Photon counting head


The H11870 series is a wide sensitive area photon counting head device containing a 25 mm (1") diameter head-on photomultiplier tube, a high-voltage power supply circuit and a photon counting circuit. The high voltage supply for photomultiplier tube and the discrimination level are preset to optimum values, allowing photon counting measurement by just connecting a +5 V supply. The H11870 series has a function of over light detection output for indicating the excessive light operating condition.
A mount flange (E6264) is provided as an option for easy installation to measurement equipment.


Photocathode Area Shape Round
Photocathode Area Size Dia.22 mm
Wavelength (Short) 300 nm
Wavelength (Long) 850 nm
Wavelength (Peak) 420 nm
Dimension (W x H x D) DIa.34.0 mm x 114 mm
Input Voltage 5 V
Max. Input Voltage 6 V
Max. Input Current 100 mA
Count Senstitivity at 300 nm Typ. 2.1 x 105 s-1・pW-1
Count Senstitivity at 400 nm Typ. 2.5 x 105 s-1・pW-1
Count Senstitivity at 500 nm Typ. 2.0 x 105 s-1・pW-1
Count Senstitivity at 600 nm Typ. 1.3 x 105 s-1・pW-1
Count Senstitivity at 700 nm Typ. 7.8 x 104 s-1・pW-1
Count Linearity 6.0 x 106 s-1
Dark Count Typ. 5000 s-1
Dark Count Max. 15000 s-1
Pulse-pair Resolution 18 ns
Output Pulse Width 9 ns
Output Pulse Height Min. +2 V (Load resistance 50 Ω)
+4 V (Un-terminated)
Output Pulse Height Typ. +2.2 V (Load resistance 50 Ω)
+4.4 V (Un-terminated)
Recommended Load Resistance 50 Ω
Signal Output Logic Positive logic
Operating Ambient Temperature +5 ℃ to +40 ℃
Storage Temperature -20 ℃ to +50 ℃
Weight 140 g

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