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Hacking the Siglent SDM3055 Bench DMM

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Bill3745:
Hello Alexia,
I have been following your work on reverse engineering the hardware and redesigning the firmware/software of the SDM3055 and congratulate you on how far you have come and what you have been able to accomplish without any hardware modifications to this fairly low end benchtop DMM.  Per your comment regarding powerline outage distortions, do you know if the Keysight uses a linear or switching power supply? Since it costs around 10x the Siglent, I guess we shouldn't expect the same level of performance  :D

Thank you for your continued work on this and I would be willing to sign up as a beta tester when you are ready to enter that phase of development.

--Bill

Kleinstein:
Most of the bench meters use a classical transformer - ideally a custom one with extra shields and isolation.  A few than use a switched mode regulator for the supply of the computer part - though less so with the more modern ones as the power needs have come down.
The point to get better tolerance to missing mains periods would be larger filter capacitors or more voltage reserve (and thus more heat).  A larger/additional filter capacitor may be an easy change if really needed. For a reboot chances are this would only be for the logic / µC parts not for the analog part.

A bench meter is normally used with a more well behaved supply in a lab environment, not so much in an more problematic indistrial environment. Still the normal switch over from an UPS should ideally be tolerated.
A better tolerance to supply glitches would still be nice, when using it for automated longer time data logging or experiments. I would not complain much about a distorted measurement as a short time effect - chances are other instruments and the signal source would also no behave than well. So one would likely have a glitch in the data anyway.

alexvg:
I felt like thinking about something else... with a bit of painting and good weather!



https://twitter.com/AlexiaGossa/status/1662904304099893249

I will answer your questions within a few hours or a few days.
Thanks for your support.

Alexia from France.

alexvg:
Hello,

The Keysight 34470 uses a "conventional" transformer, just like the Siglent. However, the power supply of the Siglent is undersized for voltage stability variations.

View of the transformer of the Keysight 34470:
https://www.flickr.com/photos/eevblog/16605656689/

View of the Siglent SDM3055:
https://www.eevblog.com/forum/testgear/siglent-sdm3055-first-impressions/msg541312/#msg541312


And I did a bit of painting today...



Have a nice painting day !  ;)

Alexia from France.

bobxxlua:

Hello, where can I download your latest updates? I can be your beta tester. Thanks for your work

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