Description
| Description & NIST Traceability | Metal on Quartz Visible filter for absorbance and linearity in the UV and Visible area of the spectrum. NIST Traceable complete with UKAS ISO/IEC 17025 accredited certificate of calibration |
| Certified Wavelengths | 250, 280, 340, 360, 400, 465, 500, 546.1, 590 and 635 nm at spectral bandwidth of 5 nm or less. |
| Physical Configuration | Metal coated quartz filter with coated side protected by an optically contacted quartz window. The filters are mounted in protective aluminum holders that will fit a standard instrument cell holder. |
Product Description:
The Starna RM-1Q3Q9Q is a direct equivalent to the NIST SRM 2031, with a standard range of Metal on Quartz absorbance standards for the UV/Visible area of the spectrum. Please contact us if other reference combination sets are needed — by combining part numbers any confirguration of sets can be achieved.
All Starna Metal on Quartz filters have an optically contacted quartz cover plate to protect the metalized surface and facilitate easy cleaning. This was also a feature of the original NIST SRM 2031.
The filters allow absorbance and linearity at the ten wavelengths across the range and the relative values are shown on the table below. They can be certified at wavelengths other than those shown above, on request. The filters are manufactured in our ISO 9001 accredited production facility, under ISO Guide 34 as a reference material producer and calibration is carried out in our ISO/IEC 17025 accredited calibration laboratory.
| Metal on Quartz Filters |
| Part No. | %T Transmittance | Absorbance |
| RM-Q1 | 1% | 2.00 A |
| RM-Q3 | 3% | 1.52 A |
| RM-1Q | 10% | 1.00 A |
| RM-3Q | 30% | 0.52 A |
| RM-5Q | 50% | 0.30 A |
| RM-9Q | 90% | 0.06 A |
Suggestions for Use:
The UV/Visible Metal on Quartz filters have a relatively flat profile across all UV/Visible wavelengths. Normally three representative absorption filters would be chosen for any given application but the filters may be bought individually, in sets as shown below or any combination from the standard range.
Compare the spectrophotometer absorbance values to the certified absorbance values. Taking the expanded uncertainty budget† of the certified references into consideration, if the absorbance values fall within the expected parameters† of your instrument then your instrument is working correctly.
It is important to confirm that Metal on Quartz filters are suitable for use with your instrument as they have a highly reflective surface and some instruments are sensitive to back reflection within the sample compartment.
† Expected Parameters and Expanded Uncertainty Budget
The expanded uncertainty budget (k=2) is the tolerance that we could expect to measure in the assigned value on any one of our reference spectrophotometers during the 2 year period of certification.
When used to verify the performance of any given spectrophotometer this certificate tolerance must be added in a simple linear manner to the stated appropriate specification accuracy of the instrument on the test, see following example:
| Wavelength | Absorbance | |
| Certificate | ±0.10 nm | ±0.0049 A |
| Instrument | ±0.30 nm | ±0.0050 A |
| Total | ±0.40 nm | ±0.0099 A |
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