Lambda Advanced Technology
Products  UV-VIS  U3900
Ratio Beam Spectrophotometer


Research grade UV Vis spectrophotometers featuring traditional double beam technology, PMT detector and variable band pass down to 0.1nm. The U3900 / 3900H offer a wide linear dynamic range and features a double monochromator for exceptional stray light rejection

Possible to perform measurements in a wide absorbance range with low stray light and low noise

The larger the amount of transmitted light, the lower the noise of the obtained absorption spectrum so that a wider absorbance range can be measured. Measurements of high concentration samples can be performed over a wider concentration range.

Stable spectrometer with double beam optical system

The light source uses a WI lamp (visible range) and a D2 lamp (ultraviolet range) that switches wavelength depending on the measurement. The double beam system divides the monochromatic light so that the diffraction grates into the control and the sample with a rotational mirror, guiding the light to the sample chamber.

UV Solutions for U-3900 (PC connected) allows for easy device control and supports various quantitative-analysis functions

Special operation software that offers substantial functions such as measurement data comparison and a preview function that allows for a more powerful analysis.

Substantial accessories for both liquid and solid measurements

There is an abundant lineup of accessories to accommodate multiple sample and micro sample applications, etc.

Loaded with aberration-corrected concave grating

The U-3900/3900H provides aberration-corrected concave gratings with a Seya-Namioka Mount for the spectrometer. Both condensing and dispersing functions allow for a bright optical system, but with fewer mirrors so that light loss and aberrations are reduced.

Two types of optical systems: Single Monochrome (U-3900) and Double Monochrome (U-3900H)

A lineup of two models with different spectrum systems: Single Monochrome (U-3900) and Double Monochrome (U-3900H).
The Single Monochrome is suitable for a low-concentration sample since sample light energy is stronger compared tothe Double Monochrome. The Double Monochrome is suitable for a high-concentration sample since it can measure high absorbance with little stray light.


ITEM U-3900 U-3900H
Monochromator Diffraction grating
Single Monochromator Seya-Namioka mount
Diffraction grating-diffraction
grating Double monochromator
Seya-Namioka mount
Wavelength range 190 to 900 nm
Spectral bandpass 0.1, 0.5, 1, 2, 4, 5 nm (6 steps)
Wavelength accuracy ?? 0.1 nm (at 656.1 nm after wavelength calibration)