I was the OP on the thread, feeling somewhat aggrieved by the switching behaviour at 2V of the SDM3045 even with a manual range setting. i.e. set it to 20V manual range, and measure a voltage of 1.5V everything is normal and the measurement appears on the screen quickly. Measure 2.5V and there is a pause, a click as a relay flips over and then eventually a reading appears.
Folk seem happy to resolve this by flashing firmware from a different model and they also seem happy with the results. I was not happy with that solution to the problem and I contacted Siglent through the normal channel some 6 months after purchase when I was particularly unhappy at some results I was getting using logging (another reason why having some kind of automatic range switch when in a manual range is absolutely barmy). I really shouldn't have left it so long and I was not expecting much of a response. To their credit, I had an answer very quickly from a senior figure in Siglent. Flashing different firmware was not a solution but Siglent could not have been more supportive.
I now have an SDM3055 which I should have purchased in the first place (they aren't much more cash than the 3045) and overall I am pleased with it.
I have read some criticism of Siglent by folk feeling let down by unresponsive Siglent support. I can only comment with any authority on my own experiences and for me Siglent support has been nothing but good, and I have been left feeling pleased to be a Siglent customer both for this meter and for some other kit that I also have. Although not involvd with my particular case I also would commend the enthusiasm of our friend Tautech for his support, not just to his own Siglent customers but to folk all over the world through this forum and privately in the background. Well done !
Eloso