EEVblog 1443 - They Don't Teach This in School! (Coherence)

A follow-up video to the Electrodynamic Shaker, showing you the critical importance of Coherence measurement. Something you'll only get taught in the school of hard knocks!
Using the Ling Electrodynamic shaker, a measurement accelerometer, and a Dynamic Signal Analyser to set up a vibration test system.

00:00 - Electrodynamic Shaker
01:20 - The most inportant thing in vibration measurement
03:56 - What is a Dymanic Signal Analyser?
06:28 - It's all about the system response
08:12 - Your expensive calibrated setup is worthless!
08:44 - What is Coherence?
12:17 - If you've got a really crappy shaker
13:10 - Let's set up a vibration test jig
13:54 - How to power and accelerometer
16:44 - What happens if you leave it flapping around in the breeze?
20:14 - Traps for young players
22:39 - Let's sweep this sucker
26:50 - Tighten your nuts!
28:22 - Show me your coherence plot or GTFO!

Previous Video: https://www.youtube.com/watch?v=1Y2L6QLOi-c

Forum: https://www.eevblog.com/forum/blog/eevblog-1443-do-this!-why-coherence-measurement-is-important/

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