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This Reference Material can be used to qualify the wavelength calibration, in the ultraviolet and visible regions of the spectrum (240 nm - 795 nm) of spectrophotometers with spectral bandwidths of 5 nm or less.

Holmium and didymium (neodymium & praseodymium) oxides in perchloric acid have been separately used for the validation of the wavelength scale of UV and visible spectrophotometers for many years. Now, these materials are available from Starna as a combined reference, providing useful peaks that are interference-free over its whole wavelength range from 240 to 795 nm. 

 

holmium and didymium

14 peaks are certified, with nominal values: 241, 287, 361, 416, 444, 482, 485, 522, 537, 575, 641, 732, 740 and 794 nm.

Holmium-and-Didymium

 

A Certificate of Calibration and Traceability and full instructions for use are provided with each Reference Material. Starna Scientific is accredited to both ISO 17034 (4001) as a Reference Material producer, and ISO/IEC 17025 (0659) as a Calibration Laboratory for optical reference measurements. Starna offers a Lifetime Guarantee on all its Reference Materials.

 
 
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PRODUCT ENQUIRY 
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FURTHER PRODUCT INFORMATION 
& HOW TO ORDER

 

These references can be used to qualify the absorbance accuracy and linearity of visible spectrophotometers with a spectral bandwidth of 6.5 nm or less, over the wavelength range 440 -635 nm.
Measurements made with these references will be accepted as evidence of instrument qualification by:

  • United States Pharmacopoeia
  • American Society for Testing and Materials
  • Therapeutic Goods Administration (Australia)
  • British Pharmacopoeia

Schott NG-type glasses have been used for over thirty years for the validation of the absorbance scale and linearity of spectrophotometers in the visible region. Filters with a wide range of transmission and absorbance values can be produced.

 

RM-1N2N3N

The spectrum of these filters is essentially flat over the range of calibration.

Neutral-Density-Filters-

A range of 18 filters is available from Starna, covering absorbance values from approximately 0.04 A to 3.5 A, calibrated at 440 nm,  465 nm 546.1 nm 590 nm and 635 nm.

 

A Certificate of Calibration and Traceability and full instructions for use are provided with each Reference Material. Starna Scientific is accredited to both ISO 17034 (4001) as a Reference Material producer, and ISO/IEC 17025 (0659) as a Calibration Laboratory for optical reference measurements. Starna offers a Lifetime Guarantee on all its Reference Materials.

 

 

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