Photon counting head


The H11890 series is a compact photon counting head consisting of a metal package photomultiplier tube along with a high speed photon counting circuit and a high-voltage power supply unit. The high voltage supply for the photomultiplier tube and the discriminator level are preset to optimum values, allowing photon counting measurement by just connecting to a PC. Photon counting measurement data transfer, counter gate time and other necessary adjustments are controlled by commands from the PC through the USB interface.


Photocathode Area Shape Round
Photocathode Area Size Dia.8 mm
Wavelength (Short) 230 nm
Wavelength (Long) 870 nm
Wavelength (Peak) 400 nm
Dimension (W x H x D) 22.0 mm x 40.0 mm x 48.0 mm
Input Voltage USB Bus Power
Max. Input Voltage 6 V
Max. Input Current 50 mA
Count Senstitivity at 300 nm Typ. 2.7 x 105 s-1・pW-1
Count Senstitivity at 400 nm Typ. 3.6 x 105 s-1・pW-1
Count Senstitivity at 500 nm Typ. 2.8 x 105 s-1・pW-1
Count Senstitivity at 600 nm Typ. 2.0 x 105 s-1・pW-1
Count Senstitivity at 700 nm Typ. 1.2 x 105 s-1・pW-1
Count Senstitivity at 800 nm Typ. 3.0 x 104 s-1・pW-1
Count Linearity 5.0 x 106 s-1
Dark Count Typ. 600 s-1
Dark Count Max. 1000 s-1
Pulse-pair Resolution 20 ns
Operating Ambient Temperature +5 ℃ to +40 ℃
Storage Temperature -20 ℃ to +50 ℃
Weight 54 g

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