YSI NiCaVis 701 IQ NI - Manual (Page 62)

Appendix: Glossary
NiCaVis 70x IQ NI
10 - 2 ba76132e01 03/2013
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.
NO2-N The proportion of nitrogen coming from nitrite.
NO3-N The proportion of nitrogen coming from nitrate.
Zero adjustment Measuring and saving the absorbance spectrum of ultrapure water.
Defines the zero points in the spectrum for all wavelengths. The light
beam is not alleviated at the zero point. The zero point influences the
calculation of the raw value.
Sample matrix Composition of the test sample of different individual substances.
Reference sample Random sample of the test sample for comparative chemical-analyt-
ical laboratory analyses intended for user calibration.
Ultrapure water (H2O
dist.)
Ultrapure water is distilled or deionized water suitable for analysis
purposes.
Raw value The raw value is determined from the spectrum while taking into
account the data from the zero adjustment. The raw value is displayed
on the right side of the measured value in the measured value display.
SAK, SAC Spectral absorption coefficient at a certain wavelength. The SAC 254
value is a measure of the contents of organic compounds.
Spectrum Distribution of the absorbance depending of the wavelength.
With the aid of the zero adjustment and user calibration, the measured
values are calculated from the spectrum.
TOC Abbreviation for total organic carbon. Total amount of organically
bound carbon in water.
UVT Transmission measurement at a certain wavelength.
The UVT-254 value is standardized to 10 mm gap width.