When we use computer to count the number of external pulse,because of disturbing pulses the number of pulses that computer receives is bigger than its actual number.

• 在使用计算机对外部脉冲进行计数的过程中 ；由于干扰脉冲的存在 ；计算机得到的脉冲数往往比实际的脉冲数要多 .