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5790A
Service Manual
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 cury, 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 charteristics (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
Trking the cury drift of calibration and other equipment by applying statistical analysis to
correction ftors 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 treable to national
standards. Also see "absolute uncertainty".
Reliability
A measure of the probability of failure of an instrument.
Repeatability
See "precision".
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