cas 120

A Poweful Spectrometer Designed Specifically For Production and Labortory Used

Instrument Systems CCD Array Spectrometer CAS 120 deploy the proven metrology from Instrument Systems even in pricesensitive applications, such as LED production testing or quality assurance.  CAS 120 spectrometer presents an appealing solution for cost-sensitive applications like LED production and quality assurance. Although costs have been reduced, technical innovations deliver even higher levels of reliability and robustness. The CAS 120 complies with the high requirements for measuring accuracy and versatile application without any compromises.

Unique technical innovations integrated in the CAS 120 result in a higher level of dependability and speed. These benefits are achieved alongside reduced cost even under the demanding conditions experienced in 24/7 production environments. The spectrometer also complies with the exacting requirements of accuracy and versatility without compromise.

A back-illuminated CCD area sensor with 2048 x 14 pixels is used for all models. Vertical binning enhances the dynamic range. Cost-intensive cooling of the CCD detector has been deliberately omitted for the CAS 120. Instead, the temperature of the CCD sensor is recorded each time a spectrum is measured, and the signal is then corrected.


Industrial Quality Control  | Production Testing | Laboratory | VIS And UV VIS Range

CAS 120 CCD Array Spectrometer

  • Model versions UV/VIS and VIS
  • Precision spectrograph with integrated density filter wheel (OD 1 – 4)
  • Shutter for automatic dark current correction
  • 2048 x 14 pixels back-illuminated CCD detector, 16 bit ADC
  • Short integration times of 4 ms
  • USB interface
  • Hardware I/O trigger

CAS 120 CCD Array Spectrometer


ModelCAS120-152 (UV/VIS)CAS120 151 (VIS)
Spectral Range200 ~ 800 nm360 – 830 nm
DetectorBack-thinned CCDBack-thinned CCD
Number of pixels2048 x 142048 x 14
Spectral resolution¹⁾2.7 nm2.2 nm
Data Point Interval0.35 nm0.3 nm
Wavelength Accuracy²⁾± 0.3nm± 0.3nm
Integration time4 msec ~ 20 sec 4 msec ~ 20 sec 
Linearity± 0.6%± 0.6%
Broadband fo Illumination A radiation³⁾7 x 10̄ ⁴ 5 x 10̄  ̄⁴ 
for LED⁴⁾5 x 10̄  ̄⁴ 5 x 10̄  ̄⁴ 
with laser⁴⁾1 x 10̄  ̄⁴ 1 x 10̄  ̄⁴ 
LED measurement
Measuring range luminous intensity⁵⁾1 mcd ~ 5 kcd2 mcd ~ 5 kcd
Measuring range luminous flux⁶⁾1 mlm ~ 3.3 klm2 mlm ~ 3.3 klm
Measuring uncertainty luminous intensity⁷⁾±4%±4%
Measuring uncertainty luminous flux⁷⁾±4%±4%
Measuring uncertainty dominant wavelength⁷⁾±0.5nm±0.5nm
Measuring uncertainty color coordinated⁷⁾±0.002±0.002
Sensitivity range for iirradiance⁸⁾5 x 10̄  ̄⁸  – 5 x 10² W/m²nm3 x 10̄  ̄⁸  – 3 x 10² W/m²nm
Signal sensitivity at 1s integration time⁸⁾8 x 10̄  ̄⁷ W/m²nm5 x 10̄  ̄⁷ W/m²nm
Spectrradiometric accuracy⁷⁾±4%±4%
Measurement accuracy for color coordinates at illuminant A⁷⁾±0.002±0.002
Reproducibility of color coordinate measurement at illuminant A⁷⁾±0.0002±0.0002
Baseline noise⁹⁾±400 counts or  ±2.5%
Photometric transmission measurement accuracy±1% T
Baseline drift¹⁰⁾0.3%/h
Focal length, f number, gratingapprox 120mm, f/3.5, plane refrection grating
SlitModels UV/VIS and VIS : standard: 100 μm; optional: 50 μm
Filter wheel / ShutterStandard for all models; density flter OD 1 – 4; model UV/VIS with UV density flters;
position monitoring with encoder
Electrical Data
AD converter16 bit resolution
PC interfaceUSB 2.0
TriggeringInput: TLL ascending slope; output: 2 TTL outputs (software controlled), one TTL fash pulse
Dimension (H x W x D mm)147 x 343 x 317 mm
Power supplyWide-range input 100 VAC to 240 VAC 50/60 Hz
Power consumptionmax. 35 VA
Ambient temperature15 – 35 °C; relative humidity 70 % max., non-condensing
Weightapprox. 7 kg
Standards complainceIn conformity with EN 61010-1:2002-08 (safety requirements governing electrical equipment
for measurement, control and laboratory use)

1) Approximate values for 100 μm standard slit. Other values for optional 50 μm slit.
2) Applies to Penray lamp or laser.
3) Measured at 400 nm in combination with a GG455 long-pass filter relative to peak intensity of unweighted spectral data.
4) Measured at 150 nm gap left of the peak wavelength, relative to peak intensity of unweighted spectral data.
5) Applies for a signal/noise ratio of 10:1, for yellow LED with 585 nm and with LED-436 Adapter. The values are a factor of 20 to 100 higher for white LEDs.
6) Applies for a signal/noise ratio of 10:1, for yellow LED with 585 nm and with ISP250 Integrating Sphere. The values are a factor of 20 to 100 higher for white LEDs.
7) Immediately after calibration relative to the calibration standard and without density filter. Indicated errors refer to the twofold standard deviation.
8) Measured with EOP-120 External Optical Probe and OFG-414 Fiber Bundle, at 600 nm wavelength and signal/noise ratio of 10:1, including the density filters and without averaging.
9) Signal level for shortest integration time and at 30,000 counts.
10) Applies for 30 minutes with LS100-130 after 1 hour warm-up time.