然而，脉冲计数的准确性受到很多因素的影响，分析认为主要是由外界电磁干扰和多斑点的产生引起计数的不准确。
But, the accuracy of the count is affected by many factors, mainly by the interference of the external electromagnetic waves and the generation of the multi cathode spots.
针对怎样抑制周期性干扰，文献中报道较多的是LMS自适应滤波方法，但该方法需调整参数多，对脉冲型干扰表现出不稳定性。
Aiming at how to prevent periodic interference, more papers have covered LMS adaptive filter, which needs to adjust many parameters and shows instability in pulse type interference.
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。
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.
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