12
Specifications
Performance Specifications
Performance Specifications
Performance specifications are measured after a minimum 1 hour from cold
start or from lamp turn-on, with no cell or filter unless specified, see Table 2.
Cold start in this context means that the spectrophotometer had been stored
for some hours at room temperature.
Table 2 Performance Specifications
Type Specification Comments
Wavelength range 190–1100 nm
Slit width 1 nm
Resolution > 1.6 Toluene in hexane, ratio of absorbances at 269 and 266 nm
Stray light < 1.0 % At 200 nm, solution of 1.2% KCl, blank scan on air, 5 s integration
time; (EP
*
method)
**
< 0.05 % At 220 nm, solution of 10 g/l NaI, blank scan on air, 5 s integration
time; (ASTM method)
< 0.03 % At 340 nm, solution of 50 g/l NaNO2, blank scan on air, 5 s integration
time; (ASTM method)
Wavelength accuracy < ± 0.5 nm NIST 2034 standard, using transmittance peak minima; wavelength in
NIST certificate are interpolated for 1.5 nm bandwidth from the
values given for 2 nm and 1 nm bandwidth; uncertainty of standard
from NIST certificate (typically ±0.1 nm) is added to the specification;
99-point spline function is used; 0.5 s integration time
Wavelength reproducibility < ± 0.02 nm Ten consecutive scans with NIST 2034 standard; 0.5 s integration
time
Photometric accuracy < ± 0.005 AU NIST 930e standard at 1 AU, at 440.0, 465.0, 546.1, 590.0, and 635.0
nm, the expanded uncertainty from NIST certificate is added to the
specification; 0.5 s integration time
Photometric accuracy < ± 0.01 AU Potassium dichromate in 0.01 N H
2SO4 at 235, 257, 313, 350 nm;
blank scan on 0.01 N H
2SO4; 0.5 s integration time (EP method)
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