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Terms for subject Metrology (318 entries)

non-hazardous area	An area in which an explosive gas atmosphere is not expected to be present in quantities such as to require special precautions for the construction, installation and use of electrical apparatus
nonconformity	The absolute value of maximum deviation between the calibration curve and the specified characteristic curve
normal operating condition	The range of operating conditions within which a device is designed to operate within specified accuracy limits
normal operating range	The range of operating conditions within which a device is designed to operate and for which the influence quantities are stated
normal operating temperature	The range of ambient temperatures within which the measuring equipment is designed to operate within specified accuracy limits
NMR standard	nuclear magnetic resonance standard
open system interconnection	ISO standard describing the seven layer model of data communication
operating condition	Specification of the conditions under which the measuring equipment can be operated within its specified accuracy limits and without permanent impairment of its operating characteristics
operating range	The range of operating conditions within which a device is designed to operate and for which the influence quantities are stated
operating temperature range	The range of temperatures within which a device is designed to operate within specified accuracy limits
ordering information	Specification of the information required for the procurement of the measurement equipment. Normally, the information is summarised in the form of an ordering table. Details of the equipment type, software and firmware version as well as the order number should be given
outlet run	Portion of the conduit upstream and downstream of the primary, whose axis is straight and in which the crosssectional area and shape are constant
output	Specification of the output signal which is the information signal delivered after the processing of the measured variable. For analogue and digital equipment, the size of output signal indicates unequivocally the size of the measured variable. For binary outputs, the output signal indicates the state of the measured variable
output signal	The type and characterising quantities of the output signal. The output signal might be electrical, mechanical, hydraulic, pneumatic, optical, digital etc. It may be variable over a specified range or assume specific values only. It the output is configurable, the possible operating modes should be described. If the output of a device, element or system is a foreign system interface, then the physical layer, transmission rate, transmission protocol and primary information parameters should also be specified
output span	The algebraic difference between the upper range-value and lower range-value of the output signal range
overload limit	The maximum input that can be applied to a device without causing damage or permanent change in performance
overrange limit	The maximum input that can be applied to a device without causing damage or permanent change in performance
overshoot	For a step response, the maximum transient deviation from the final steady-state value of the output variable, expressed in % of the difference between the final and the original steady-state values
pick-up	The primary element of a measuring chain which converts the input variable into a signal suitable for measurement
point drift	The change in output over a period of time for a constant input under specified reference operating conditions