| Products > Test Equipment |
| Hacking the Siglent SDM3055 Bench DMM |
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| Mr. Scram:
--- Quote from: coromonadalix on August 21, 2019, 10:39:04 am ---Is it me or its going in the wrong direction ? even if he provide his code, where the code base came from ? Siglent no/yes ? --- End quote --- Apparently not. Writing your own code completely from scratch is legal. Patching existing firmware with your own code also tends to be legal as you don't copy or provide someone else's code. |
| JohnG:
This is really nice work, and the related discussion interesting as well. But, there is a practical matter. A modified meter will have no warranty and reduced odds of support. Have you checked the prices of used 34401 meters lately? Not as many modern features as the 3055A, but they use a LM399 reference and do 6.5 digits without mods. The reference has a good chance of being aged and stable. I have both meters. The 3055A is easier to use, for sure, but not much of a track record regarding accuracy. A modified version, even less so. Just my $0.02. John |
| alexvg:
--- Quote from: coromonadalix on August 21, 2019, 10:39:04 am ---Is it me or its going in the wrong direction ? even if he provide his code, where the code base came from ? Siglent no/yes ? --- End quote --- The SDM3055 is based on Linux operating system with only a binary file written (partially) by Siglent launched during startup. Used internal libraries and all external libraries come from Texas Instrument, Linux system... --- Quote from: maginnovision on August 20, 2019, 11:35:55 pm ---As far as I can see the 3055 is not old, it's a current product. --- End quote --- It's an old device from 2014... Lots of units have been sold : maybe some people would be interested in updating or improving their device without buying a new more powerful and perhaps more expensive DMM. |
| NoisyBoy:
Since you are trying to build something to sell, I doubt this is an appropriate discussion for this forum especially when you try to do a product interest survey. The 3055 is not designed as an open hardware platform for open source firmware development. I will never pay for “enhanced” firmware that does not come from the manufacturer, it is a sure way to void the warranty plus I will never trust the reading. I am not saying it is a bad idea, just that it is more appropriate to be discussed in another venue. |
| alexvg:
Thank you for this very interesting and informative discussion. About software, I'm continuing working on the new firmware : - I've successfully access to the display and keyboard. - I'm waiting for the Lattice USB programmer. - I'm currently investigate the protocol between digital and analog boards. About hardware, I've received the components to build a pre-regulated power supply. I'm waiting for the LTC6655BHLS8-2.5 voltage reference. I'll try one chip to measure ADC noise. I'd like to build a 6-chip voltage reference : 6x LTC6655 in parallel to limit noise and deviation. I'm waiting for a brand new calibrated voltage reference (based on the LM399AH). I'm always searching for a calibrated LTZ1000ACH voltage reference module, I could not find it. Any ideas ? |
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