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长度测量
利用仪表的时域反射 (TDR)功能,可测量线缆长度,无论被测线缆是否存在开路、短路故障,或是否接有远端模块或
识别器。任何 TDR 只能被用于测量电缆具有均匀的特性阻抗的长度。该 TDR 可能无法在使用鳄鱼夹连接到电缆未
确捻金线得到可靠的结果。
长度可以显示为米或英尺。
要设置长度测量单位:
反复按下“工具”按钮,直到米或英尺符号闪烁。
按下
o 长度单位在米与英尺之间变换。
反复按下“工具”按钮,直到“设置”指示符消失。
精准的长度测量取决于待测线缆是否正确设置了额定传输速率 (NVP) 确定此设置,可查阅线缆制造商的数据,
或检测一段已知长度的与待测线缆类型相同的线缆。
要设置 NVP:
将一段已知长度 (>15m/50ft) 的线缆连接到测试
仪(如果适用)
反复按下“工具”按钮,直到 NVP 设置闪烁
按下,直到显示所需的 NVP 或正确显
了已知线缆长度
反复按下“工具”按钮,直到“设置”指示符消失。
NVP 设置
要测量线缆长度:
将线缆连接到测试仪。
o 显示屏上显示线缆长度。
按下目前所选端口的端口选择按钮。
o 显示屏上转而显示总体线缆长度或线缆内
某条独立线对的长度。
反复按下按钮可轮流显示每条线对的长度或总
体长度。
o 通过检查独立线对的长度,可发现线缆故
障和故障点距离
o 独立线对的长度通常不同,且由于其内部
互绞构造,其长度可能会长于总体线缆。
线缆长度
长度单位
总体线缆长度
线对 1-2
长度
线对 3-6
长度
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