Dynon shunt

[woxofswa]

Yesterday while cleaning my firewall, I discovered that the bridge piece of my Dynon shunt had come loose from its insulator base and was supported solely by the cables themselves.  The tiny screws from the backside of the base had backed out. The airplane has 150 hours.
When it was new I just assumed that the attachment was secure out of the box and didn't tighten or seal it.
I reattached it using the original screws plus a sealant this time.

I suggest that everyone with the same part check the attachment integrity on a regular basis.

Dynon may want to consider a more robust design for the shunt.

 

[lolachampcar]

I checked the resistance of the shunt then picked a wire run within my charge run that most closely matched this resistance. I then used a fixed power supply to power the plane while measuring current draw. It was a two or three iteration process to get the current probe calibration value set in the Dynon software and, viola, no current probe to come apart or short against another object in the cabin