From Dave's pics:
Fluke28x REV 015
U26 - MC9328MXSCVP10, i.MX ARM920T, 100MHz, LCD controller, 2 32-bit timers (oh so many lol), RTC, USB etc. MAPBGA-225 discontinued 01-2021.
U28 - 640P30TF65 64Mb as 4MBx16 NOR FLASH BGA-64
U25, U27 - IS66WVC2M16ALL, PSRAM 32Mb as 2MBx16, 70ns VFBGA-54 DRAM
It does look like overkill ARM9 even if the LCD is super high res - ultimately the multimeter is reading only one or two quantities, what would a Cray do with all that?
I think the added costs - 8 layer board, BGA mix with all that the through-hole, big CPU and memory might have caused the product to be expensive?
I got burned once in a product design using that "mobile/cellphone" PSRAM as it has a very low power self-refresh mode - but they all got obsoleted by Micron and the Fluke shows an Intel part and we all know how their venture into mobile went...
The memory IC going obsolete, it scuttled my whole project. I would guess that necessitated Fluke board rev. but not sure what they went with or if power drain increased. Assuming the supercap only holds the RTC, not data logs.
[...] Dave, please taunt Brymen to up their rotary switch tech instead of this "good enough" philosophy
What's their problem?
Didn't they perform fairly well in Jow Smiths switch testing?
It's single point, high contact pressure and seems to be finicky about production tolerances. Not sure what the outcome was in this thread
BM786 Switch Issue.