2.9.1b arducopter quad that climbs rapidly when alt-hold mode engaged

I've got a DJI F450 quad that performs well enough on stabilize mode, yet when alt-hold mode is engaged, it full throttle climbs.I've followed the threads vaguely related to the subject, and modified THROTTLE_MID from the 500 value, trying both 400 and 600, no appreciable difference.Other posts suggested checking the barometer. The barometer provides values that would semi appropriate to its resolution abilities from when looking at them through the CLI altitude testI started looking through the threads suggesting it was vibrations that were causing the current issue, as the current alt-hold routines rely heavily on the accelerameters, even if GPS lock were in effect or not.I'm not seeing values in az that I believe others posted, I thought I saw others posting values of -9 or -10, I was seeing -1000. This is with motors turned off and the vehicle level on the ground. (positive 1000ish, if I turn it upside down)1.4 mega hardwareAny other suggestions why the alt-hold mode 'climbs for the sky', and how to resolve it?

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Gareth March 25, 2017 at 10:46am

Yes, insufficient vibration isolation between quad and FC. Mounted it on ear plugs
Sky Racer March 25, 2017 at 10:02am

did you get this fixed I have this problem with 3 drones all brand new FC
Gareth May 12, 2013 at 1:36pm

I second that you need more vibration dampening. Had exactly same on my quad and affixed apm on very soft foam with double sided tape. Now perfect.
T3

Richard Boyhan May 11, 2013 at 7:48pm

Regular logs have -10. Tlog shows at a differ net scal or -1000.

Below are some helpful web pages on working with logs.

Logs

There are a few wiki pages where we talk about how to use the dataflash and tlogs here (http://code.google.com/p/arducopter/wiki/AC2_Datalogging), here (http://code.google.com/p/arducopter/wiki/AC2_Record) and here (http://code.google.com/p/arducopter/wiki/AC2_Logs). The last two pages have videos on them where I go through some of the details so that might be useful...
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Gary McCray May 11, 2013 at 6:32pm

Alt Hold does not make use of GPS, but it does rely heavily on accelerometers in 2.9.1b and later.

Your problem is almost certainly being caused by vibration of the flight controller board.

Look on the Wiki here regarding vibration damping. http://copter.ardupilot.com/wiki/vibration-damping/

or the Old wiki here.

https://code.google.com/p/arducopter/wiki/VibrationControl

Four Kyosho Zeal Pads under the corners of the flight controller will probably provide sufficient damping for your copter to perform properly in Alt Hold.

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2.9.1b arducopter quad that climbs rapidly when alt-hold mode engaged

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