Photon counting head


The H7828 series is a photon counting head device containing a 19 mm (3/4") diameter head-on photomultiplier tube, 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. Despite its compact size, the effective photosensitive area is as large as 15 mm in diameter, so the incident light can be collected very efficiently. Compared to other PMT modules, the H7828 series has higher resistance to vibration and shock, making them suitable for portable or mobile measurement equipment.


Photocathode Area Shape Round
Photocathode Area Size Dia.15 mm
Wavelength (Short) 300 nm
Wavelength (Long) 650 nm
Wavelength (Peak) 420 nm
Dimension (W x H x D) 26.0 mm x 50.0 mm x 56.0 mm
Input Voltage +4.5 V to +5.5 V
Max. Input Voltage 6 V
Max. Input Current 60 mA
Count Senstitivity at 300 nm Typ. 2.1 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. 5.0 x 104 s-1・pW-1
Count Linearity 1.5 x 106 s-1
Dark Count Typ. 200 s-1
Dark Count Max. 500 s-1
Pulse-pair Resolution 70 ns
Output Pulse Width 30 ns
Output Pulse Height Min. 3 V
Output Pulse Height Typ. 3.5 V
Recommended Load Resistance 50 Ω
Signal Output Logic Positive logic
Operating Ambient Temperature +5 ℃ to +40 ℃
Storage Temperature -20 ℃ to +50 ℃
Weight 70 g

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