Agilent Technologies 90B manual DC Output of Power Supply Superimposed Pard Component

TYPICAL OUTPUT IMPEDANCE OF A CONSTANT

VOLTAGE POWER SUPPLY

PARD (RIPPLE AND NOISE)

The term PARD is an acronym for "Periodic and Random deviation" and replaces the former term ripple and noise. PARD is the residual ac component that is superimposed on the dc output voltage or current of a power supply. It is measured over a specified bandwidth, with all influence and control quantities maintained constant. PARD is specified in rms and/or peak-to-peak values over a bandwidth of 20Hz to 20MHz. Fluctuations below 20Hz are treated as drift. Attempting to measure PARD with an instrument that has insufficient bandwidth may conceal high frequency spikes that could be detrimental to a load.

DC OUTPUT OF POWER SUPPLY AND

SUPERIMPOSED PARD COMPONENT

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