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    • 2. 发明公开
    • LOCATOR SELF-TEST
    • 定位器自我测试
    • EP3108271A1
    • 2016-12-28
    • EP15752043.8
    • 2015-02-18
    • Metrotech Corporation
    • POLAK, Stevan
    • G01V3/11G01V3/08G01R29/08G01V3/06G01V13/00
    • G01R35/005G01R29/0814G01R35/00
    • A detection apparatus with a self-test is presented. A detection apparatus such as a cable locator has an array of sensors in the form of ferrite antennas to detect an electromagnetic field produced by an object such as a buried cable. The signals are amplified, digitized and fed to a processing unit that outputs a detection signal to a display to indicate the detection of a cable. A programmable signal generator outputs a self-test signal via a voltage-current converter that is used to check the balance between the sensors. The self-test signal is directly coupled into each of the sensors through a wired connection and the processing unit uses the self-test signal to accurately determine the magnitude and phase balance of the sensors. The magnitude and phase data may be used to calibrate the instrument, apply data corrections or flag errors.
    • 提出了具有自检的检测装置。 诸如电缆定位器之类的检测装置具有铁氧体天线形式的传感器阵列以检测由诸如埋地电缆的物体产生的电磁场。 信号被放大,数字化并且被馈送到处理单元,处理单元向显示器输出检测信号以指示电缆的检测。 可编程信号发生器通过电压 - 电流转换器输出自检信号,用于检查传感器之间的平衡。 自测信号通过有线连接直接耦合到每个传感器,处理单元使用自测信号来精确确定传感器的幅度和相位平衡。 幅度和相位数据可用于校准仪器,应用数据校正或标记错误。