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Terms for subject Metrology (318 entries)

quantisation	Process by which the range of a variable is divided into a finite number of distinct subranges, not necessarily equal, each of which is represented by an assigned value named the quantized value
RACKBUS®	Registered trademark of Mestra AG, Reinach, Switzerland. Proprietary bus for connecting intrinsically transmitters to controlling gateways
RACKBUS® RS-485	Proprietary bus for connecting intrinsically transmitters to controlling gateways
range	The region of the values between the upper and lower limits of the quantity under consideration - usually used with a modifier, e.g. temperature range, measuring range
RBE dose	relative biological effectiveness dose
reapproval	This is the regular check made by the weights and measures office that the instrument is still measuring correctly
reference electrode	Electrode the galvanic voltage of which can be reproducibly set without being influenced by the medium being measured
reference operating condition	The conditions under which the equipment was tested. Reference operating conditions are stipulated operating conditions for testing measurement equipment or the comparison of measured values. They are usually fixed reference values for the influence quantities which are acting upon the measurement equipment
reference signal	Signal which is proportional to the magnetic flux created in the primary device and which is compared in the secondary device with the flow signal
RBE dose	relative biological effectiveness dose
repeatability	The closeness of agreement among a number of consecutive measurements of the output for the same value of the input under the same operating conditions, approaching from the same direction, for full range traverses. Usually expressed as percentage of span and does not include hysteresis or drift
reproducibility	The closeness of agreement among a number of consecutive measurements of the output for the same value of the input under the same operating conditions, approaching from both directions, for full range traverses. Usually expressed as percentage of span and does include hysteresis, dead band and drift, if the time is long enough
resistance to climatic changes	The climatic conditions, i.e. ambient temperature, pressure and humidity, to which the measuring equipment can be subjected during operation (including shutdown) transport and storage
resolution	The least interval between two adjacent discrete details which can be distinguished one from the other. In the case of an instrument with digital output, the term "resolution" is often understood as the smallest change in the output
resonance frequency	The frequency of a sinusoidal input signal which coincides with the inherent frequency of the system thus producing an extra large output
response time	The length of time required for the output of a transducer to rise to a specified percentage of its final value as a result of a step change of measurand
rise time	For a step response, the time interval between the instant when the output signal, starting from zero, reaches a small specified percentage (for instance 10%) of the final steady-state value, and the instant when it reaches for the same time a specified large percentage (for instance 90%) of the same steady state value
RMS detector	root-mean-square detector
root-mean-square voltage	rms voltage
RMS detector	root-mean-square detector