自光电倍增管而下测量系统由脉冲放大、整流、积分和计数器等组成。
The measuring system consists of a pulse amplifier, a rectifier, an integrator, and a pulse counter.
实验结果表明，由于光子计数器的核心器件光电倍增管及其高压电源不很稳定，光子计数器需要经常校验和标定。
Experimental results shows that the core device of the photon counter-PMT and it's high voltage power supply is not stable, the photon counter can be test and calibrated frequently.
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