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三、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。 每一对相邻的线对之间就要独立地测量484次。由
Third, 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. Each pair of adjacent pairs has to be measured 484 times independently. by