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:
Podcast: Download
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