METHOD OF RECORDING MECHANICAL MAGNITUDE AND RECORDER FOR METHOD EMBODIMENT Russian patent published in 2002 - IPC

FIELD: nondestructive material testing. SUBSTANCE: magnitude is measured in frequency range of from f₁ to f₂ by means of primary transducer; signal from said transducer is converted into digital signal at digitization frequency f_dicr and is furnished to on-line storage. Digital signal is compared with threshold level; in case it does not reach said level, analog- to-digital conversion of signal is effected with storage switched-off at frequency of 2f₂<f<f; in case it reaches or exceeds said level, signal is loaded in storage during time T_st≥1/f₁ and is transcribed to energy-independent storage. Recorder has primary transducer and electronic unit for preliminary processing of signal. Primary transducer and electronic unit are arranged in one casing. Electronic unit is additionally provided with electrically programmed energy-independent storage. EFFECT: enhanced durability with out replacement of supply battery; reduced influence of temperature on readings; avoidance of unauthorized operation. 6 cl, 3 dwg