What is Line Regulation of a constant voltage power supply?

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Line Regulation of a constant voltage power supply: The change in the static value of DC output voltage resulting from a change in AC input voltage from low line to high line or from high line to low line.

Radiated EMI: Also called radio frequency interference (RFI), EMI is unwanted high frequency energy caused by the noise generators of the adaptors. That portion that is radiated through space is known as radiated EMI. Most radiated EMI measurements are done between 30MHz and 300MHz.
See Conducted EMI
Rated Output Current: Maximum output current that can be continuously drawn from a converter under specified conditions.
Redundant Operation: Parallel configuration of converters used in distributed power system to increase system reliability. Converters may be used in a “N+1” architecture.
Reference: The stable voltage, generally a Zener diode, from which the output voltage of a regulated supply is controlled.
Reflected Ripple Current: See
Regulation: Ability of a converter to maintain an output voltage to within specified limits under varying conditions of input line and output load.
See Linear Regulation
Remote Error Sensing or Remote Sensing: A feature found on most power supplies, which, by means of two extra wires between the supply and the load, permits the power supply to achieve its optimum regulation at the load terminals rather than at the power supply output terminals, thus compensating for the IR drop present in the current carrying leads connecting the load to its power supply. The current through the sensing leads is so small that in spite of the resistance of these leads, their voltage drop is negligible.
Remote Programming: A feature of most power supplies which permits control of the regulated output current or voltage by means of a remotely varied resistance or voltage.
Remote Programming Speed: The time (µsec) required for the output voltage to change from zero volts to within “X” millivolts of the maximum rated output or from the maximum rated output to within “X” millivolts of zero. “X” is specified separately for each model, generally of the same order as the load regulation specification.
Remote Shutdown: See Logic Inhibit/Enable
Resolution: For an adjustable supply, the smallest change in output voltage that can be realized by the adjustment.
Return: The name for the common terminal of the output of a power supply; it carries the return current for the outputs.
Reverse Voltage Protection: A feature that prevents damage to internal components if a reverse voltage is inadvertently applied to the input or output terminals.
Ripple and Noise: The residual AC component which is superimposed on the DC output of a regulated power supply. Ripple and noise may be specified in terms of its RMS or (preferably) peak-to peak value. When the peak-to-peak value is specified, it should be accompanied by the maximum bandwidth of the measuring instrument, typically DC to 20 MHz. Measuring ripple and noise with an instrument that has insufficient bandwidth may conceal high frequency spikes detrimental to the load.

Glossary of power supply terms