EEVblog 1667 - Reverse Engineering the Brymen BM2257 Multimeter LowZ Mode

Reverse Engineering the Brymen BM2257 Multimeter front end to understand what changes have been made from the BM235 in the Low Z mode. DaveCAD time. Also some testing of the LowZ mode and how it works.

Forum: https://www.eevblog.com/forum/blog/eevblog-1667-reverse-engineering-the-brymen-bm2257-multimeter/ MOV datasheet: https://www.cnr.com.tw/cloudSpace/CNR_D.pdf How to reverse engineer: https://www.youtube.com/watch?v=lJVrTV_BeGg Multimeter Input Protection: https://www.youtube.com/watch?v=zUhnGp5vh60