Calibration Standard, Holmium Oxide Glass
• For checking wavelength calibration of spectrophotometers
• As suggested by Dr. J.M. Vandenbelt of Parke-Davis Laboratories in article “Holmium Filter for Checking the Wavelength Scale of Recording Spectrophotometers”, Vol. 51, p. 802 (1961)
• Use of glass filters for spectrophotometer wavelength calibration should be considered auxiliary to, rather than a substitute for, the emission spectra of the mercury vapor lamp
• 8470F10 consists of 8470F18 Filter and a Holder
• Fits spectrophotometers that are equipped to take standard 10 mm cuvettes
• 8470F18 Filter is Corning No. 3130 glass, cut to 10 x 24.5 mm; is UV-transmitting and has several sharp absorption bands near 241, 280, 288 and 360 nm
• 8470F10 furnished with representative spectral transmittance curve for holmium oxide filter
Hinged back is spring-loaded to hold filter in place. Filters of other types, 10 x 24.5 mm and up to 4.5 mm thick, can be substituted in the holder. Filters easily removable for cleaning.
Calibration Filter, Didymium Glass
• For use in a Filter Holder
• Size 10 x 24.5 mm
• Of Corning 5120 Glass
Has many sharp peaks for checking wavelength in visible range. Representative spectral curve furnished with filter.
Calibration Filter, Didymium Glass, Round
• Usable with Spectronic 20, Spectronic 20D or Sequoia-Turner Models 330, 340, 350 and 380 Spectrophotometers
• For checking calibration in visible range and meter performance
• See R.N. Rand, “Practical Spectrophotometric Standards,” Optical Chemistry, 15, 839-863 (1969)
Consisting of a Corning No. 1-60 didymium glass filter mounted in end of phenolic plastic holder, approximately 13 mm diameter x 100 mm long. Window in opposite end of holder provides unobstructed air path for light beam when holder is inverted for setting meter reading at 100% transmittance. Complete with directions for use, including spectral transmission curve for filter. Temperature change can cause slight shift in transmission curve. Fits holders 8420Q18 and 8425D50.
