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Siglent SDL1000X/SDL1000X-E Electronic Load

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pmendiuk:
I have been testing various ACDC power supply modules from Amazon and I had a 12V 600W power supply fail in a spectacular fashion with a 50A combined load.  I had a 25A CC load (300W) with a "upgraded" firmware (1.1.1.21R2) SDL1020X-E and a KP184 set at 25A CC load (300W).  The KP184 didn't flinch and is still functioning normally.  The SDL1020X-E provided no load after the failure so I pulled the metal cover off to take a look.  I didn't see any obvious carnage so I powered the unit back up and it was functioning normally again about 30 minutes later.  I started testing again today and the SDL1020X-E seemed to be fine until I turned on the additional parallel load with the KP184.  The SDL1020X-E load current dropped after ~5 min to about 2mA and there has been no "recovery" as before.  I'm suspecting that the previous power supply failure was likely not a good experience for the load MOSFETs unless someone has some other ideas?

tautech:
Had a discussion with a customer just a day or 2 back about his load....some lesser known Asian brand that I never noticed but to cut a long story short its negative terminal was mains earth bonded and as such had destroyed some projects he was working on.....put him right off the thing.  :rant:

We all need keep our eyes open for such bad design.  ;)

pmendiuk:

--- Quote from: tautech on May 05, 2023, 11:50:53 pm ---Had a discussion with a customer just a day or 2 back about his load....some lesser known Asian brand that I never noticed but to cut a long story short its negative terminal was mains earth bonded and as such had destroyed some projects he was working on.....put him right off the thing.  :rant:

We all need keep our eyes open for such bad design.  ;)

--- End quote ---

There are no load output earth ground connections in my relatively new KP184, but I have no experience with the older units.

If someone would have asked me which load seemed more robust I would have previously said the SDL1020X-E.  I would like to get the schematic for the SDL1020X-E and see what happened to it.

Self Bias:

--- Quote from: pmendiuk on May 05, 2023, 11:43:35 pm ---The SDL1020X-E load current dropped after ~5 min to about 2mA and there has been no "recovery" as before.

--- End quote ---

Did you try turning it off and on again?

No seriously: The SDL performs a self test at boot. I don't have my unit here at the moment, but I think it could be triggered from the System menu as well - though I'm not sure if that actually runs the test or just shows the results.

One of the items tested is "Load", which I would assume are the FETs. Would be interesting to see if that test fails in that state.

mawyatt:
Request for tautech.

Rob, could you ping Siglent about a user means to calibrate the SDL1000X ?

We've read the post about writing specific cal numbers to specific memory locations, but that seems risky for our case.

Ours is considerably off in Voltage and Current readings relative to our many DMMs.

Just recently we needed to validate a Korad KWL102 (30V/30A) power supply for a client/colleague, the Korad agreed well with our KS34465A or DMM6500, however the SDL load wasn't doing as well which required us to monitor the setup with a pair of DMMs. This is the type of usage that the SDL should be able to handle without the need for additional support equipment where one can rely on the Voltage & Current readings directly from the SDL.

Anyway, a ping to Siglent home base for a SDL User Calibration Routine would be greatly appreciated.

Best, 

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