Figure 81. External Voltmeter Measurement Error on CC Power Supply
CC Source Effect (Line Regulation)
Definition: The change ∆ IOUT in the steady state value of dc output current due to a change in ac input voltage over the specified range from low line (e. g., 104 volts) to high line (e. q., 127 volts), or from high line to low line.
Measurement is accomplished by turning the variable autotransformer of Figure 79 through the specified input voltage range and noting the change in the reading on a digital voltmeter or differential voltmeter connected across the current monitoring resistor; this change, when divided by the value of the current monitoring resistor, yields the change in output current. The power supply will perform within its source effect specification at any rated output current combined with any rated output voltage.
CC Load Effect (Load Regulation)
Definition: The change ∆ IOUT in the steady state value of dc output current due to a change in load resistance from short circuit to a value which yields maximum rated output voltage.
Load effect is measured by closing or opening the switch in Figure 79 and noting the resulting static change on the digital voltmeter or differential voltmeter connected across the current monitoring resistor. The power supply will perform within its load effect specifications at any rated output current combined with any rated line voltage.
CC PARD (Ripple and Noise)
Definition: The residual ac current which is superimposed on the dc output current of a regulated supply. PARD may be specified and measured in terms of its rms or (preferably)
The
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