Products > Test Equipment

Powerbanks tested with DHO800/900

<< < (10/11) > >>

aXit:
What's the UVLO behaviour of the scope for voltages under 11V? 3.66V per cell could be less than 50% capacity used, depending on the exact chemistry.

ebastler:

--- Quote from: jim_griff on May 09, 2024, 02:32:31 am ---For those who are curious, you CAN indeed hook up your Rigol DHO800 directly to a battery. I've tested between 11V and 15V on the bench PSU connected to a USB-C cable and the scope powers up fine. It draws roughly between 3.1A and 2.8A depending on input voltage.

I haven't tested in-depth to see if there are any long-term issues when running at lower voltages, but the fact it powers up shows there is no USB PD negotiation going on, so no trigger board is necessary to "trick" it into working.

--- End quote ---

It's known that the scope works without PD negotiation, since the original power supply (shipped with the very first units only) was a cheap fixed 12V type. The user manual, in section 4.3.2, still describes that supply and specifies a 12V/4A power requirement for the scope.

shapirus:
I would guess that it should work fine down to 10V or maybe even less. Everything gets converted to lower voltages anyway, the highest probably being the fan power rail at its 8V.

If that is so, then the only remaining concern should be the somewhat increased current (compared to 15V and 12V) that the tracks going from the USB socket to the switching converters will have to carry. But unless they are super thin, that shouldn't be an issue.

csuhi17:
I would mainly be interested in the maximum voltage it can withstand. :-BROKE

jim_griff:
I've had it down to 9.3V here (3.1V per 18650 LiIon cell). Was still functioning properly, but I wanted to stop the test there as I didn't want to damage the cells I was using.

With 2500mAh cells (a suspect figure for cheapo cells), I managed to run it for approx. 15 mins, give or take a few mins. Didn't set a timer. When recharging from 3.1V to to 4.15V, the cells each took in an average of 1350mAh.

In terms of the maximum voltage the scope can withstand, I haven't tested haha! I was thinking about testing a 4S LiIon battery (16.8V max), but the scope is a lot of money to put on the line for a simple battery test. Since it works at 12V and quite a bit below, I'm not so happy to test it up to 16.8V. :)

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod