Author Topic: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown  (Read 20496 times)

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Offline Rbastler

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #75 on: September 25, 2017, 09:28:24 pm »
I have to admit that my confidence in Rigol is severely shaken, the scope i have is nice but clearly they went bananas over scope design as it's the first and most desired product, but can they make anything else properly? maybe not.

I do like the DP832 and DM3068 very much, no issues or complaints so far.
I wound'nt say may confidence in Rigol is severely shaken but it certantly made me think again, if that e-load is good for my purposes and if Rigol is the only real good deal here. I think it still is though, because there arent valid alternatives for me, but I dont have the good feeling when thinking of buying it, I had with other Rigol gear.
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Offline Monkeh

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #76 on: September 26, 2017, 03:35:58 am »
The heat sink temperature at some 80 C is not such a disaster - they may fix it in future versions. Also the 240 V volts in Australia give the regulator is little more stress than 230 V in Europe.

Quote
Maximum AC voltage today     : 250.70 volts
 

Offline mcinque

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #77 on: September 26, 2017, 07:30:57 am »
For me Rigol has simply missed price vs specs. If the load had the same price/specs as the dp832 (even with his issues) they would have take the market for hobbists/entry level gear. Instead, they made something that isn't good enough and, most of all, it's overpriced. It can't beat Maynuo for me, both for hardware and software.
« Last Edit: September 26, 2017, 07:33:07 am by mcinque »
I'm basically still a rookie and because of this, even with the best intentions, I often say bullshits
 

Offline SharpEars

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #78 on: September 29, 2017, 12:24:07 pm »
The cheap obsolete $0.60 Chinese fake MOSFETs they use in the electronic load, IRFP250n are not even characterized for DC operation or even operation beyond a 10 ms pulse, correct me if I am wrong here.

Good luck with the longevity aspect of this electronic load, since we don't even know if they are operating the MOSFETs in their safe operating area or if there even is a safe DC operating area:



They should have spent several dollars per MOSFET, used fewer of them, and gotten MOSFETs that are characterized to DC like the Linear L2 series from IXYS.

For example, the IXYS IXTP80N075L2-ND go for $3.20 in quantity (probably much less B2B) and are characterized all the way down to DC (not to mention have better characteristics being also 30 Amp MOSFETS):




« Last Edit: September 29, 2017, 01:26:50 pm by SharpEars »
 

Offline NANDBlog

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #79 on: September 29, 2017, 07:10:28 pm »
The cheap obsolete $0.60 Chinese fake MOSFETs they use in the electronic load, IRFP250n are not even characterized for DC operation or even operation beyond a 10 ms pulse, correct me if I am wrong here.
This was only discussed for 4 pages now.
 

Offline schopi68

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #80 on: October 04, 2017, 07:05:24 pm »
For me Rigol has simply missed price vs specs. If the load had the same price/specs as the dp832 (even with his issues) they would have take the market for hobbists/entry level gear. Instead, they made something that isn't good enough and, most of all, it's overpriced. It can't beat Maynuo for me, both for hardware and software.

Hardware on the Maynuo is something i would not throw into the discussion. In my opinion the Maynuo is 20 years back. No isolation from the rear panels, no specs about the maximum isolation voltages above ground, no interfaces more than RS232... unspecified slew-rates and overshot problems.

« Last Edit: October 05, 2017, 02:52:36 am by schopi68 »
 

Offline ass20

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #81 on: November 01, 2017, 04:21:12 am »
hi
 what is adc and dac used in rigol load ?
 

Offline mcinque

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #82 on: November 01, 2017, 07:39:06 am »
Hardware on the Maynuo is something i would not throw into the discussion. In my opinion the Maynuo is 20 years back. No isolation from the rear panels, no specs about the maximum isolation voltages above ground, no interfaces more than RS232... unspecified slew-rates and overshot problems.
So Maynuo is not the perfect load and has his limits (so the BK ones and other clones), but does this change anything about the Rigol as acceptable load with all the issues we're discussing here?
I'm basically still a rookie and because of this, even with the best intentions, I often say bullshits
 

Offline Rbastler

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #83 on: November 02, 2017, 08:45:27 am »
For me Rigol has simply missed price vs specs. If the load had the same price/specs as the dp832 (even with his issues) they would have take the market for hobbists/entry level gear. Instead, they made something that isn't good enough and, most of all, it's overpriced. It can't beat Maynuo for me, both for hardware and software.

Hardware on the Maynuo is something i would not throw into the discussion. In my opinion the Maynuo is 20 years back. No isolation from the rear panels, no specs about the maximum isolation voltages above ground, no interfaces more than RS232... unspecified slew-rates and overshot problems.

But you pay way less for a Maynuo, than a comparable "name" brand. So I'd say thats part for the cause. I got no issues with it. Can't expect everything for 275€ delivered. (Maynuo 9710 from a Chinese seller with German Stock).
http://rbastlerblog.jimdo.com/
Gamma spectrometer works. Now some yellow crystals need regenerating and testing.
 

Offline schopi68

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #84 on: November 02, 2017, 10:52:03 pm »
Hardware on the Maynuo is something i would not throw into the discussion. In my opinion the Maynuo is 20 years back. No isolation from the rear panels, no specs about the maximum isolation voltages above ground, no interfaces more than RS232... unspecified slew-rates and overshot problems.

But you pay way less for a Maynuo, than a comparable "name" brand. So I'd say thats part for the cause. I got no issues with it. Can't expect everything for 275€ delivered. (Maynuo 9710 from a Chinese seller with German Stock).
[/quote]

When buying in the chinese market the DL3021 has a list-price of 388€ - not such a big difference.

And if you are going to the Maynuo M98-Series you will pay much more. A M9812 will cost around 500€.
 

Online Wolfgang

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #85 on: November 09, 2017, 06:14:40 am »
Hi Dave,

I saw your review and it made me reconsider my idea to get one of those. I asked RIGOL about what they think about your findings and if there were any plans to fix some of them and what timeframe would be needed for that.
When I remember your review of the DP832A they reacted to your critique and redesigned and improved the instrument, so why not the same here ?

The reply by RIGOL was that they are not OK with your conclusions, and they wrote you a mail (not published).

My questions:
- will there be a follow-up on the issues described in your video ?
- Are there new facts I need to consider ?

Best regards
  Wolfgang
 

Offline schopi68

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #86 on: November 09, 2017, 09:29:25 pm »
Hmm... interesting to see (that the do react sometimes).
I made the youtube-video where i showed the oscillation of the DL3021A some time ago primarily to send it to the Rigol-Support. Up to now i did not even get a response from them about the situation shown there (what has been the main reason for me to publish this video some time later here to the public).
 

Offline Houseman

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #87 on: December 04, 2017, 09:41:46 am »
Hi folks.
I have read all your comments and are astonished how much once can learn from different points of view.
By the way a breaking question out from investigation.
Where can I find those beefy red and black cables (tagged I partially see BK precision) shown in minute: 28:30?
Any help would be very appreciated.
And thanks all.
My respect
Steve
 

Offline sebastos08

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #88 on: December 14, 2017, 07:30:17 am »
Hi all,
depending on this review, I decided to buy this item.
I currently own a oscillo, signal generator, DC power supply, dmm.. All in the brand Rigol.

I am globally very satisfied with their products, despite some software bug.
I must say that Dave's reviews weighed a lot in my decisions.

 and especially thanks to Dave's for his "riglol" utility ... about this, is Dave considering completing his great utility to crack access to the options ..?
 

Offline TT_ZX

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #89 on: December 14, 2017, 10:48:17 am »
Where can I find those beefy red and black cables (tagged I partially see BK precision) shown in minute: 28:30?
Any help would be very appreciated.
And thanks all.
My respect
Steve

Are these what you are looking for?
https://www.tequipment.net/BK/TLPWR1/Misc-Test-Leads/
 

Offline Houseman

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #90 on: December 16, 2017, 08:25:12 pm »
Yep!!!
They Are!
I could not find them on the net even searching for BK, the initials I was lurking from the video.. ;D ;D ;D
Thanks alot, Pal.

Regards
 

Offline Smokey

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #91 on: December 19, 2017, 02:42:54 pm »
ppppplease don't spend $75 USD on basic power hookup cables with fork terminals on the ends....  That would make me cry inside. 
If you have to... absolutely have to... I know some other cables that should be right up your alley....


http://www.audiolab.com/audioquest-diamond-hdmi-digital-audio-video-cable-with-ethernet/?utm_medium=googleshopping&utm_source=bc&attributes=eyIxMTM4MiI6Ijk3NTYifQ%3D%3D&gclid=EAIaIQobChMI0JqM3ZOV2AIVBrjACh2ZrA1-EAQYAiABEgIHffD_BwE
 

Online Mr. Scram

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #92 on: December 19, 2017, 02:45:31 pm »
60A HMDI cables would actually be pretty cool. Useless, yet cool.
 

Offline Decoman

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #93 on: December 19, 2017, 04:23:46 pm »
So in the video there can be seen a Rigol motto printed on the board inside the unit saying "Innovation or nothing". This reminds me of this technologist that showed up to testify in US congress re. internet/security in a hearing not too long ago, but as I remember it seemed to me like something deceptive when the conversation revolved around this nonsensical topic simply named "innovation". There was no explanation given as to what "innovation" would mean, and this more or less well known technologist in this regard ended up parroting the expressed sentiment of a public official on the other side of the panel in that congress hearing, both simply advocated so called "innovation" without explaining what that meant. As I remember it, none of the two at the hearing even bothered to discuss or elaborate on if the meaning of 'innovation' then could perchance come to mean less charming things like developing surveillance software or for espionage, or other similar types of products, and knowing how like businesses keep making new versions of a product to replace old ones for the purpose of selling something perceived as "new" onto a market, I can't help but think that "innovation" is a concept with unclear meaning at best.
« Last Edit: December 19, 2017, 04:45:30 pm by Decoman »
 

Offline sstepane

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #94 on: December 26, 2017, 06:42:39 am »
Hi,

Is any Dl3021 owner in here? I would like to ask what are update refresh options available for monitoring the current, for example?
Can't seem to find anything about it in manual. From video it looks like 1 update/sec, but that's quite slow. Are there any in-device or remote software options on that?
Thanks in advance!
 

Offline policeman0077

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #95 on: June 22, 2018, 03:28:13 am »
Any one knows whats the sampling rate when you use record function?
 

Online Wolfgang

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Re: EEVblog #1023 - Rigol DL3021 Electronic Load Teardown
« Reply #96 on: June 30, 2018, 09:17:16 pm »
Hi,

after the appropriate cooloff period of almost a year RIGOL seems to have fixed some issues found out by Dave. I tested one now for a week and it operformed without any quirks, so I bought a 200W A version and I like it so far.

The A version is a bit expensive but you can negotiate a bit so its OK in the end.

Best regards
   Wolfgang
 


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