the heart of the load cell directly on the load string axis the arrangement and depths of hole 28 and recess 29 are such that the accelerometer senses the load acceleration of the hub of the load cell nearer to the test object this removes the risk of errors in the acceleration reading resulting from off center loading in comparison with the previous attempt to provide a solution to the problem this has the following advantages a the accelerometer is on the load line eliminating u201c abbe u201d measurement errors b the accelerometer is rigidly connected to the adjacent grip eliminating amplitude and phase errors the conditioning of the acceleration signal is handled as standard and is set up automatically when the system is auto tuned this means that time is saved and operator errors reduced for users who wish to do this themselves they have the option to switch this feature on or off and set the correction factor manually the resulting signal is then subtracted from the load cell signal that is where k is the correction factor and a c is the signal from the accelerometer 31 the result is that f cell f specimen for completeness a block diagram of the electronic circuitry for producing a compensated signal is shown in fig3 the circuitry consists of three basic components namely the circuitry 33 associated with the load cell digitising circuitry associated with the circuitry 33 and digital signal conditioning and inertia compensation embedded software 35 associated with the digitising circuitry 34 in order to conduct a dynamic test a drive signal is derived from a sine wave excitation look up table 40 and supplied to the force measuring transducers 22 in the load cell.