Ge-CAL Spectral Responsivity Standard (800-1800nm)

  • Ge-CAL Spectral Responsivity reference Standard 800-1800nm

Calibrated in our dedicated laboratory, in short-circuit conditions, with respect to standards calibrated by the Physicalish Technische Bundesanstalt (PTB, Germany) a calibration range of 800-1800nm is on offer.

Housing a 5mm diameter active area germanium photodiode (800-1800nm), the Ge-CAL delivers enhanced linearity and exceptionally low noise. Operated in the photovoltaic mode, the photocurrent generated by this detector is best measured in using a trans-impedance amplifier such as that of the Bentham 487 or 477.

Core benefits


  • Spectral responsivity standard, 800-1800nm (A.W-1)
  • Germanium photodiode 
  • High sensitivity 5mm diameter active area
  • Calibration performed with respect to the Physicalish Technische Bundesanstalt (PTB, Germany)
  • Compatible with the entire range of Bentham monochromators and accessories
  • Recommended for use with the 400 Series of detection electronics


Material Germanium
Active area 5mm diameter
Spectral response range 800-1800nm
Operating mode Photovoltaic
Dark Current (typ.) <1pA
Shunt Resistance (typ.) 15kΩ
Peak Wavelength (typ.) 1500nm
Peak Responsivity (typ.) 0.90 A.W-1
NEP 1.5 x 10-12 W.H-1/2
Maximum Operating Temperature -20 to +60°C


Measurement Type Short-circuit spectral responsivity
Wavelength Range 800-1800nm
Wavelength Interval 5nm
Temperature at calibration 20°C
Traceability Physicalish Technische Bundesanstalt (PTB, Germany)
Calibration Frequency Three yearly recommended


Connector BNC
Compatibility 4 x M3 clearance holes in Bentham slit pattern
Dimensions 80L x 50W x 42H (mm)


CALIBRATION-DH-GE-5 Spectral responsivity calibration 800-1800nm

Ordering Information

DH_GE_5 Ge-CAL Spectral Responsivity Standard
CALIBRATION-DH-GE-5 Spectral responsivity calibration 800-1800nm

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