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    • 36. 发明授权
    • Portable test receiver for remote monitoring system
    • 便携式测试接收机用于远程监控系统
    • US5317598A
    • 1994-05-31
    • US903648
    • 1992-06-24
    • Irving W. CahalanMichael La ClairPaul SeiterJohn Weber
    • Irving W. CahalanMichael La ClairPaul SeiterJohn Weber
    • G08C25/02H04L27/227H03K9/04
    • H04L27/2272G08C25/02
    • A portable test receiver for field maintenance of a remote sensor monitoring system for underground transformers. The apparatus uses a phase locked loop method to demodulate the DPSK modulation of the remote monitor transmitter. The apparatus is battery operated and easily moved to permit monitoring of spot networks and critical locations for maintenance work. The apparatus features a single software driven display offering good visibility with low current drain. Decoding the transmitter signal is accomplished by using the crystal oscillator circuit of the transmitter is used to generate a reference which is compared to the transmitter signal to detect phase flips. Since the apparatus is battery-powered, there is no AC power to provide "zero" crossing points of the monitored transmitter. Bit timing is provided by taking advantage of the nulls at the 60 cycle "zero" crossings found in the transmitter signal.
    • 用于地下变压器远程传感器监控系统的现场维护的便携式测试接收器。 该装置使用锁相环方法来解调远程监视发射机的DPSK调制。 该装置是电池操作的并且容易移动以允许对现场网络和关键位置的监视进行维护工作。 该装置具有单个软件驱动显示器,具有低电流消耗的良好可见性。 发射机信号的解码是通过使用发射机的晶体振荡器电路来产生与发射机信号进行比较的参考,以检测相位翻转。 由于该设备是电池供电的,所以没有交流电源来提供被监测发射机的“零”交叉点。 通过利用在发射机信号中发现的60个周期“零”交叉处的空值来提供比特定时。