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Terms for subject Metrology (318 entries)
indirect measuring method A method of measurement in which the value of a measured variable is obtained by measurement of other quantities functionally related to the measured variable. Example: Measurement of a pressure by a column of liquid
indirect method of measurement A method of measurement in which the value of a measured variable is obtained by measurement of other quantities functionally related to the measured variable. Example: Measurement of a pressure by a column of liquid
direct method of measurement A method of measurement in which the value of a measured variable is obtained directly, rather than by measurement of other quantities functionally related to the measured variable. Note: The method of measurement remains direct even if it is necessary to make supplementary measurements to determine the values of influence quantities in order to make corresponding corrections. Example: Measurement of a length using a graduated rule
X-ray test A non-destructive material test that allows assessment of the quality of a material or weld
dye penetration test A non-destructive material test that gives information about the presence of fissures, overlaps, folds, pores and bonding faults in the surface of a material
ultrasonic test A non-destructive material test that gives information about the presence of inclusions or cavities beneath the surface of a material
protocol A protocol is a set of conventions relating to the data format and control procedures necessary for communication between two devices or processes
variable A quantity or condition whose value is subject to change and can usually be measured
influence quantity A quantity which is not the subject of measurement, but which influences the value of the measured variable of the indication of the measuring instrument, e.g. ambient temperature
measurement influence A quantity which is not the subject of measurement, but which influences the value of the measured variable of the indication of the measuring instrument, e.g. ambient temperature
calibration curve A representation of the relationship between the values of the quantity measured and the corresponding values actually given by the device, under defined conditions
connection compartment A separate compartment or part of a main enclosure, communicating or not with the main enclosure, and containing connection facilities
terminal compartment A separate compartment or part of a main enclosure, communicating or not with the main enclosure, and containing connection facilities
analog signal A signal, the information parameter of which may assume all values in a given range
analogue signal A signal, the information parameter of which may assume all values in a given range
digital signal A signal, the information parameter of which may assume any value out of a set of discrete values which are represented by numbers
standardised signal A signal, the lower and upper range-values of which are standardised, e.g. 4...20 mA
ambient condition A specification of surrounding parameter values necessary for the protection or proper operation of a function unit. The condition is usually specified as a nominal value and a tolerance range
environmental condition A specification of surrounding parameter values necessary for the protection or proper operation of a function unit. The condition is usually specified as a nominal value and a tolerance range
shock A sudden nonperiodic motion caused by a blow, impact, collision, concussion or violent shake or jar. There are two methods used to quantify and measure shock: specification of a value of acceleration and deceleration together with its duration specification of a height or free fall on to a specified flat surface