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The
Model 5000-16C 1000-watt FEL Lamp Standard provides absolute calibration
of spectral irradiance from 250 nm to 2.5 microns. This tungsten-halogen
lamp standard bears the ANSI designation of FEL. It has been selected by
the National Institute of Standards and Technology to replace the 1000-watt,
DXW standard. It is calibrated to the 1973 NIST spectral irradiance scale,
while the DXW standard is calibrated to the 1965 NIST Scale.
Lamp calibration is directly traceable to the National Institute of Standards
and Technology by incorporating two NIST spectral irradiance scales. This
results in estimated accuracies of 2.4% at 250 nm, 1.8% at 450 nm and
1.5% over the
range from 555 to 1600 nm. The 1965 NIST Scale of spectral irradiance is
used over the spectral range from 1700- to 2500-nm. NIST uncertainty
over this wavelength
region is approximately 3%. There is no appreciable degradation of accuracy
in the Gamma Scientific transfer calibration process.
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