5762N是一种便携式电缆故障定位仪,用于确定两个导体之间或一个导体与电缆护套或接地之间的单个短路故障的位置。仪器可以通过主电源或内部电池供电,当仪器连接到主电源时,内部电池可以重新充电。
5762N同样适用于工厂,查找库存电缆故障或现场定位已安装系统中的故障。
通过手动调节电位计来找到故障,以找到前面板仪表上指示的零点。该仪器使用桥接电路,故障导体的两个部分(故障的任一侧)作为桥梁的一个臂,内部按钮电位器形成另一个。调节电位计直到找到零点,此时可以从仪器读取故障距离,作为电缆长度的百分比。高输入电阻差分放大器电路用于驱动检测器,可以精确定位高达200MW的故障。在桥电路上施加6V的最大电位(限制为1A,或者如果保持10A BOOST按钮,则为10A),因此测试电缆。5762N采用坚固的高光泽外壳,由高抗冲共聚物制成,内部金属副框架增加了强度。关闭时,表壳的防护等级为IP67。
The 5762N is a portable cable fault locator for determining the position of a single shorting fault between two conductors,?or between one conductor and the cable sheath or ground. The instrument can be powered from a mains electricity?supply or from the internal battery which is recharged when the instrument is connected to the mains.
The 5762N is?equally suitable for use in the factory, to find faults in stock cable, or in the field to locate faults in an installed system.
The fault is located by manually adjusting a potentiometer to find the null point as indicated on a front panel meter.?The instrument uses a bridge circuit with the two sections of the faulty conductor (either side of the fault) acting as one?arm of the bridge and the internal pushbutton potentiometer forming the other. The potentiometer is adjusted until the null?is found, at which point the distance to fault can be read from the instrument as a percentage of cable length. A high?input-resistance differential amplifier circuit is used to drive the detector allowing faults of up to 200MW to be accurately?located. A maximum potential of 6V (limited to 1A, or 10A if 10A BOOST button is held) is applied across the bridge circuit?and therefore the cable under test. The 5762N is housed in a rugged highly luminous case manufactured from a high?impact copolymer and featuring an internal metal sub-frame for added strength. When closed, the case is rated to IP67.