Not sure if this is the right place to post this but I thought although I didn't design it it's a project nonetheless for a novice hobbyist like myself
Inspired by another discussion about milliohm meters a few weeks ago, I went searching for one and found a Chinese designed DIY kit. Seeing that it's all 0805 and 0603 SMD components and quite a few IC's with small pin pitches I was initially a bit hesitant (as I failed miserably before with another DIY kit with a MCU in a LQFP package) but thought I would give it a go anyway.
The soldering job is a bit rubbish but at least this time no chips get killed and it works!
Besides the PCB and components the kit also comes with a lot of documentation (in Chinese), a pair of Kelvin clips and leads, an acrylic case, a lithium rechargeable battery, a programmer (for uploading the firmware), and even the source code of the firmware.
I took the attached pictures before I attempted to calibrate it but I was already quite impressed with its resolution and stability in the readings. It has 2 ohm ranges (0.2 and 20) and in the 0.2 ohm range it offers resolution all the way down to 1 micro ohm!
I have since done some not-so-precise calibration with the gear I have and compared the results against the HP3457A and this little device is tracking very well with the HP across the ranges. I will post more pictures in this thread later on as I'm trying to order some resistance standards for calibration.
The device also doubles as a 5.5 digit volt meter by changing some jumpers on the back side and I have played around with that a little bit today. Initial impression is that it has great accuracy but seems to drift a bit over time. I will also update on that later.