The HP 5450 was based on the HP 2114
8K minicomputer system. This system was used initially to evaluate the potential of using Fourier analysis with transient testing.
A graduate student performed an impact test on a small milling
machine that had been previously evaluated for its chatter char-
acteristics. The modal characteristics and important directional
frequency response functions (DFRF) had been measured using
standard analog techniques of the 1960s, and these characteris-
tics were measured with impact testing. The results were very
encouraging.