Appendices
Glossary
D
D-11
verification
Checking the functional performance and uncertainty of an instrument or standard
without making adjustments to it or changing its calibration constants.
voltage guard
A floating shield around voltage measurement circuitry inside an instrument. The voltage
guard provides a low-impedance path to ground for common-mode noise and ground
currents, thereby eliminating errors introduced by such interference.
working standard
A standard that is used in routine calibration and comparison procedures in the
laboratory, and is maintained by comparison to reference standards.
zero error
Same as offset error. The reading shown on a meter when an input valueof zero is applied
is its zero or offset error.
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