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72 Ahh... a PDB and an Omnibus with a current sensor and a 4-in-1 ESC eh?
I'm not 100% certain of how you've wired things up, but this is a tricky one to get right sometimes. As the quad flies well and doesn't fall out of the sky, it does tend to minimise the chances of a short, but I'm at a loss to understand why an external device would show huge peaks in current draw without them actually happening.
What your Omnibus is showing in your video seems about right for the motors spinning at low speed, so let's assume that your current sensor on the flight controller is wired correctly and is working properly.
When the current draw on your external meter rises and falls, the voltage remains constant. If you really were suddenly drawing 48A from your battery, the voltage would certainly drop. There is no way it would still remain stable at 15.53V unless you are running the quad from a high capacity regulated power supply instead of a battery.
Are you using a battery during that test?
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72 OK. Well that kills off that theory.
You say you verified what your power meter was showing with a clamp meter? If so, then I'm completely mystified.
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72 Put it this way:
If the quad flies just fine, calibrate the current sensor using the battery charge method that I described and leave the strange behaviour you are seeing from your power meter as a curiosity.
There's no point worrying about it if everything else is OK and you'll get accurate calibration results using the charge out/charge in calculation.
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