Products > Test Equipment

Siglent SDL1000X/SDL1000X-E Electronic Load

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tautech:

--- Quote from: Mortymore on September 27, 2023, 11:36:53 pm ---It would be interesting to replicate today, at least some of the tests Timpert made 4 years ago to see what the hardware and software revisions and updates had solved, or not.

--- End quote ---
HW changes are never disclosed.

Mortymore:
My observation


--- Quote from: Mortymore on September 27, 2023, 11:36:53 pm ---It would be interesting to replicate today, at least some of the tests Timpert made 4 years ago to see what the hardware and software revisions and updates had solved, or not.

--- End quote ---

was in the sequence of what nctnico said about the SDL having ripple issues according to what was written in page 3 of this thread back in 2019
 

--- Quote from: nctnico on September 25, 2023, 11:43:01 pm ---
--- Quote from: Martin72 on September 25, 2023, 08:50:52 pm ---Hi folks,

I must admit that I´m too lazy to read the whole thread now... ;)
My test equipment is missing two things, a SA and a electronic load.
Short question:

https://www.batronix.com/versand/last/SDL1020X-E.html

Recommendable? any issues/traps ?

--- End quote ---
From page 3 it looks like this Siglent load has a similar mains ripple issue like the Korad DC load I got recently.

--- End quote ---

I realise now that I should have inserted quotations in my previous message to make this clear

I was not expecting that Siglent reveals anything, but instead with some tests, the SDL reveals itself, if some of the "not so good" things reported by Timpert back then, as the ripple issues, was solved or not, from (updated) tests and not from what Siglent may or may not state it was done/solved.

I appreciate so much when a user does this sort of testes, as Timpert did, since it's a great opportunity to learn more, be wiser about to what to expect from a device, and for sure this will show to the "brand" (Siglent in this case) that the users are aware of some issues that a product may have, and working in benefit of both, improve the product if needed.

Johnny B Good:

--- Quote from: tautech on July 19, 2023, 08:16:30 pm ---Banana lead capable input terminals were mentioned in some other thread so followed an old link in this thread to find they are still readily available:
https://www.aliexpress.com/item/32778229464.html

--- End quote ---

 That's not a bad price if you actually need two pairs of red/black connectors but I only needed one pair.

 I've just ordered a red and a black 6mm to 4mm banana plug binding post adapter from here,
https://www.aliexpress.com/item/1005005474135340.html

  for a total vat and shipping to the UK inclusive price of £6.63

I'm in the middle of my mark III GPSDO project and have a bad case of "AJ Rimmeritus" (Red Dwarf reference) and my presence here is by way of distraction therapy, hence this belated alternative suggestion (Ebay no longer list these items).

 However, I'd still like to know whether anyone has ever managed to activate the OTP protection on their 'hacked to 300 (or higher) watt SDL1000X-E loads. I never managed to do so, even when I pushed the hotter (monitored) end of the heatsink way past the stated 85 deg C limit to some 93 deg C or so (200 deg F).

 For some reason, I'd assumed a total of just ten IRF250p devices when originally calculating the thermal margin per device. Teardown movies clearly show a total of twelve meaning some 25 watts per device for a 300W loading. The thermal specs for the IRF250p indicate a thermal gradient Jncn to heatsink of just under 1 K/W when directly mounted onto a thermally greased flat heatsink surface. In this case, Siglent have been obliged to use silpads which, at a best and conservative guesstimate, might double the thermal gradient to some 2 K/W ( 50 K rise for 25W of dissipation).

 With no safety margin for error, this implies a maximum heatsink temperature limit of 125 deg C (it might be another 5 or 10 degrees higher). With this in mind, I'm left wondering if Siglent have raised the OTP cut out temperature by another 10 to 15 degrees without updating the user manuals or whether the OTP function in mine is faulty in some way.

mawyatt:
A few weeks ago we ran ours at over 300W for some time without issue, we are emulating a 30 amp motor load for a Solid State Switch we had developed.

Those terminal do look attractive and tempting  :)

Best

Johnny B Good:
@mawyatt,

 Thanks for providing that information. I don't suppose you tried measuring the heatsink temperature with a thermocouple? My original tests can be found here https://www.eevblog.com/forum/testgear/siglent-sdl1000xsdl1000x-e-electronic-load/msg3937981/#msg3937981

 Also, a few posts further down, arcitech posted about increasing the power limit above the 300W mark here https://www.eevblog.com/forum/testgear/siglent-sdl1000xsdl1000x-e-electronic-load/msg4229470/#msg4229470

 Presumably, you followed his lead?  :)  I guess if we can trust the OTP to kick in before any of the IRF250ps suffer a meltdown, it should be safe enough to raise the max wattage to, say, 350W (at least as far as arcitech's usage case with discharging a 6S LiPo battery pack is concerned).

 However,I wouldn't care to rely on the OTP if its trip point was any more than 15 degrees higher than its published 85 deg limit which is why I'm so interested in the actual OTP trip temperature.

 I don't suppose you'd be using those temptingly attractive terminals with 30A loadings.  :) They'd be more of a convenience to connect sub 10A power sources (small sub 20W dc-dc converters for example). I took a look at those 8/6mm spade to 4mm banana loudspeaker converters but the pricing, aimed at the audiophile market demographic, rather put me off, leading me to explore a much cheaper DIY alternative using solder connected in line 4mm banana jacks with a 3 or 4 inch 8/6mm spade ended 12 AWG flylead.

 The problem with this solution being the misuse of a male banana connector on the end of a cable connected to a power source. The only safe way to use 4mm banana connectors being to use only the safety shrouded type, preferably with the male connector used on the short flylead connection to the load to eliminate the temptation to use an unshrouded male banana plug on the end of the cable connected to the power source.

 I could find in-line shrouded 4mm male banana connectors ok but not any corresponding female connectors other than back to back gender bending connectors which, apart from adding more contact resistance and length, would reintroduce the temptation to use unshrouded male banana plugs.

 I gave up this search for "Unicorn droppings" and decided that since I couldn't find a 'safe' solution, I might as well be damned and go for those 6mm terminal to 4mm banana adapters since they'd be no less safer an option than those overpriced loudspeaker adapters. It just means I'll have to make sure to disconnect at the DUT end of the connection before pulling the banana plugs at the load. A rule that should be followed regardless of the safety of the connectors anyway.  ::)

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