This part of IS0 7626 provides basic definitions with comments and identifies the calibration tests, environmental tests and physical measurements necessary to determine the suitability of impedance heads, force transducers and response transducers for use in measuring mechanical mobility. This part of IS0 7626 is limited to information which is basic to various types of driving point and transfer mobility, accelerance and dynamic compliance measurements. Blocked impedance (see 4.3) measurements are not dealt with. NOTE - Procedures for carrying out mobility measurements in various circumstances will be dealt with in IS0 7626/Z, IS0 7626/3, IS0 7626/4 and IS0 7626/5.