Abstract: A system and method for regulating an adjustable DC supply and continuously and remotely monitoring measurements of reference cell potential and/or current for cathodic protection of a structure is disclosed. Cathodic protection devices use a logic circuit and/or microprocessor based monitor for removing identifiable components and noise from the system to arrive at the DC bias. A method is implemented herein to arrive at the true value of a reference cell potential measurement determined within a sample collection point or window calculated for the reference cell signal while the impressed current is still being applied. This measurement can be compared to a calculated shutdown and is communicated to a central computer accessible via a network such as the Internet. All output is automatically regulated and checked for target window accuracy using an automated voting scheme.

Abstract: A system and method for regulating an adjustable DC supply and continuously and remotely monitoring measurements of reference cell potential and/or current for cathodic protection of a structure is disclosed. Cathodic protection devices use a logic circuit and/or microprocessor based monitor for removing identifiable components and noise from the system to arrive at the DC bias. A method is implemented herein to arrive at the true value of a reference cell potential measurement determined within a sample collection point or window calculated for the reference cell signal while the impressed current is still being applied. This measurement can be compared to a calculated shutdown and is communicated to a central computer accessible via a network such as the Internet. All output is automatically regulated and checked for target window accuracy using an automated voting scheme.

Abstract: An automatic electronic cab signal test set for testing the integrity of a pair of pickup coils and for checking the sensitivity of the amplifier of the cab signal receiver. A mode selector is connected to a clock oscillator which produces clock pulses. The clock pulses are connected to an up/down binary counter which sequentially counts up from zero to a maximum count and then sequentially counts down from the maximum count to zero. The up/down binary counter is connected to a code selector which changes the time constant of an R-C network of a code oscillator. The code oscillator illuminates an idication when the cab signal receiver is under test and modulates the carrier signal of a carrier oscillator. The modulated carrier signal is fed to the input of a constant current source which has its output directly connected to the pickup coils and the amplifier of the cab signal receiver.

Abstract: An electronic cab signal test set employing an integrated circuit code oscillator for producing a code signal and an integrated circuit carrier oscillator for producing a carrier signal which is modulated by the code signal to produce a code carrier signal. The coded carrier signal drives a current source which injects current signals directly into a pair of series aiding pickup coils for testing the integrity of the pickup coils and for checking the sensitivity of the amplifier. An indicating circuit including a voltage sensing device, a switching circuit, and an illuminating device connected to the code carrier for evaluating the condition of the d.c. supply source and for indicating that the test set is properly functioning.

Abstract: A reversible binary counter unit receives periodic clock pulses from associated advance train line apparatus, one pulse at the end of each cycle of operation of the ATL apparatus to vary train propulsion level in car by car steps. The counter adds or subtracts each pulse in accord with the condition of an up/down direction signal representing the sign of the train speed error. The BCD output of the counter is converted into decimal form and applied to a "select and/or" logic network which energizes the train line relay corresponding to the base propulsion level designated by the decimal count and all lower level train line relays. When the counter reaches either count limit, under a corresponding direction signal, further counting operation is inhibited through a logic network.