Certified Spectrophotometer Evaluation in Your Lab
Each set of SPECTRONIC Standards is individually tested and certified to be accurate, with values traceable to the National Institute of Standards and Technology (NIST).
0% Transmittance
The opaque 0%T Standard is used to test for light leaks in your spectrophotometer.
Stray Radiant Energy
Each of these three Standards is essentially opaque at its test wavelength and highly transmitting at longer wavelengths. The test wavelengths chosen (220 nm, 340 nm, and 400 nm) correspond to points of low energy for both tungsten and deuterium lamps, readily revealing any stray energy in both the visible and UV regions.
Wavelength Accuracy
The Wavelength Accuracy Standard has a transmittance peak near 515 nm, which is certified as a Wavelength Accuracy Standard and is NIST traceable. The symmetry of this peak means that the tests of wavelength accuracy are independent of the spectral bandwidth (up to 20nm) of the instrument being tested. Also, the testing peak of 515 nm is located at that point where the tungsten lamp shows the flattest energy measurement response to wavelength change.
Spectrophotometric Performance
These 10%T and 50%T Neutral Density filters test spectrophotometric accuracy, precision and linearity. Since the transmittance of this glass is extremely constant with changes in wavelength near 590 nm, spectrophotometric errors can be distinguished from wavelength errors. No spectral bandwidth compensation is required. The Control Standard verifies that the holder itself does not affect the 100%T reading.
Optical alignment in the sample compartment can be evaluated by using the Control Standard and photosensitive paper. The paper records the position of the light beam in the cuvette holder.
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