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industrial spectroradiometer iSR900

The industrial spectroradiometer iSR900 is an autonomous and high-resolution measuring system for fast and precise measurements in the UV, visible spectral range and IR.

The spectroradiometer consists of an array spectrometer without moving parts and a silicon detector with 2048 pixels. The spectral resolution is 0.44 nm.

The iSR900 is combined with an SMA-905 quartz light guide and our radiometric measuring heads for irradiance and illuminance measurement.
The iSR900 is factory calibrated to PTB. A DAkkS test in our accredited laboratory is optionally available. The iSR900 thus allows accurate spectroradiometric measurements for the evaluation of irradiance and illuminance. The low-scatter design achieves high sensitivity in the UV range.  Control and data evaluation take place in the iSR900 so that only a USB or RS485 / RS232 interface is required for the evaluation.

With trigger input and output the iSR900 is ideal for automated measurements.



  • Spectral range 200-1100 nm
  • Nearly scatter-free grid with 300 lines/mm
  • Spectral resolution 0.4 nm and 2,3 nm bandwidth
  • Order filtering
  • Radiometric and effect-related measurements
  • USB, RS485 or RS232


  • Spectroradiometry
  • Online process control, quality control
  • Testing of light sources (lamps, LEDs)
  • Inspection of optical materials and components, e.g. light conductors
  • Qualitative and quantitative analyses in chemistry, pharmacy and biology

iSR900 Sample commands

iSRSerialNr? Serial number query
iSRFirmware? Queryfirmware version
iSRReset! Reset command
iSRIntTime: 400! Setting the integration time
iSRMeasAVG?! Request/Command Averages
iSRCalibDate?: Calibration date request
iSRStartDark! Start dark measurement
iSRStartMeas! Start measurement command
iSRMeasResult? Inquiry of measurement result


Spectral range 200 - 1100 nm
Spectral resolution 0,44 nm (pixel pitch)
Spectral bandwidth 2,3 nm (FWHM)
Grating 300 l/mm, holografic
Focal length 75 mm
Blaze wavelength 250 nm
Detector SI
Pixel size 14 x 200 µm
Number of pixel 2048
Resolution 16 bit
Integrations time 0,1 ms to 60 s
measurement duration, typ. 300 ms
Interface USB, RS232 or RS485
Trigger I/ O, rear connection
Dimensions 250 x 320 x 100 mm
Gewicht 3,5 kg
Supply voltage 230 V, 50 Hz
Power < 25 W
Operating temperature 5 to 40 °C
Storage temperature -10 to 60 °C
Humidity <80%, non-condensating
Communication ASCII with CRC-16