B&K hammer test was made monday and tuesday last week with Betsy and Travis on HAM2 and HAM3 chamber for MC1-MC3-PR3-PRM-PR2 suspensions

The measurements have been taken with :

• HAM2 and HAM3 ISI tables locked and suspensions unlocked
• PR3 and PRM vibration absorbers (VA) consequently on and off
• MC1 MC3 PR2 VA on

Pictures attached are showing position of the tri-axis accelerometer, and hammer hit locations for : 

• Picture 1 : MC1
• Picture 2 : MC3
• Picture 3 : PR2
• Picture 4 : PR3
• Picture 5 : PRM

The following pdf document shows the different measurements, with comparisons between VA on / off for PR3 and PRM, and comparisons between LLO and LHO measurements.

As required for the ISI tables, resonnances of the structure below 150Hz (marked by the black dotted line) are damped by the vibration absorbers (page 9 to 12 to see their effects on PRM and PR3)

Data have been exported and plotted following the operations manual wikipage.