Taka Y.,National Institute of Technology, Kushiro College |
Ishida T.,Noise Laboratory Co. |
Fujiwara O.,Nagoya Institute of Technology
IEEJ Transactions on Fundamentals and Materials
In the electrostatic discharge (ESD) immunity testing specified by the IEC 61000-4-2, an ESD generator simulating a human ESD is normally used for contact discharges, while air discharge testing is also being accepted despite the fact that the testing is likely to provide inconsistent test results from the poor reproducibility of discharge current waveforms. To confirm to what extent air discharges affect the discharge currents with respect to charge voltages and approach speeds, we measured the discharge currents through a hand-held metal piece with fast and slow approaches from a male subject charged from 1000 V to 8000 V, which were calculated from two equivalent circuits. An equivalent circuit with an ideal switch in view of a spark was used to show the limit waveform of the discharge current through the inverse Fourier transform from the measured human impedance. The other equivalent circuit consisting of a time varying spark resistance and lumped circuit parameters derived from the human body impedance was used to estimate the discharge current based on a spark resistance formula. As a result, we found that the first equivalent circuit provides the maximum current peak and minimum rise time of discharge currents regardless of the charge voltages or approach speeds, while under an appropriate spark length according to the charge voltage the second equivalent circuit gives the discharge current waveform that approximately coincides with the measured result. © 2016 The Institute of Electrical Engineers of Japan. Source
Noise Laboratory Co. | Date: 2014-10-14
An emission signal visualization device includes a front video camera for photographing a measured object from the front, a signal detecting sensor for detecting an emission signal generated from the measured object, a lateral video camera for photographing the signal detecting sensor from a lateral, a spectrum analyzer, and an analyzing body unit, and records and analyzes the state of the spatial distribution of signals detected by the signal detecting sensor.
Noise Laboratory Co. | Date: 2014-01-23
[Problem to be Solved] To provide an antenna which can be used in a wide band. [Solution] An antenna
Noise Laboratory Co. | Date: 1991-07-09
ELECTROMAGNETIC INTERFERENCE NOISE SENSOR, NOISE COUNTERMEASURING UNITS, NOISE CATCH COUNTER, NOISE AND DIP RECORDER, IMPULSE NOISE SIMULATOR, HIGH VOLTAGE IMPULSE NOISE SIMULATOR, COMPUTER CONTROL NOISE SIMULATOR, ELECTROSTATIC DISCHARGE SIMULATOR, VOLTAGE DIP SIMULATOR, VOLTAGE DIP AND UP SIMULATOR, DC VOLTAGE DIP AND UP SIMULATOR, POWER LINE DISTURBANCE DETECTOR, LIGHTNING SURGE SIMULATOR, SURGE WITHSTAND CAPABILITY SIMULATOR, VOLTAGE SURGE SIMULATOR, FAST TRANSIENT NOISE SIMULATOR, ELECTRICAL SPIKE SIMULATOR, AUTOMOTIVE TRANSIENT SURGE SIMULATOR, NOISE CANCELER, NOISE CANCELER TRANSFORMER, IMPULSE NOISE FILTER.
Noise Laboratory Co. | Date: 1985-05-28
Simulators-Namely, Impulse Noise Simulator, Voltage Dip Simulator, and Electrostatic Discharge Simulator.