Motor Balancing - Vibration Analysis, any suggestions?

[pious_greek]

I'm looking to follow Rolands888's footsteps by upgrading to tiger motors and then fine tuning the balance. I was wondering if anyone has any suggestions on putting together a rig similar to what he had done before. Is the sensor ideally placed perpendicular to the motor's axis of rotation? Should the motorpod and vibration sensor be fixed to a solid object or allowed to move freely? Any experience or insight anyone wishes to share?

I know it can be done well enough with with an iPhone, but that doesn't bring me any satisfaction.

http://3drpilots.com/attachments/imgp4639-jpg.2058/

 

[fpvsteve]

All you need to know about how to measure vibration is written here:
Measuring Vibration — Copter documentation

Adding iPhones, additional sensors etc is simply nonsense.