Fluke 5820A, Operator'S Manual

Page: 236 / 272

5820A
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.
control chart
A chart devised to monitor one or more processes to detect the excessive deviation from a
desired value of a component or process.
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 converts 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.
distortion
Undesired changes in the waveform of a signal. Harmonic distortion disturbs the original
relationship between a frequency and other frequencies naturally related to it.
Intermodulation distortion (imd) introduces new frequencies by the mixing of two or
more original frequencies. Other forms of distortion are phase distortion and transient
distortion.
errors
The different types of errors described 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
exhibits very little error throughout its frequency range.