VT-VRPA1-50-11全新质保说明

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 然后是计算到线上的走线电感，如图2的计算公式。
       如果是低频或直流信号，则用走线电阻这个指标。走线电阻的ZUI简方法是用毫欧表测量，直接测两条线的阻值△R=R2-R1。
       下面以走线电感计算来说明，电阻的计算同理且较简单，留下列位回去自己分析练习了。在线缆不等长的时候，△U的误差则由L2-L1的长度差导致的电感差异引起信号衰减程度不同，△U=U1-U2+wL*i（i为电流，取ZUI大值的时候）。放大器的输出误差△=wL*i，输出误差△V=k*△=KwLi。
       系统误差要求△V/V≤误差百分比（如5%），V是满量程值，△V是ZUI大误差值，f是信号ZUI高频率（w=2πf），则不等式就转化成了图2公式中l和d与误差5%之间的关系。剩下的就是数学计算了。计算器可以作为很好的助手，反正又不是大学的考试现场，没人抓的。
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