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5790B
Service Manual
Normal Mode Noise
An undesired signal that appears between the terminals of a device.
Offset Error
Same as zero error. The reading shown on a meter when an input value of zero
is applied is its offset or zero error.
Parameters
Independent variables in a measurement process such as temperature, humidity,
test lead resistance, etc.
Precision
The degree of agreement among independent measurements of a quantity under
specified conditions. The precision of a measurement process is its coherence or
repeatability. Note that while precision is necessary for accuracy, it does not
imply it.
Predictability
A measure of what is known of the time-behavior of a device. A documented drift
rate with understood characteristics (e.g., linear, exponential) can be highly
predictable.
Primary Standard
A standard defined and maintained by some authority and used to calibrate all
other secondary standards.
Process Metrology
Tracking the accuracy drift of calibration and other equipment by applying
statistical analysis to correction factors obtained during calibration.
Random Error
Any error which varies in an unpredictable manner in absolute value and in sign
when measurements of the same value of a quantity are made under effectively
identical conditions.
Range
Stated upper limits of measurement or source values for which given uncertainty
specifications apply. Also see "overrange" and "scale".
Reference Standard
The highest-echelon standard in a laboratory; the standard that is used to
maintain working standards that are used in routine calibration and comparison
procedures.
Relative Uncertainty
Uncertainty specifications that are relative to a reference value, and not traceable
to national standards. Also see "absolute uncertainty".
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