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This text is a report of the result of examinjng the measuring methQd of the impedance in the impact time ． The change in the impact power characteristic and the influence of the reflection wave were examined by using the signal processing ． The ratio that the re冂 tion wave inf 茎 uences increases when the impact time becomes long ， And ， the difference l〕etween the calculation value and the measurement value inereases ， Next， the relation between 匸 he impedan ・ ce change and the impact power characteristic was examined ． The impedance change does not influence the impact power characteristic，