CAS 140D - The new reference for spectral measurement

The CAS 140D represents the fourth generation of the worldwide extremely successful series of high-end array spectrometers from Instrument Systems. It combines all advantages of the CAS 140CT in terms of measurement accuracy and reliability with sustainable technical optimization for increased repeatability and stability in every environment.

CAS 140D

As a result, it offers even more versatile applications – from the reference instrument in national calibration laboratories to continuous production. A wide range of accessories complement the spectrometer to create a complete system for a wide range of spectroradiometric and photometric measurement tasks.

Thanks to the modern housing and improved optical and mechanical design, the instrument is even more functional, but smaller and simpler to integrate into existing measurement environments.

The optics and mechanics used in the spectrograph block are optimized with regard to disturbing stray light. Additionally, a unique stray light correction matrix is integrated in the calibration procedure. Both innovations combined ensure an up to now unachieved precision in the determination of the blue light hazard with an array spectrometer.


  • High-end CCD detector, cooled and back-illuminated
  • Down to 4 ms integration time
  • Spectrograph with minimum stray light and enhanced throughput
  • Integrated density filter wheel
  • USB, PCIe or Ethernet interface
  • "Plug & play" accessory identification

Accredited Color Quality

  • Instrument Systems test laboratories accredited to ISO 11664 for colorimetric quantities.
  • Highly accurate measurement of correlated color temperature (CCT) and color rendering index (CRI).
  • Traceable measurement uncertainties of chromaticity coordinates only ±0.0015

    More information

Stray light correction

The application of a stray light correction matrix for the CAS 140D suppresses the stray light by an order of magnitude down to 10-5. In particular in the UV range the calibration is more precise. 3-4% higher radiometric precision is obtained in UV sources and up to 0.0005 more accurate determination of colour coordinates in visible LEDs.