User Manual PEAK INSTRUMENTS INC
5
the spectral bandwidth, we know that the light from the failure of a single
monochromator wavelength, but at a narrow wavelength spectral band are
arranged in the order, the number of spectral wavelength band comprises,
represented by the spectral bandwidth. Spectral bandwidth is a direct response
to the quality level of monochromatic light from the monochromator out. The
index with the instrument resolution and sensitivity are similar, but different, they
react photometer performance quality from different sides. Resolution refers to
the size of the instrument to distinguish two adjacent wavelengths ability
Sensitivity is measured at low concentrations do, when the concentration
changes by one unit to the detector signal caused by the change amount, it is
subject to a calibration curve (standard curve as the horizontal axis, the
absorbance on the vertical axis) and a precision instrument itself restrictions.
Two measurement precision of the method is the same, the greater the
sensitivity calibration curve slope, while the slope equal, the higher the
sensitivity, the better precision. It is noted that, in order to obtain accurate test
results, the natural bandwidth of the spectral bandwidth of the instrument
(Spectral Bandwidth referred SBW) and the analysis of samples (Natural
Bandwidth referred NBW) ratio should be less than 0.1, more than 99.5% can
be obtained so that the measurement accuracy.
2.2.6. Stray light: wavelength of stray light is irradiated onto the non-selection
signal generated by the detector. It is an important source of photometric
analysis of errors, stray light limit the accuracy of the General Assembly high
concentration solution analysis. Stray light represented by T%;
2.2.7. Photometric range: Refers to meet the photometric test range in various
technical indicators, represented by A or T;
2.2.8. Photometric accuracy: the true average value refers to the degree of
compliance with a plurality of measured; photometric accuracy check is usually
through the use of repeated measurements of the neutral density filter carefully
film to a standard photometric detection. A neutral density filter for light in a
wavelength range having almost the same transmittance (or absorbance) of the
filter, and the use of its wavelength insensitive characteristic bandwidth
changes, to check the accuracy of the optical instrument and repeatability.
2.2.9. Photometric Repeatability: refers several times under the same
conditions as measured in parallel, each parallel line with the degree of
determination between the results;
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