提出以电调谐的声光滤光器作为色散元件，研究光电倍增管光谱特性新的测试方法．采用时间相移技术，对系统定标，使监控光束直接截取自测量光束 A new method for testing the spectral characteristics of photomultiplier tubes is proposed based on the electrically tunable acousto-optic filter as dispersive element. Time-phase shift technique is used to calibrate the system so that the monitoring beam directly intercepts the self-measuring beam