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Terms for subject Metrology (318 entries)

calibration	The set of operations which establish the relationship under specified conditions between the quantities measured and corresponding values of the output of the device
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
cell	Transparent sample vessel for the determination of concentration by colorimetric or turbidity comparison methods
CGS system	centimeter-gram-second system
centimeter-gram-second unit	cgs unit
certificate of compliance	Certificate in which the manufacturer confirms that the products supplied comply with the agreements made on ordering, but without the listing of the results
certificate of conformity	A document issued by an independent officially recognised body or organisation stating that the pertinent specifications of a device or system comply with the specific requirements as laid down in an officially designated document, e.g. PTB certificates for explosion protection
certificate of origin	Certificate signed by a chamber of commerce confirming the origin of goods
certified instrument	Instruments which have been calibrated, sealed and approved by the authorities
CGS system	centimeter-gram-second system
centimeter-gram-second unit	cgs unit
characteristic	A line which shows the values, in steady state, of an output variable of a system or device as a function of the input variable, the other input variables being maintained at specific constant values. When the other input variables are treated as parameters, a set of characteristic curves is obtained
characteristic curve	A line which shows the values, in steady state, of an output variable of a system or device as a function of the input variable, the other input variables being maintained at specific constant values. When the other input variables are treated as parameters, a set of characteristic curves is obtained
C-A thermocouple	chromel-alumel thermocouple
Class I, II or III equipment	Classification of protective measures for current carrying components
climate class	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
closed-control loop	A combination of control units in which the process variable is measured and compared with the desired value (set point) If the measured value differs fom the desired value, a corrective signal is sent to the final control element to bring the controlled variable to the proper value
CMC	Calibration and Measurement Capabilities	carp
Commutec transmitter	Intelligent E+H transmitters
conformity	The closeness with which a calibration curve approximates to a specified characteristic curve (which can be linear, logarithmic, parabolic, etc.) It is usually measured in terms of nonconformity and expressed as conformity