But it is a pity that owing to the inaccuracy of the traditional methods for measuring this spacing, the errors of frequency response of most current test tape all over the world will be at over 20% or 2dB.

• 遗憾的是,由于测量这种间隔的传统方法不准确,致使目前世界上流行的多数测试带,其频率响应误差在20%25或2dB以上。 本文提出一种用固定频率、变化波长的措施测量头、带接触面之间非磁性间隔的理论和方法。