User Manual PEAK INSTRUMENTS INC
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spectral measurements produce errors that affect the accuracy of absorbance
measurements (in the absorption spectrum of the peak of the more significant )
2.1.3.9. Impact of non-parallel incident, one of the prerequisites ear than the law
is the use of a parallel incident beam to ensure that all beams through the same
thickness of the absorbing medium, when a large deviation from parallelism
when the incident beam, obviously lead to deviations from Beer's law. If the
instrument is in moderate-intensity beam deviation from parallelism, absorbance
measurement error is generally caused by less than 0.5%
2.1.3.10. Photometric scale error, photometric accuracy of the scale that is
transmittance, which directly affects the accuracy of the magnitude of the error
photometric measurements.
2.2. Performance indicators definitions
2.2.1. Optical system: usually refers to the formal structure of the optical system,
at present, domestic and international institutions often used as a photometer
industry type and CT auto collimation two structures;
2.2.2. Wavelength range: means for wavelength photometer can difference
between maximum and minimum values of the test;
2.2.3. Wavelength accuracy means the actual wavelength difference between
the real wavelength and the setting wavelength. Each wavelength photometer to
be in a lot of points to check wavelength accuracy; spectrophotometer
wavelength accuracy is an important technical indicators, it qualitative,
quantitative and structural analysis of the impact is enormous. Way to check
wavelength accuracy of many spectral lines as a standard filter praseodymium,
neodymium, holmium oxide filter, holmium oxide wavelength standard solution,
deuterium lamp or low pressure mercury lamp emission and interference filters
and so on.
2.2.4. Wavelength repeatability: Wavelength Repeatability is the ability of the
instrument to return the original wavelength. It reflects the wavelength drive
mechanism and the stability of the whole instrument;
2.2.5. Spectral bandwidth (sensitivity, resolution): refers to a peak spectral
bands when the slit on the detector detected through a monochromator energy
half-width, expressed in nm wavelength, from another perspective to understand
this concept will more user-friendly: first, the monochromator exit slit represents
not just the physical size or geometry, it also represents the optical sense, this is
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