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EEVblog #1023 - Rigol DL3021 Electronic Load Teardown

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EEVblog:
Dave teards down the new Rigol DL3021 Electronic load and has a play around with it.

http://emona.com.au/products/electronic-test-measure/electronic-loads/dl-3021.html#.Wb7yY7Kg9hE





paulcav:
"teards" that's a new word? :)

mikeselectricstuff:
If Rigol ever want to be taken seriously as a major T&M company they're going to have to do better than this. OK loads are a relatively niche product, but bad design ( graphic or otherwise) reflects across the whole product range.

The voltage regulator thing is just ridiculous - even they can't design a sufficiently quiet switching reg, they've got a sodding great heatsink in there they could have used. 

The graphic design aspect reminded me of the laughably awful Neoden video - seems like the Chinese would rather do a bad job themselves than hire someone that knows what they are doing. 
 
I really can't see any Chinese company reaching the same level of brand reputation as the likes of  Keysight, Tek, Keithley, R&S etc. 

theorbtwo:
Thought this might be an interesting watch, considering that I've been having lots of fun reverse engineering a ds1054z lately.
https://youtu.be/Tk_3rYKWIIg?t=826 looks a lot to me like that is the main CPU of the whole thing -- that's a freescale MC i.MX, the same series of processor that powers the ds1054z.  Hopefully a rather newer one ... nope.  it's the i.MX283, very very similar to the i.MX286 that powers the ds1054z scope.  Freescale considers that a legacy processor, so I'm rather surprised they went with something so old.
  There's also both RAM and flash on there.  Nicely, they've given us a couple of nicely marked 0.1: unpopulated connectors on the top -- ARM-JTAG and BOOT.
I also wonder a bit if that's a real PCI card.  It's not out of the realm of possibility, and it'd be somewhat handy during product development.
Also, note that it's called DigitalBoard in the silkscreen, not IO, or peripherial, or back-panel or the like.

(And there's the same 5-pin diagonal FPGA JTAG connector.)

... yeah, he's coming to the same conclusions as I did, just a bit slower.

Anyway, the design is very similar to the scope, in terms of what chips they are using.  The difference is that they've moved to more boards, which means they can mix and match better and hopefully put out products quicker.  I am still surprised they've gone with such an old CPU, though.

technogeeky:
Someone beat me to it on YouTube comments, but I'm pretty sure that the problem with the wheel is essentially a PEBKAC. The green underline is selecting which decimal place is currently wheel controlled. Presumably some action (pressing the wheel in?) will cause the selected decimal place to shift (to the left, since the rightmost one is currently selected around 22 minutes in).

If you select the tenths or ones place, perhaps it could actually have velocity or acceleration or whatever and you might have missed it.

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