GTAF米用中子飞行时间方法测量中子能量,飞行时间由BaF_2探测器信号被获取系统测量到的时间确定,因此对FlashADC数据获取系统的时间精度有严格要求。为真实反映40路信号通道间的时间同步性,设计了如下的测试方案:将幅度为-150 mV的门信号,经过有源扇出电路后,同时接入FlashADC的40路信号通道进行波形采集。通过使用数字化恒比定时方法(阈值为峰值的60%),可以得到门信号到达不同通道的时 The GTAF meter measures the neutron energy with the neutron time of flight method. The flight time is determined by the time taken by the BaF_2 detector signal acquisition system. Therefore, the time precision of the FlashADC data acquisition system is strictly required. In order to truly reflect the time synchronization between 40 signal channels, a test scheme is designed as follows: a gate signal of amplitude -150 mV is input into the 40 channels of the Flash ADC through the active fan-out circuit to acquire the waveform . By using the digital constant-ratio timing method (threshold value 60% of peak value), it can be obtained when the gate signal reaches different channels