Products > Test Equipment
Siglent SDS804X HD - No USB Power From Scope ? *Got Power But Trips Port*
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Martin72:

--- Quote from: pdenisowski on July 17, 2024, 12:25:46 pm ---Oohh ... fancy!  Looks like this forum just cost me another 50 bucks :)

--- End quote ---

The forum just cost me €16:

USB Cable Tester

 ;)
watchmaker:

--- Quote from: TomKatt on July 17, 2024, 10:04:08 am ---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.

--- End quote ---

I just tried my DP 10013 in my SDS824 using the Siglent supplied USB cable to connect to the A connector on the probe.  Both the rear and the front USB ports provide power no problem.  Latest scope FW.

Also worked with my 1204.
TomKatt:

--- Quote from: Martin72 on July 17, 2024, 01:58:17 pm ---
--- Quote from: pdenisowski on July 17, 2024, 12:25:46 pm ---Oohh ... fancy!  Looks like this forum just cost me another 50 bucks :)

--- End quote ---

The forum just cost me €16:

USB Cable Tester

 ;)

--- End quote ---
I've gone down rabbit holes numerous times because a usb cable looked ok but was either damaged or was one of those evil 'charging cables' that lacked data lines...  Might as well add it to the shopping cart  >:D
TomKatt:

--- Quote from: watchmaker on July 17, 2024, 02:00:39 pm ---I just tried my DP 10013 in my SDS824 using the Siglent supplied USB cable to connect to the A connector on the probe.  Both the rear and the front USB ports provide power no problem.  Latest scope FW.

Also worked with my 1204.

--- End quote ---
Thanks!

It would seem that the problem is in my new SDS804X HD scope...  At this point I'm just working through the issue to satisfy my curiousity but I doubt there's anything I can do to resolve it short of trying to RMA the scope, which is probably more of a hassle than anything.  Though I'll always wonder if this is some kind of indication of future issues down the road - a difficult decision.
TomKatt:
And the mystery continues  :o

Got busy and left the DP10007 probe running on my SDS1104X-E all day.  Brought the probe home and figured I'd just see what happens with my SDS804X HD...  It powered right up no problem.  Unplugged it and plugged it back in several times, works fine.  Powered off the scope and rebooted - works fine  :-//

The DP10007 probe is new, but old stock - I think it was produced in 2022 or earlier and yesterday was the first time it was powered on since it was shipped from the factory.  What are the odds that some power supply caps went a bit south and running it for 8 hours gave them an Italian tune-up or something?  I know that capacitors shouldn't fail like that in just a few years, but with some of the cheap components these days I wonder.

Anyhoo, things are looking good and I ended up ordering some new test gear in the process.  I've had worse days  :P

Edit - now that everything is operational I got the chance to use the DP10007 on the vacuum tube scope I'm working on.  I know the DP10007 has some CMRR issues from Dave's investigation, but for my use at frequencies <100KHz it actually seems to work quite well, and definitely a lot safer than standard probes in several hundred volt circuits.  For the price I paid, it's a bargain  8)
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