摘要：由于线缆工业趋向千兆以太网的网络应用，专业测试仪就需要支持高带宽并符合ISO F 600MHz或Cat．6a-625MHz测试标准。在这种频率更高的状态下，测试信号更接近于线缆标准的极限值。因此，测试仪本身产生的噪声必须严格控制。
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