I purchased and successfully assembled the 138 kit (no smd soldered).
It's very fun to use and has been much more useful so far than the usual multimeter (as a voltmeter of course)
By the way, i hope i didn't purchase a counterfeit kit, as the solder pads don't seem to be as indicated in the comparison image, but
- Silkscreen was perfect
- Nice smooth edges on the board
- Documentation was printed with good quality paper/definition
- Software version is the latest -050 (where the latest publicly available is -040)
However, i'm having a little problem with the trigger: it doesn't trigger, at all. sometimes with certain frequencies in certain timebases i have a kind of still image but it's still not the correct behaviour.
I've already located the circuit part on the schematic but i don't know exactly what voltages i should expect. can i have some pointers there?
Issue number two (but maybe it's not an issue): as noticed by other users in another topic, there seem to be some moving noise floor, like a periodic waveform... a stepped ramp. since it's not depending on sensitivity i assume it's an "error" or something generated by the ADC or even inside the code. is there a way to reduce/remove it?
Then to the infos: There are three serial ports. the SWD, to reprogram the chip a USB and the UART. i was wondering, what's the point of those?
Thank you, and thank you for the amazing project
