5502A
Operators Manual
A-2
buffer
1. An area of digital memory for temporary storage of data.
2. An amplifier stage before the final amplifier.
burden voltage
The maximum sustainable voltage across the terminals of a load.
compliance voltage
The maximum voltage a constant-current source can supply.
control chart
crest factor
The ratio of the peak voltage to the rms voltage of a waveform (with the dc component
removed).
dac (digital-to-analog converter)
A device or circuit that changes a digital waveform to an analog voltage.
dBm
A reference power level of 1 mW expressed in decibels.
derived units
Units in the SI system that are derived from base units. Volts, ohms, and watts are
derived from amperes and other base and derived units.
displacement power factor
Refers to the displacement component of power factor; the ratio of the active power of
the fundamental wave, in watts, to the apparent power of the fundamental wave, in volt-
amperes.
distortion
Undesired changes in the waveform of a signal. Harmonic distortion disturbs the initial
relationship between a frequency and other frequencies naturally related to it.
Intermodulation distortion (imd) introduces new frequencies by the mixing of two or
more initial frequencies. Other types of distortion are phase distortion and transient
distortion.
errors
The different types of errors given in this glossary are “offset error,” “linearity error,”
“random error,” “scale error,” “systematic errors,” and “transfer error.”
flatness
A measure of the variation of the actual output of an ac voltage source at different
frequency points when set to the same nominal output level. A flat voltage source shows
very little error in its frequency range.
A chart made to monitor one or more procedures to sense the radical deviation from a
necessary value of a component or procedure.
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