公开(公告)号：US06707305B2

公开(公告)日：2004-03-16

申请号：US09978910

申请日：2001-10-16

申请人： Darrell J. Johnson ,  John C. McCosh

发明人： Darrell J. Johnson ,  John C. McCosh

IPC分类号： H04B346

CPC分类号： H04B3/46 ,  H04M3/22

摘要： The tone generator uses a highly accurate frequency signal to generate an accurate and stable tone signal. A cadence pattern may be used to output the tone signal onto a test cable in an easily distinguishable pattern. The tone signal may be selectively output at an in-band band frequency or an out-band frequency. A corresponding tone probe may be used to detect the tone signal. The tone probe uses a high-Q bandpass filter to reject all but the expected frequency of the tone signal. The signal passing the bandpass filter is proportional to the detected tone signal. The tone probe generates an audio signal unrelated to the frequency of the tone signal. The audio signal is modulated by the signal from the bandpass filter, and then broadcast through a speaker. Accordingly, the tone probe provides an audible sound proportional to the strength of the tone signal, but is unrelated in frequency.

摘要翻译： 音调发生器使用高精度的频率信号来产生准确稳定的音调信号。 可以使用节奏模式以将音调信号以容易区分的模式输出到测试电缆上。 音频信号可以选择性地以带内频带或带外频率输出。 可以使用相应的音调探测器来检测音调信号。 音调探头使用高Q带通滤波器来拒绝音调信号的预期频率。 通过带通滤波器的信号与检测到的音调信号成比例。 音调探头产生与音频信号的频率无关的音频信号。 音频信号由带通滤波器的信号调制，然后通过扬声器进行广播。 因此，音调探头提供与音调信号的强度成比例的可听见的声音，但在频率上是无关的。

公开(公告)号：US20170023632A1

公开(公告)日：2017-01-26

申请号：US15012237

申请日：2016-02-01

申请人： Darrell J. Johnson ,  John C. McCosh ,  Sara Johnson

发明人： Darrell J. Johnson ,  John C. McCosh ,  Sara Johnson

IPC分类号： G01R31/11 ,  G01R27/06 ,  H03L7/08 ,  G01R31/02

CPC分类号： G01R31/11 ,  G01R31/007 ,  G01R31/021 ,  H03L7/08

摘要： Briefly, a method and system is provided for testing a cable using a high performance Time Domain Reflectometry (TRD) system and method. The TDR has a timing generator that is constructed to generate a periodic launch pulse to excite a cable under test, and to generate sample signals that are time delayed from the launch pulse. The timing for the launch pulse and the sample signal may be defined by two correlated PLL circuits coupled to the same clock. In one implementation, the timing generator is constructed in a single FPGA. The invention also provides calibration circuitry to compensate for temperature, voltage, and manufacturing variations in the FPGA. In one example, a tester includes a switch system that enables one or more TDR engines to sequentially apply a TDR stimulus to substantially all the wire pairs in a cable harness, and to collect the resulting TDR waveforms. The waveforms are analyzed to determine if the cable harness meets quality standards.

摘要翻译： 简而言之，提供了一种使用高性能时域反射（TRD）系统和方法测试电缆的方法和系统。 TDR具有定时发生器，其被构造为产生周期性的发射脉冲以激发被测电缆，并产生从发射脉冲延时的采样信号。 发射脉冲和采样信号的定时可以由耦合到相同时钟的两个相关的PLL电路来定义。 在一个实现中，定时发生器被构造在单个FPGA中。 本发明还提供校准电路来补偿FPGA中的温度，电压和制造变化。 在一个示例中，测试器包括开关系统，其使得一个或多个TDR引擎能够将TDR激励顺序地应用于电缆线束中的基本上所有的线对，并且收集所得到的TDR波形。 分析波形以确定电缆线束是否满足质量标准。

公开(公告)号：US20130162262A1

公开(公告)日：2013-06-27

申请号：US13525333

申请日：2012-06-17

申请人： Darrell J. Johnson ,  John C. McCosh ,  Sara Marmolejo

发明人： Darrell J. Johnson ,  John C. McCosh ,  Sara Marmolejo

IPC分类号： G01R31/02

CPC分类号： G01R31/021 ,  G01R31/11

摘要： Briefly, a method and system for testing a cable harness is disclosed. Generally, a cable harness is used to route many electric wires for power, communication, and control. The tester includes a switch system that enables one or more TDR engines to sequentially apply a TDR stimulus to substantially all the wire pairs in the cable harness, and to collect the resulting TDR waveforms. The waveforms are analyzed to determine if the cable harness meets quality standards. In some cases the tester may also perform a continuity, resistance, capacitance, or inductance test on the cable harness. The tester may also measure and use temperature in analyzing the cable harness, or may apply temperature cycling, different or varying atmospheric pressures, vibration, shaking, or shock to the cable harness.

摘要翻译： 简而言之，公开了一种用于测试电缆线束的方法和系统。 通常，电缆线束用于路由许多电线用于电力，通信和控制。 该测试仪包括一个开关系统，使一个或多个TDR引擎能够对电缆线束中的所有导线对依次施加TDR激励，并收集所得到的TDR波形。 分析波形以确定电缆线束是否满足质量标准。 在某些情况下，测试仪还可以对电缆线束执行连续性，电阻，电容或电感测试。 测试仪还可以测量和使用温度来分析电缆线束，或者可以对电缆线束施加温度循环，不同或变化的大气压力，振动，振动或冲击。

公开(公告)号：US06434716B1

公开(公告)日：2002-08-13

申请号：US09240154

申请日：1999-01-29

申请人： Darrell J. Johnson ,  John C. McCosh

发明人： Darrell J. Johnson ,  John C. McCosh

IPC分类号： G01R3128

CPC分类号： G01R31/31915

摘要： A network link tester couples to a LAN port with the LAN port having both a network transmit pair and a node transmit pair line. The link detector scans the network transmit pair and node transmit pair lines for the presence of link signals. Upon finding a link signal, the link tester indicates if the link signals were on the network transmit pair or on the node transmit pair line. Further, the link tester determines the network standard used and identifies the available operational nodes. The process of using a LAN tester includes coupling the tester to the LAN port, scanning network lines for the presence of link signals and determining and displaying operational capabilities. Optionally, the link tester may generate a tone signal on the network lines to assist in identifying line faults. Further, the link tester may generate link signals responsive to receive link signals.

摘要翻译： 网络链路测试仪与LAN端口耦合，LAN端口同时具有网络传输对和节点传输对线路。 链路检测器扫描网络传输对和节点传输对线路以存在链路信号。 在找到链路信号时，链路测试仪指示链路信号是在网络传输对上还是在节点传输对线路上。 此外，链路测试仪确定所使用的网络标准并识别可用的操作节点。 使用LAN测试器的过程包括将测试仪耦合到LAN端口，扫描网络线路以确定链路信号的存在并确定和显示操作能力。 可选地，链路测试器可以在网络线路上产生音调信号以帮助识别线路故障。 此外，链路测试器可以响应于接收链路信号而生成链路信号。

公开(公告)号：US07116093B2

公开(公告)日：2006-10-03

申请号：US10768470

申请日：2004-01-30

申请人： Darrell J. Johnson ,  John C. McCosh

发明人： Darrell J. Johnson ,  John C. McCosh

IPC分类号： G01R23/167 ,  G01R19/00

CPC分类号： H04B3/46 ,  H04M3/22

摘要： The tone generator uses a highly accurate frequency signal to generate an accurate and stable tone signal. A cadence pattern may be used to output the tone signal onto a test cable in an easily distinguishable pattern. The tone signal may be selectively output at an in-band band frequency or an out-band frequency. A corresponding tone probe may be used to detect the tone signal. The tone probe uses a high-Q bandpass filter to reject all but the expected frequency of the tone signal. The signal passing the bandpass filter is proportional to the detected tone signal. The tone probe generates an audio signal unrelated to the frequency of the tone signal. The audio signal is modulated by the signal from the bandpass filter, and then broadcast through a speaker. Accordingly, the tone probe provides an audible sound proportional to the strength of the tone signal, but is unrelated in frequency.

公开(公告)号：US07135873B2

公开(公告)日：2006-11-14

申请号：US10656032

申请日：2003-09-05

申请人： John C. McCosh

发明人： John C. McCosh

IPC分类号： G01R31/02 ,  G01R31/11 ,  G01R27/32

CPC分类号： G01B11/024 ,  G01R31/11

摘要： A digital time domain reflectometer system is provided for performing a measurement process that is useful for calculating a cable length. The measurement process starts with a launch controller periodically generating a sync signal for turning a duration signal on. After a known delay time, the launch controller launches a signal on a cable, and if a reflected signal is detected, a detection circuit turns the duration signal off. A counter counts the number of clock pulses in the duration signal. This system is made more accurate by performing the measurement process multiple times and averaging the results. Using the averaged results, and compensating for the added known delay time, the cable length is calculated. An adaptive threshold may be used to enhance measurement accuracy.

摘要翻译： 提供数字时域反射计系统，用于执行对计算电缆长度有用的测量过程。 测量过程从启动控制器开始周期性地产生用于打开持续时间信号的同步信号。 在已知的延迟时间之后，发射控制器在电缆上启动信号，如果检测到反射信号，检测电路会关闭持续时间信号。 计数器对持续时间信号中的时钟脉冲数进行计数。 通过多次执行测量过程并对结果求平均，使该系统更准确。 使用平均结果，并补充已知的延迟时间，计算电缆长度。 可以使用自适应阈值来提高测量精度。