Abstract:
PROBLEM TO BE SOLVED: To provide a sampler that has a small amount of measurement jitter, high measurement frequency and measurement accuracy, and requires low costs, and to provide a measurement method. SOLUTION: A trigger current Itr for determining measurement timing is created on a sampler chip 11 by a signal current Is to be measured, and a comparator circuit 20 outputs an SFQ pulse when the current sum of a feedback current If and the like in trigger current Itr input is larger than the threshold of the comparator circuit 20. Then, the waveform of the signal to be measured is observed based on the number of output SFQ pulses from the comparator circuit 20 within fixed time.
Abstract:
PROBLEM TO BE SOLVED: To provide a surge current detection device which can be mounted easily in a conductor and accurately detects a surge current entering the conductor.SOLUTION: A surge current detection device 30 is mounted freely removable with respect to a conductor 11 and configured to detect a surge current entering the conductor 11. The surge current detection device 30 comprises a holder 40, a magnetic force centralizing member 60 of which the cross section is U-shaped approximately, and a magnetic substance sheet 70. The holder 40 holds the conductor 11 freely removably by means of first and second confronted holder bodies 40-1 and 40-2. The magnetic force centralizing member 60 is fixed inside the holder 40 and centralizes a line of magnetic force forming a magnetic field generated by the surge current entering the conductor 11 into a predetermined detection area with high density. The magnetic substance sheet 70 is fixed inside the holder 40 so as to be positioned in the detection area and detects the surge current.
Abstract:
PROBLEM TO BE SOLVED: To provide a low-priced current detection apparatus which is capable of improving workability during assembly.SOLUTION: A current detection apparatus comprises a first magnetic substance section 12 which forms a part of a magnetic circuit while being disposed to surround a conductor 11 on a surface orthogonal to a direction of a current to be measured that flows in the conductor, a sensor section 13 which is disposed on a magnetic path of the magnetic circuit for detecting a magnetic field, a first insulator section 14 which is provided to cover the first magnetic substance section and the sensor section, and a second magnetic substance section 15 which slides away from the first insulator section to shift to a conductor integration enabled state, slides closer to the first insulator section after the integration of the conductor to be disposed to surround the conductor on a surface orthogonal to the direction of the current to be measured that flows in the conductor, and forms another part of the magnetic circuit.
Abstract:
PROBLEM TO BE SOLVED: To accurately detect a surge current penetrating for a short time of time. SOLUTION: A protection element (such as an arrester 12) protects an apparatus 25 to be protected from surge currents i penetrating into line terminals L1, L2 or a grounding terminal E. Surge current detection devices 30-1 to 30-3 are provided on respective conductors 11-2, 11-3, 11-5 connected to the arrester 12. Each of the surge current detection devices 30-1 to 30-3 includes a magnetic flux concentration member 40 by which a magnetic flux produced by the penetrating surge current i is concentrated in a given detection area in high density, and a magnetic material sheet 50 positioned on the given detection area. The magnetic material sheet 50 includes a recording layer capable of recording and erasing the penetration state about the surge current i. A plurality of microcapsules, in which magnetic particles varying their magnetic orientation by a concentrated magnetic flux are sealed in a state suspended in a liquid, are arranged in the recording layer having a structure visually recognizable from outside. COPYRIGHT: (C)2011,JPO&INPIT