Abstract: A device for detecting the position of a physical defect on a buried pipe includes a leak-of-fluid signal detector, a number of vibration signal detectors, and a device body and can detect the position of a site of a leak, into the ground, of a fluid running through a fluid pipe buried beneath the ground surface. The device body calculates vibration amplitudes and speeds via associated vibration signal detectors with the use of the outputs of the respective vibration signal detectors, calculates cross-correlation functions of the vibration amplitudes and speeds with the use of the vibration amplitudes and speeds and the output of the leak-of-fluid signal detector, calculates the amplitude intensity for each cross-correlation function, and generates resultant vector data representing the position of the leak-of-fluid site with the use of the vibration intensity.

Abstract: A plurality of current transformers connected in series provide secondary winding sides respectively connected to lamps. A constant-current source is provided to supply constant current to these lamps. Each lamp is connected to the corresponding terminal unit including a short-circuit switch for short-circuiting the secondary winding side of the transformer when the lamp is disconnected. A master station issues a request for detecting a disconnected lamp or checking whether or not failure occurs in the terminal unit to each terminal unit in the form of an instant power interruption. Each terminal unit has a proper identification time assigned thereto.

Abstract: In a series lamp circuit designed to connect lamps to the secondary windings of current transformers connected in series with a constant-current power supply, the series lamp circuit provides a disconnected lamp detecting means and a short-circuit switch for each lamp. The short-circuit switch serves to short-circuit the secondary windings of the transformers in response to the output of the detecting means. By actuating the short-circuit switch, the short-circuit switch is switched off during a short-circuit releasing time defined uniquely for a lamp at each predetermined inspection period. The power device side serves to detect the quantity of disconnected lamps on the basis of the output voltage and current and detect an OFF operating time of the short-circuit switch on the basis of an output voltage waveform of the power supply. Hence, it is possible to identify which lamp is disconnected and display the identified result on a display. An alarm is issued when the disconnected lamp is detected.

Abstract: A data processing system for error processing and an error processing method, which system includes a main memory (M), an information processing unit (A), an error processing unit (EP) and an alternate memory. When an error arises in a portion of the main memory, corrected information is stored in the alternate memory. Then, under the control of the error processing unit, the alternate memory is employed instead of the malfunctioning portion of the main memory. The alternate memory is adapted to be used only when the error is a fixed error or a burst error, in order to avoid a system shut-down caused by fixed-and soft-errors or burst-and soft-errors which occur during information processing. The alternate memory, therefore, is not used in a case where the error is a soft error. This imparts an additional advantage in that the size of the memory is reduced.

Abstract: A lamp circuit is provided having a constant current-type AC power source and a plurality of isolation transformers coupled in series with the AC power source. The secondary circuit of each isolation transformer is connected to an electric lamp. The output voltage of the constant current-type AC power source is detected to determine the times when the output voltage crosses the zero voltage level. A disconnected lamp in the circuit results in a distortion of the output voltage waveform due to the magnetic-saturation characteristics of the isolation transformer coupled to the disconnected lamp. The output voltage waveform is integrated over time between the time periods when the output voltage signal crosses the zero axis. The result of the integration is compared with a reference value. When the integrated value exceeds the reference value, an alarm signal is generated. The number of disconnected lamps may also be determined and displayed.