Dynamic Qualification of High Speed Solder Ball Shear Transducer Calibration

Dynamic calibration of the transducer in a solder ball shear test instrument is difficult because creating a reference dynamic force standard with impulse durations of fractions of a millisecond within the confines of the instrument has not been achieved. However, automated static calibration methods are readily available; unfortunately there is no obvious correlation between the static and dynamic performance of the transducer. This paper describes a dynamic transducer calibration technique which links a dynamic event with a static calibration, allowing the results to be compared and demonstrating correlation. This enables qualification of the dynamic performance of the transducer design through static calibration. Differences between the two methods for a Dage transducer are shown to be within 5%. By many normal standards of measurement this variation may be considered large, but dynamic force calibration is notoriously difficult, so a value of plusmn5% is very reasonable.