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Photon counting unit

C9744

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Photon counting unit is designed to convert single photoelectron pulses from a photomultiplier tube into 5 V digital signals by use of the built-in amplifier and discriminator circuits. Photon counting with a high S/N ratio can be performed by simply connecting a counter to the output of the photon counting unit. The C9744 uses a high-speed electronic circuit that allows measurement with an excellent output linearity up to 107 s-1. The C9744 also has a prescaler (division by 10) eliminating the need for a high-speed counter.

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Specifications

Parameter Description/Value Unit
Input impedance 50 Ω
Discrimination level (input conversion) -0.4 to -16 mV
Required PMT gain Approx. 3 × 106 -
Prescaler ÷1 / ÷10 -
Count linearity ÷1 4 × 106 s-1
÷10 1 × 107
Pulse-pair resolution ÷1 25 ns
÷10 10
Output pulse CMOS 5 V, POSITIVE LOGIC -
Output pulse width ÷1 10 ns
÷10 Depends on count rate -
Supply voltage +5.0 V ± 0.2 V, 130 mA / -5.0 V ± 0.2 V, 50 mA -
Connector Input BNC-R -
Output BNC-R -
Power DIN (6-pin) *1 -
Dimensions (W × H × D) 90 × 32 × 140 (excluding rubber feet and projecting parts) mm
Operating ambient temperature 0 to +50
Operating ambient humidity *2 Below 80 %
Storage temperature -15 to +60
Storage humidity *2 Below 85 %
Weight Approx. 250 g

*1 Supplied with a cable (1.5 m) attached to the mating plug.
*2 No condensation

Block diagram

Dimensional outline (Unit mm)

Connection example

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