Sheila, Camilla, Rahul

The SQZ to OMC mode matching measurement results (posted in alog 91385) had indicated that something is not right with the preload value on ZM4 (s/n 1)- which was recently adjusted from 75in-lb to 65in-lb. 

To confirm the preload value on ZM4 we went back to HAM7 and using two torque wrenches we tried to confirm the pre-load value. We increased the torque values in the increments of 20-40-60in-lbs. After 40in-lbs I felt the torque wrench kept going and stopped at 60in-lb - which meant it was indeed less than 60in-lb. Using the two torque wrench I then increased it to 65in-lb, which is when Sheila suggested that we keep it 60in-lb since it will be a better fit.

Hence, ZM4 preload was set to 60in-lb and double checked using the two torque wrench (with 10% error approximately since they didn't behave exactly the same). I should get an analog (gauge dial) torque wrench rather than this springy thing which doesn't work properly sometimes.

After setting the preload, I set the suspension free and re-connected the PSAMS cable and switched ON the chassis.

The transfer function measurements showed that the suspension was healthy (please ignore the magnitude, this maybe due to incorrect filter changes after changing the coil driver impedence from 1200ohms to 100ohms) after all the work was completed in chamber.