Photon counting head


The H12775 is a photon counting head device containing of a 10-mm (1/2") diameter head-on photomultiplier tube, along with a high-speed photon counting circuit and a high-voltage power supply 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 H12775 has a function of over light detection output for indicating the excessive light operating condition.


Photocathode Area Shape Round
Photocathode Area Size Dia.10 mm
Wavelength (Short) 300 nm
Wavelength (Long) 650 nm
Wavelength (Peak) 420 nm
Dimension (W x H x D) 25.0 x 40.0 x 68.0 mm
Input Voltage +4.75 to +5.25 V
Max. Input Voltage 6 V
Max. Input Current 40 mA
Count Senstitivity at 300 nm Typ. 2.5 x 105 s-1・pW-1
Count Senstitivity at 400 nm Typ. 4.4 x 105 s-1・pW-1
Count Senstitivity at 500 nm Typ. 3.6 x 105 s-1・pW-1
Count Senstitivity at 600 nm Typ. 1.2 x 105 s-1・pW-1
Count Linearity 5.0 x 106 s-1
Dark Count Typ. 30 s-1
Dark Count Max. 100 s-1
Pulse-pair Resolution 20 ns
Output Pulse Width 10 ns
Output Pulse Height Min. +2.0 (Load resistance 50Ω)
+4.0 (Un-terminated) V
Output Pulse Height Typ. +2.2 (Load resistance 50Ω)
+4.4 (Un-terminated) V
Recommended Load Resistance 50 Ω
Signal Output Logic Positive logic
Operating Ambient Temperature +5 to +40 ℃
Storage Temperature -20 to +50 ℃
Weight 79 g

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