Máy quang phổ Dynamica Halo DB-20, Halo DB-20S
The Halo DB-20 is a high performance double beam spectrophotometer suitable for many analytical applications where a higher level of accuracy is required.
Spectral Features
Coma aberration elimination from the concave diffraction grating achieves a high resolution 1.5nm (DB-20S : 1nm) spectral bandpass and certifies compliance of the Halo DB-20 to the stringent European Pharmacopoeia standards. Other specifications include an impressive wavelength accuracy of 
0.3nm, noise level 0.0003Abs (500nm) and stray light 
0.05% (220nm NaI, 340nm NaNO2).
Built-in and Diverse Range of Measurement Modes
Photometry Mode: Perform quantitative analyses in either absorbance or transmittance modes. Select from single wavelength, up to 6 different individual wavelengths, nucleic acid/protein A260/A280 ratios and set up calibration curves with up to 20 standards for concentration measurements.
Time Scan: Perform kinetic measurements for time periods ranging from 1 minute to >27 hours. Measurement intervals are factory preset and automatically selected when the scan time is set.
Wavelength scan: Perform a full spectral scan from 190 to 1,100nm at any of 8 incremental and preset selectable scan speeds starting from a high resolution 10nm/minute up to a swift 3,600nm/minute. Data is displayed as either numerical values or a graphical spectrum. Furthermore perform downstream processing of data, such as peak/valley search or smoothing, directly on board or with the optional Halo UV Detective software.