New Siglent SDM4000A series Multimeter

[Furna]

Try the attached and let me know how it goes. I made 3 different versions.

It is working since 20 minutes without a glitch.
I am currently measuring the AC mains (togheter with BM2257).
I know; boring and not th ebest use of a 6.5 digit multimeter anyway the first and fastest thing to measure I had at hand ...
I'll switch to something else in an hour or two.

Completely unrelated to TestController: I found the network interface unresponsiveness even to a simple ping after I was playing with it for a while.
I power cycled the device to have the network working again ... currently no idea how to reproduce it.

[KungFuJosh]

If that glitch happens again, try hitting the shift key (assuming it works the same way as the others) to switch to Local control again before reattempting remote control.

[KungFuJosh]

I think the attached file is the one that worked for Martin. @Martin72, have you modified the file at all? Or is it running fine as is?

Thanks,
Josh

[Furna]

If that glitch happens again, try hitting the shift key (assuming it works the same way as the others) to switch to Local control again before reattempting remote control.

Local control was working perfectly ... it was just the network not working.
I played with EasyDMM-X - no issue
Switched back to Local and took a few measurment - no issue
I played with the Web interface - no issue
Switched back to Local and took a few more measurement and played around a few menu - no issue
I tried to connect with TC ... no connection but Local was working ...
Tried to ping -> no reply
Then I power cycled.

Let's see; I'll pay some attention ...

[Martin72]

Hi @Josh,

I hadn't changed anything.

[KungFuJosh]

Local control was working perfectly ... it was just the network not working.
I played with EasyDMM-X - no issue
Switched back to Local and took a few measurment - no issue
I played with the Web interface - no issue
Switched back to Local and took a few more measurement and played around a few menu - no issue
I tried to connect with TC ... no connection but Local was working ...
Tried to ping -> no reply
Then I power cycled.

Let's see; I'll pay some attention ...

If it happens again, and pinging doesn't work, try something else like *IDN? or *CLR or *RST and see if that does anything for you.

[Furna]

Local control was working perfectly ... it was just the network not working.
I played with EasyDMM-X - no issue
Switched back to Local and took a few measurment - no issue
I played with the Web interface - no issue
Switched back to Local and took a few more measurement and played around a few menu - no issue
I tried to connect with TC ... no connection but Local was working ...
Tried to ping -> no reply
Then I power cycled.

Let's see; I'll pay some attention ...

If it happens again, and pinging doesn't work, try something else like *IDN? or *CLR or *RST and see if that does anything for you.

Found how to reproduce 

Software ver: 0.0.0.18
Start condition: fresh new configuration, dhcp.
Action to reproduce: set screensaver (I used 15 min). Immediately after (or few minutes later) Menu->Utility->Store/Recall->RestoreFactory/OK
Symptom: network becomes unavailable. Device does not respond to ARP.
Recovery: perform a second "RestoreFactory" or "Lan OFF/ON" or "LXI reset"

The behaviour is not consistent ... every few RestoreFacotry it happens also without setting ScreenSaver ...
Anyway not a big issue

[Furna]

Some spelling errors in manual that needs fixing
Binning Munual (on DMM display, p122)
Menu > Help > Teach support (in manual, p29, p126)

Ehm ... it's not only a matter of spelling ...



 

[Martin72]

It can happen.
Furna, were you able to establish a successful connection with TC?

[Furna]

It can happen.
Furna, were you able to establish a successful connection with TC?

[bdunham7]

Also the 34401 has not low impedance link. It just wants a reasonable low impedance (like < 10 K) external link, so that the switching spike can be absorbed.

I'll reply to that when I return home in 2 weeks.  The two LO terminals don't have a simple low-resistance connection, there are semiconductors or something involved.  However, IIRC, if you put any significant voltage there, like 10V, I you'll get a large current.  The maximum lead resistances for 4W ohms are <<<10k, and for ratio measurements anything less than a complete dead short will produce some error.  But I don't have one available so I'll have a closer look when I do.

You have an interesting theory on the Siglent design, the only suggestion I have is my previous request for someone to measure that impedance using a DMM with fairly high (10V?) compliance voltage. 

[Kleinstein]

The maximum voltage at sense Lo for 4 Wire resistance is likely in the lower range, that use gain for the main amplifier. The limitation would be not so much the voltage at sense low, but the range for sense Hi is limited (some 120 mV) and if a significant part is lost at sense lo there is not much range left.
For protection the sense input have some 24 K of series resistance.

[mawyatt]

Any tear-downs of these?

Curious about the internal Thermal/PCB design, type Reference and ADC utilized.

Best

[tautech]

Any tear-downs of these?

Curious about the internal Thermal/PCB design, type Reference and ADC utilized.

Best

See reply #130 Mike.
Tony gave us a few pics:
https://www.eevblog.com/forum/testgear/new-siglent-multimeter/msg5900438/#msg5900438

[tonyalbus]

Does anyone know the password for user calibration for the SDM4065, weird it does have a password
i want to play with this a bit,, when all goes wrong i set it back to factory.

Rob maybe? @tautech

[tautech]

Does anyone know the password for user calibration for the SDM4065, weird it does have a password
i want to play with this a bit,, when all goes wrong i set it back to factory.

Rob maybe? @tautech

No idea, actually never had one across my desk but first suspect would be the PW to get into the DSO Developers options. 

[Martin72]

No, it's not.

[Furna]

I was also going to play with user calibration a bit today ... DMM Check Plus r8 just arrived this morning.

[2N3055]

I was also going to play with user calibration a bit today ... DMM Check Plus r8 just arrived this morning.

DMM Check plus after travel to you is not good enough to serve as reference to adjust SDM4000.
I would only make a calibration ( defined as measuring up all the test points, 10 times in a row, and writing down detailed results)
And do that every month.

At one point measurements will settle and become very stable.
You will never know if changes were because of DMMCheck or meter.

Until an independent high quality calibration on both is performed and then you will know.

[Furna]

No, it's not.

I hit exactly the very same wall ... moreover the device freezes and I need to power cycle with the button.

[Furna]

I was also going to play with user calibration a bit today ... DMM Check Plus r8 just arrived this morning.

DMM Check plus after travel to you is not good enough to serve as reference to adjust SDM4000.
I would only make a calibration ( defined as measuring up all the test points, 10 times in a row, and writing down detailed results)
And do that every month.

At one point measurements will settle and become very stable.
You will never know if changes were because of DMMCheck or meter.

Until an independent high quality calibration on both is performed and then you will know.

Thank you, I am aware of DMM Check plus limitations ...
Since a user calibration does exists on my SDM4065A (I can switch between user calib and factory calib) and since the user calibration is far away from the reference 5V I was going to play with it ... but hit the password wall (and subsequent freeze of the device).

IMHO something definitely worth to singal to Siglent.

Going back to calibration ... the idea is to wait a few months (I would say beginning of January 2026) and send both device for calibration (for the DMM adjustment included).
Enough time for stabilization.
The plan is easy to realize if I do not relocate to Italy before that date ...

BTW anyone knows a good lab that offers services to non commercial entities in Italy?


EDIT: I just learned that DMM has a trim pot so will ask the lab if they can adjust the DMM check plus too.

[tonyalbus]

Thanks Rob anyway you always respond very fast!  @tautech
indeed thats not it.
tried also with the date 2025.06.21 for today and chatgpt thought it was 112112
so i send now a support ticket to siglenteu, i wanted the original calibration report also.
when i know, you know

[tonyalbus]

i just want to play with is, and use my WRYtech PDVS2mini and my DMM6500 and the GDM6091 , they all agree.
and for other ranges i can use my old Fluke 5101B with the two Keithley/GW-Intek

[Furna]

Tony, did you also got the freeze of the device after inserting a wrong password?
Thank you

[tonyalbus]

Tony, did you also got the freeze of the device after inserting a wrong password?
Thank you

The first few times not (i think, i did not notice in my memory) , but after 2 time yes
also the [wrong password] window is sometime behind the soft-key-board,
after [enter] it just shows still the keyboard, until you click [close] and than the [wrong password] window appeared
and a power cycle is needed also with mine