نوشته شده توسط:majid dadashvand
AC/AC Adapter - Adapter that has an AC voltage input and an AC voltage output.
AC/DC Adapter - Adapter that has an AC voltage input and an DC voltage output.
Adapter - Electrical device that can take an AC voltage input and transform it into a different (or multiple) AC or DC voltage outputs.
CE - The European mark signifying compliance to low voltage and electromagnetic requirements...
Cord Set - A detachable means to supply electrical energy from the mains supply to an electrical device. It has a connector at each end.
Core Loss - This is the measure of power drawn by the input winding of a unit even when not in use (before load is applied).
Creepage - Creepage is the shortest distance between two conducting parts measured along the surface of the insulating material between them.
cUL - Underwriter's Laboratories has been granted the ability to test and approve electrical devices for use in Canada. Units marked with the cUL mark have been tested by UL for use in Canada (and are fully recognized by Canada).
Current - The measure of current is expressed in AMPs. Current can either flow consistently in one direction (DC current), or can reverse/ alternate directions (AC current).
DC - Current that flows in the same direction between two points.
Efficiency - Ratio of output power compared to input power.
Exciting Current - This is the measure of current drawn through the input winding of a unit even when not in use (before load is applied). Frequency
Measures the number of times that a flow of current changes direction in one second. Expressed as Hertz (Hz). Most North and South American locations operate on an input of 60Hz while most of Europe has a 50Hz input.
Hertz - Measure of frequency. Usually expressed as Hz.
Hi-Pot (High Potential) - Used to confirm if the break-down voltage of a unit's internal insulation exceeds the minimum requirement. Testing is done by applying high voltage between two isolated points such as primary to secondary, primary to ground, or secondary to ground for a very brief period.
Inherently Limited Transformer - Where the secondary short circuit condition after one minute does not exceed 8A for "Class 2" and 150V for "Class 3" (V is maximum no-load condition).
Inrush Current - Peak instantaneous input current drawn by a unit upon the initial application of input voltage.
MTBF - Mean Time Between Failure.
Nominal - Objective for a specified parameter...may not be the actual value measured.
Not-Inherently Limited Transformer - Where an overcurrent protective device is either incorporated in the transformer or is required to be provided in the application. Please refer to UL 1585, Table 27.3 (Current and Power Limitations) and Table 28.1 (Calibration Provisions) for further details.
NRTL - Acronym for "Nationally Recognized Testing Laboratory."
OHM - The ratio of voltage to current is expressed in ohms. This measurement shows the resistance to the AC current flow. Impedance (or the number of measured ohms) between circuits must be matched in certain design situations.
Open Circuit - When a circuit has been broken so that conducting components do not allow for the flow of current, the circuit is said to be open. This condition can either be intentional (to provide protection), or unintentional (such as when a wire breaks).
Overload Protection - Function of a power supply that automatically shuts down the supply in the event of reaching a predetermined excessive output current.
Overvoltage Protection - Function of a power supply that automatically shuts down the supply in the event of reaching a predetermined excessive voltage.
Parallel Circuit - Two or more parallel paths for current flow.
Power Supply Cord - A means of transmitting energy from the mains supply to an electrical device through a flexible electrical cable. A power supply cord is permanently installed in the device being powered, as opposed to a cordset, which is detachable.
Regulation (Line) - The percentage change in the output voltage due to a change in input voltage level. This is usually a measurement of the output deviation as the input voltage is varied from low line to high line.
Regulation (Load) - The percentage change in output voltage due to a change in output loading. This is usually a measurement of the output deviation as the loading is changed from no load to full load.
Resistance - This measurement shows the resistance to the AC current flow measured in ohms.
Series Circuit - A single, continuous path for current flow.
Short Circuit Protection - Function of a unit that limites the output current under short-circuit conditions so that the unit can avoid being damaged.
Temperature Rise - Measure of the heat generated by a unit at a given ambient temperature.
Thermal Protection - A feature that shuts down the unit in the event of excessive thermal (temperature) conditions. Usually accomplished with a one-shot or resettable fuse.
Universal Input - A feature of a power supply to accept a relatively wide range of input voltages. The supply can either automatically adjust for the changed input or have a manual switch to do so.
Volt - Measurement of voltage which is required to move a certain number of electrons from one point to another. When the voltage moves in one direction it is DC volts and when it alternates direction, it is AC volts.
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