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六、噪声问题的隔离 很多老一代的电缆测试仪是用模拟技术(频率扫描)来测试NEXT和衰减。这类仪器中都使用窄带滤波器以防止噪声干扰测试结果。
Isolation of Noise Problems Many older generations of cable testers tested NEXT and attenuation using analog techniques (frequency sweeps). Narrow-band filters are used in these instruments to prevent noise from interfering with the test results.