Graphs are of the 3 Ft and 1 Ft systems that show pickiting of the spectrium due to having no control over vibrator rate of impact.
We have noted a much larger velocity peak using ED-HALT compared with AIR-HALT running same 2 GRMS.
Graphs are of ED-HALT runing at difrent noted settings. You will see that pickiting is eliminated when the rate is varabile.
Graphs showing the vibration waveform of ED-HALT, AIR-HALT V-1, and AIR-HALT V-9