Abstract
High voltage, short duration capacitive discharge measurements of human body impedance have been accomplished for different paths through the body. Skin contact impedance and internal body impedance between various locations on the body were examined. Impedance measurement instrumentation capable of measuring impedance once every 0.05 μs was used. Voltages of 100 to 2000 V were applied giving peak currents of 0.2 to 5.0 A. The voltage and current waveforms had time constants ranging from 0.2 to 5.0 μs. These short time constants are consistent with safety requirements, allowing testing with people. However, these impedance measurements can be interpreted as limiting values for shocks of longer, possibly lethal duration. The initial total body impedance between the palm of the hand and the sole of the foot was found to be about 500 to 530 Ω. The internal body impedance for the same current path was found to be about 430 Ω. The internal body impedance between the wrist and the calf was found to be about 50% of the internal body impedance measured between the palm and the sole of the foot.
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