Products > Test Equipment
Siglent SDS804X HD - No USB Power From Scope ? *Got Power But Trips Port*
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TomKatt:

--- Quote from: mawyatt on July 16, 2024, 10:11:23 pm ---Tom,

Just tried with our DP10007 and SDS800X HD without any problems, even tried using a cheap Yuanxin USB extender port (3) which has a Mouse Wireless USB also plugged in, with same results.

Scope boots up fine and can plug unplug DP without any issues.

Seems somethings not behaving with your items?

Best,

--- End quote ---
Yes - I do think something is amiss.  Hopefully it’s the probe and not the scope.  I’ll try the probe on my other scope tomorrow and see what happens.  Although my meter isn’t fast enough to capture the complete spike, it still only registered a max of 264ma, which shouldn’t cause any issues.  But it's obvious the scope is NOT happy trying to power up the probe.  Finding another power source is a lot easier than trying to RMA the scope, which works perfectly in every other respect.  We’ll see how things progress.

Thanks for your input !

Edit - I've got more faith in Siglent than the Micsig probe lol.  I also just plugged a wired mouse into the scope and it works perfectly.  Granted the mouse probably uses less current, but still enough for an led, camera, ucontroller etc.  Nevermind - the mouse peaks at 25ma and immediately drops to 3ma...  A lot more power efficient that I'd have expected.
Martin72:
Hi,


--- Quote ---*Resolved*
--- End quote ---

And what is the solution now?
TomKatt:

--- Quote from: Martin72 on July 16, 2024, 11:14:02 pm ---Hi,


--- Quote ---*Resolved*
--- End quote ---

And what is the solution now?

--- End quote ---
Well, I've got power and the scope appears to be working correctly.... I didn't want to leave a post up inferring otherwise.

But you are correct - further investigation is needed and will continue.  I should have phrased that differently (done).
TomKatt:
OK - now I'm a bit nervous...  Plugged the DP10007 probe into my SDS1104X-E and it immediately powers up and works exactly as it should.   So, my new SDS804X HD scope looks like it's overly sensitive for some reason.  As best I can tell, the probe only spikes no more than 300ma at power up and almost immediately falls to ~200ma - that should not be an issue.

I'm not sure if it's worth going through a warranty process for this as I have discarded the original shipping carton and realistically I can just use a dedicated power supply for the probe, which I use infrequently anyway.

Would anyone have ideas to better test this?  I'm trying to think of some USB devices that should work with the scope that consume more current than a mouse or keyboard, as those low power items work correctly...   Perhaps a portable spinning hard disk?  I don't have a low power current probe - I've only tried running the usb power through my BM235 multimeter set to capture min/max/avg.

Edit - should also mention that whatever 'circuit breaker' trips on the SDS804X HD affects both front and rear USB ports.  Tripping one with the probe shuts down both ports.
pdenisowski:

You're overlooking the holy grail of T&M:  the opportunity to use a T&M instrument to troubleshoot itself ....  :) 

But in all seriousness: a USB load tester like this might help

https://www.amazon.com/DROK-Electronic-Adjustable-Intelligent-Temperature/dp/B07FL3PS57

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