Technical data of the spectrometers
16 Edition 03/2013 SPECORD PLUS
SPECORD 250 PLUS
Optical principle Double-beam spectrophotometer with two tempered
photo diodes (CDD; Cooled Double Detection)
Optics Upstream monochromator and monochromator with
holographic concave grid
Division into two beam paths through fixed 50/50
beam divider
Wavelength range 190 - 1100nm
Photometric display range -8 – 8 A
Photometric measuring range -4 – 4 A
Wavelength accuracy of deuteri-
um line at 656.1 nm
≤ ±0.1 nm
Wavelength reproducibility
(with holmium oxide filter)*
≤ ±0.02 nm
Photometric accuracy VIS
at 546nm with neutral glass filter
Hellma F4*
≤ ±0.003 A
Photometric accuracy UV
with potassium chromate accord-
ing to Ph.Eur.
≤ ±0.01 A
Photometric reproducibility
≤0.0005 A
Stray light 200nm
( KCl Merck 1.08164.0001 )
≤ 0.03 %T
Stray light 220nm (NaI)
≤ 0.005 %T
Stray light 240nm (NaI)
≤ 0.005 %T
Stray light 340nm (NaNO2)
≤ 0.005 %T
Base line noise at 500nm
≤ 0.0001 (RMS)
Long-term stability at 500nm
≤ ±0.0005 A/h
Registration speed up to 12000 nm/min
Spectral bandwidth 0.2, 0.5, 1, 2, 4 nm
Spectral resolution capability
Toluol/Hexane at 20 – 25 °C
2.3 – 2.5 (for 0.5 nm)
* taking into account the tolerances of the standards applied
Overview 3 Physical/optical data of the SPECORD 250 PLUS
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