This one has a lengthy intro, so bare with me:
I fly an aircraft that uses this device to provide power for an iPad.
https://www.aircraftit.com/Uploads/ContentPages/CMS/Documents/Clara/Tablet-EFB-Systems.pdf
The device states it is made for iPad, and carries the “made for” stamp on it.
However, we have noticed different behavior between different iPads when plugged into this module. Assuming equal charge, OS, same apps opened, some will produce a charge while others won’t.
More specifically:
I know the apple OEM adapters are power supplies that (at least for the iPhone) take two passes at making AC to low voltage DC—smoothing and regulating it.
I haven’t gotten a USB tester inline on it yet to see what the voltage is. I was looking at some inline USB testers on amazon, by X-dragon.
So:
I know it's clumsy but that's all I have for the moment.
Any thoughts are appreciated.
I fly an aircraft that uses this device to provide power for an iPad.
https://www.aircraftit.com/Uploads/ContentPages/CMS/Documents/Clara/Tablet-EFB-Systems.pdf
The device states it is made for iPad, and carries the “made for” stamp on it.
However, we have noticed different behavior between different iPads when plugged into this module. Assuming equal charge, OS, same apps opened, some will produce a charge while others won’t.
More specifically:
- They show the lightning bolt “charging” notation; and
- Some (whether used or asleep) will show a verifiable increase in state of charge; or
- Some (whether used or asleep) will show a noticeable decrease in charge; or
- Some (whether used or asleep) will remain static at whatever battery level it had when attached.
- None of the iPads mentioned here had a problem with the OEM 12W block plugged into a standard 110 outlet.
I know the apple OEM adapters are power supplies that (at least for the iPhone) take two passes at making AC to low voltage DC—smoothing and regulating it.
I haven’t gotten a USB tester inline on it yet to see what the voltage is. I was looking at some inline USB testers on amazon, by X-dragon.
So:
- If the voltage tested isn’t 5.1 I can assume it’s not doing it’s job. I had a home outlet that couldn’t put out a steady 5 for my iPhone and it wouldn’t hold the charge icon—fluctuating.
- What if it tests 5.1VDC and isn’t smooth on that device? Can I even detect that?
- If it isn’t smooth—could that be enough to interfere?
- HOW MUCH voltage is required to produce the “charging” message on the iPad? Is it amps or voltage?
I know it's clumsy but that's all I have for the moment.
Any thoughts are appreciated.