Author Topic: Siglent SDM30xx and Rigol DM30xx share some guts?  (Read 1918 times)

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Offline eevaccTopic starter

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Siglent SDM30xx and Rigol DM30xx share some guts?
« on: September 28, 2023, 08:41:55 pm »
Hi!

I'm making a "chinese corner" inside my serious lab just for FUN (and stupidity) and am currently choosing between the DMMs Siglent SDM3055 and Rigol DM3058E.
A quick look into the spec sheets revealed the exact same accuracy data (see pictures attached). Also many other wordings in those spec sheets are exactly the same (example "NMRR: 20 dB are added if open the AC filter").

This made me think for a moment. It's not random, obviously these are based on some common platform, either Siglent buys it from Rigol or vice versa, or they both buy it from someone else.
Looking at the guts of SDM3055 and DM3068 (see pictures attached, couldn't find those of DM3058), clearly there are many similarities.

I haven't found any information on this, does anyone have an insight?

I don't want to throw money around, just some OK precision for the best price possible. Unfortunately I prefer the Siglent (bigger display, better toy!!) which currently costs about 85 Euro more.
The SDM3045X ist just a bit too inaccurate, for about 20% (80 Euro) more I can get the DM3058E already which has 0.015% DCV accuracy instead of 0.06%, quite a big difference (even a toy has to have some accuracy, otherwise I will make it explode somehow!).
The additional 85 Euro on top would be just for the nicer display of the Siglent. Is it worth it...? Thinking.

Thanks!
 

Offline KungFuJosh

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Re: Siglent SDM30xx and Rigol DM30xx share some guts?
« Reply #1 on: September 28, 2023, 10:08:59 pm »
I have both the SDM3045X, and SDM3055. My SDM3045X is upgraded to the SDM3055X-E (China market model, same hardware as 3045X, but 5.5 digits).

You can see a comparison I made in the 3045X improvement thread: https://www.eevblog.com/forum/testgear/sdm3045x-to-sdm3055x-e-improvement-thread/msg5075287/#msg5075287

Both meters are great, and my X-E version is more stable as it's had more break-in time.
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Offline Njk

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Re: Siglent SDM30xx and Rigol DM30xx share some guts?
« Reply #2 on: September 28, 2023, 10:58:11 pm »
Which DMM is less susceptible to internal rust development? Early here were a complains about rusty chassis in some Siglent instruments. That suggests that the chassis is made of bare steel sheet, with little or no electrochemical plating. Is that still true? Hard to find out on the internet images.
 

Offline tautech

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Re: Siglent SDM30xx and Rigol DM30xx share some guts?
« Reply #3 on: September 28, 2023, 11:00:57 pm »
Which DMM is less susceptible to internal rust development? Early here were a complains about rusty chassis in some Siglent instruments. That suggests that the chassis is made of bare steel sheet, with little or no electrochemical plating. Is that still true? Hard to find out on the internet images.
No.
Rust issues long ago arose from chassis suppliers using poorly coated sheet stock.
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Some stuff seen @ Siglent HQ cannot be shared.
 
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Online Doctorandus_P

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Re: Siglent SDM30xx and Rigol DM30xx share some guts?
« Reply #4 on: September 29, 2023, 12:36:55 am »
Dave used to complain a lot about the "siglent rust". And all I ever saw on his video's were very tiny specks of rust on the sides of cut steel sheet. And those sheets are plated before being cut, so there is no zinc plating on the cuts at all. I find it hard to believe there ever was any serious issue with rust in Siglent equipment.
 
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Offline thm_w

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Re: Siglent SDM30xx and Rigol DM30xx share some guts?
« Reply #5 on: September 29, 2023, 12:45:26 am »
I don't know about the release dates, I think both SDM3055 and DM3068 were around 2011 time frame?
There was also the Rigol DM3064 which predates the DM3068, ~2009. Probably internally very similar.

Its not unusual to see specs copied from other manufacturers. The baseline has been set, they know it can be done at a certain pricepoint, so the spec is their goal to create a competing unit. My guess here is a Siglent engineer bought the competitions unit and did their own design, heavily inspired. I'm sure the rigol unit was inspired as well, though I don't know from what. Don't really care either way TBH.

Dave used to complain a lot about the "siglent rust". And all I ever saw on his video's were very tiny specks of rust on the sides of cut steel sheet. And those sheets are plated before being cut, so there is no zinc plating on the cuts at all. I find it hard to believe there ever was any serious issue with rust in Siglent equipment.

Its more of an ongoing joke if anything. How they responded did not help.
The concern IMO, was that the rust happened AFTER assembly, so could affect components as well. But once it is confirmed to be pre-existing rust it is basically a non-issue.
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Offline tautech

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Re: Siglent SDM30xx and Rigol DM30xx share some guts?
« Reply #6 on: September 29, 2023, 12:52:31 am »
I don't know about the release dates, I think both SDM3055 and DM3068 were around 2011 time frame?
3055 release was late 2014 or early 2015.
I started the SDM3055 thread September 19, 2014 and later added SDM3045X & 3065X (2016 & 2017) into the same thread.
https://www.eevblog.com/forum/testgear/siglent-new-bench-dmm-sdm3055/
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Offline Njk

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Re: Siglent SDM30xx and Rigol DM30xx share some guts?
« Reply #7 on: September 29, 2023, 01:15:39 pm »
Dave used to complain a lot about the "siglent rust". And all I ever saw on his video's were very tiny specks of rust on the sides of cut steel sheet. And those sheets are plated before being cut, so there is no zinc plating on the cuts at all. I find it hard to believe there ever was any serious issue with rust in Siglent equipment.
I was a frequent visitor to the scrap bins at manufacturing plants. It's a free source of many interesting materials which are virtually impossible to obtain in any other way. So I know what happens to a properly plated steel parts after a months in open air. The rust does not start until the plating in that area completely turned to a whitish substance.This is something different. The very purpose of plating is to prevent corrosion, not to provoke it. Fake plating just should not be there because rust is a thing which is very difficult to remove. Similar to a stain on the reputation.
 

Offline klausES

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Re: Siglent SDM30xx and Rigol DM30xx share some guts?
« Reply #8 on: October 01, 2023, 01:55:33 pm »
The cut edge grate and the rust stains should have been history long ago.
My Siglent devices are no longer completely new, but none of them had the problem. So it has to be several years ago.

For long -term, it always depends on the factors such as air humidity in the rooms, where a device spends its life.
Even in an apparently dry room on the ground or near a damp wall, it can rust more than freely on a closet or table.
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Offline shakalnokturn

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Re: Siglent SDM30xx and Rigol DM30xx share some guts?
« Reply #9 on: October 11, 2023, 05:10:15 pm »
To moderators:

How did memeber "eevacc" get banned in just one post?
I'm assuming it's for private messages as I've received a recent request for help from him, I don't know if it's legitimate or if there's a catch, anyway I can't answer him due to the ban.
I'd be interested to know if there was a complaint of someone actually being ripped-off by him leading to the ban?
« Last Edit: October 11, 2023, 05:13:23 pm by shakalnokturn »
 

Offline KungFuJosh

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Re: Siglent SDM30xx and Rigol DM30xx share some guts?
« Reply #10 on: October 11, 2023, 06:50:56 pm »
To moderators:

How did memeber "eevacc" get banned in just one post?
I'm assuming it's for private messages as I've received a recent request for help from him, I don't know if it's legitimate or if there's a catch, anyway I can't answer him due to the ban.
I'd be interested to know if there was a complaint of someone actually being ripped-off by him leading to the ban?

I'm not a mod, but he doesn't appear banned to me?: https://www.eevblog.com/forum/profile/?u=965881
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Offline thm_w

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Re: Siglent SDM30xx and Rigol DM30xx share some guts?
« Reply #11 on: October 11, 2023, 11:07:10 pm »
I'm not a mod, but he doesn't appear banned to me?: https://www.eevblog.com/forum/profile/?u=965881

Look at the image under their name, its the banned image 
Could be the troll who keeps trying to come back.
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Offline KungFuJosh

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Re: Siglent SDM30xx and Rigol DM30xx share some guts?
« Reply #12 on: October 12, 2023, 12:15:48 am »
Look at the image under their name, its the banned image 
Could be the troll who keeps trying to come back.

Oh, weird. For him to be "the troll" he must be pretty bad. There's a few trolls around here. 😉
"Right now I’m having amnesia and déjà vu at the same time. I think I’ve forgotten this before." - Steven Wright
 
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