请问8753A至S参数测试装置的电缆是否需要相位匹配？

最初这些电缆被指定为相位匹配，因为具有87046A测试装置的原始8753A具有指定的未校正性能，而不是相位线性度和损耗。
这些规格旨在匹配8754的性能，后者是一个完全模拟的VNA。
在首次发货之前，由于频率范围的增加，无法保持相同的规格，因此添加了内部因子偏移值（称为采样器校正）以对数值进行数值调整。
与8510（这是第一个真正的数字控制VNA）不同，只有用户级别的校正，8753具有采样器校正，这改善了采样器的原始响应。
尽管如此，惠普仍然很慢，所以仍然存在未经修正的响应的规范，并且电缆需要在相线性方面进行匹配以实现这一点。
在实践中，它没有任何区别。
并且有纠错的用户，实际上没有任何好处。
因此，请使用任何稳定的电缆并通过所需的频率。
（人们可以争辩说，即使是8510也没有完全数字化，因为它有一个模拟实/虚检测器，然后将代表实数和虚数值的直流电压数字化;因此8753是第一个具有数字信号的全数字IF的VNA
IF（第3次IF）和数字检测。）



     以下为原文

  Originally these cables were specified to be phase matched, as the orginal 8753A with the 87046A test set had specified uncorrected performance than included phase linearity as well as loss.  The specs were intended to match the performance of the 8754 which was a fully analog VNA.  Before the first shipments, due to increasing the frequency range, it wasn't possible to maintain the same specs so an internal factor offset value (called sampler correction) was added to numerically adjust the results.  Unlike the 8510 (which was the first true digitally controlled VNA), where the only correction was at the user level, the 8753 had sampler correction which improved the raw response of the samplers.  Still, HP was very slow to chagne so a specfication for uncorrected response remained and the cables needed to be matched in phase linearity to acheive that.  In practice, it makes no difference.  And with the user of error correction, there is really no benefit at all.  So use any cables which are stable and pass the frequencies needed. 

(one can argue even the 8510 was not fully digitial as it had an analog real/imaginary detector, and then digitized the DC voltage representing the real and imaginary values; thus the 8753 was the first VNA that had a fully digintal IF with a digitl IF (3rd IF) and digital detection.)