This Technical Report describes the method of three-transducer calibration for calibrating frequencyresponses of absolute sensitivity by means of a reciprocity technique using three reversible acoustic emissiontransducers of the same kind, the method of two-transducer calibration for calibrating frequency responses ofreception sensitivity of an optional acoustic emission transducer by using one acoustic emission transducer,the transmission responses of which have been calibrated by three-transducer calibration, the method forimpulse response calibration for calibrating impulse responses of absolute sensitivity through inverse Fouriertransform of the frequency responses measured by the three-transducer calibration, and the method forrepresenting the calibration results.