Technology can provide safety in physical practices and improving the

performance of these activities, so manufacturing of equipments for these

purposes has been considered widely. The aim of the present paper was design

and fabrication of three-axis accelerometer. hree acceleration sensors, three

gyroscopes for angular velocity measurement, a microcontroller for converting

analog data to digital, a semiconductor memory for storing the sampled data, a

rechargeable battery and a spreadsheet in MATLAB environment have been

used. In order to examine the validity of fabricated instrument, the earth gravity

acceleration in three perpendicular axes have been measured and compared

with 9.8m/S2. In order to examine the reliability of the fabricated accelerometer

the ICC and test-re-test method have been used. The results showed that the

accelerometer has both reliability and validity. Due to its special features, it

enables us to sample in the offline mode and wireless manner. Such system

may be used for