards involved, has been instructed or authorized to do so by someone in authority.

AUTO TRANSFORMER:
A single winding transformer with one or more taps.

AUTOMATIC CROSSOVER:
The characteristic of a power supply having the capability of switching its operating mode automatically as a function of load or setting from the stabilization of voltage to the stabilization of current. The term automatic crossover power supply is reserved for those units having substantially equal stabilization for both voltage and current. Not used for voltage-limited current stabilizers or current-limited voltage stabilizers. See also CROSSOVER POINT.

AUTOMATIC GAIN CONTROL (AGC):
A process or means by which gain is automatically adjusted in a specified manner as a function of input or other specified parameters. (IEEE Std 100-1988)

AUXILIARY SUPPLY:
A power source supplying power other than load power as required for the proper functioning of a device.

AWG:
Abbreviation for American Wire Gauge.