YSI IQ S ENSOR N ET NitraVis 70x IQ - Manual (Page 55)

NitraVis 70x IQ
Appendix: Glossary
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10 Appendix: Glossary
Resolution Smallest difference between two measured values that can be
displayed by a meter.
Absorbance
(Absorption)
Attenuation of the light beam when it penetrates the sample.
Adjusting To manipulate a measuring system so that the relevant value (e. g. the
displayed value) differs as little as possible from the correct value or
a value that is regarded as correct, or that the difference remains
within the tolerance.
Calibration Comparing the value from a measuring system (e. g. the displayed
value) to the correct value or a value that is regarded as correct.
Often, this expression is also used when the measuring system is
adjusted at the same time (see adjusting).
Calibration value pair Value pair consisting of the raw value measured by the UV-VIS
sensor, and a reference value measured e. g. by a laboratory deter-
mination. The calibration value pairs are the result of the user calibra-
tion.
Concentration Mass or amount of a dissolved substance per volume, e. g. in g/L or
mol/L.
Measuring system The measuring system comprises all the devices used for measuring,
e. g. measuring instrument and sensor. In addition, there is the cable
and possibly an amplifier, terminal strip and armature.
Measured parameter The measured parameter is the physical dimension determined by
measuring, e. g. pH, conductivity or D.O. concentration.
Measured parameter
(correlated)
With the measuring method used, a correlated measured parameter
is not determined directly. A correlated measured parameter can,
however, be derived from a determinable measured parameter. The
precondition for this is that there is a reproducible interrelationship
(correlation) between the determinable and correlated measured
parameter.
Test sample Designation of the test sample ready to be measured.
Measuring gap The measuring gap is between the two measurement windows. In the
measuring gap, the light beam penetrates the test sample.
Measured value The measured value is the special value of a measured parameter to
be determined. It is given as a combination of the numerical value and
unit (e. g. 3 m; 0.5 s; 5.2 A; 373.15 K).
The measured value is determined from the raw value taking into
account the data from a user calibration.
The measured value is displayed together with the raw value in the
measured value display.