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四、测试速度的考虑 在过去,绝大多数电缆测试仪使用的是模拟频率扫描技术来测量NEXT。其方法是沿某对双绞线发送某一特定频率的正弦波,测试相邻几对线的NEXT。然后改变频率重复上述过程。下表列出了TSB-67所规定的频率步长:
Fourth, the test speed considerations In the past, the vast majority of cable tester using analog frequency scanning technology to measure NEXT. The method is to send a sine wave of a particular frequency along a twisted pair and test the NEXT of several adjacent pairs. Then change the frequency to repeat the above process. The following table lists the frequency steps specified by TSB-67: