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SJS－1型计时仅采用光电输入，自动计时，并有记忆功能．分期显示先后两次时间，通过用单稳态触发器替代双稳态触发器以实现任意时间显示，加自锁电路以避免无效触发引起计时错误。
SJS-1-type timing using only optical input, automatic timing, and memory function. Stages show two times in a row, by using monostable flip-flop instead of flip-flop to achieve any time display, plus self-locking circuit to avoid invalid trigger timing error.