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| New EEVblog BM786 Multimeter |
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| AVGresponding:
--- Quote from: EEVblog on April 19, 2021, 01:17:30 am --- --- Quote from: EEVblog on March 28, 2021, 10:43:34 am --- --- Quote from: Kleinstein on March 27, 2021, 06:36:02 am ---If really wanted a suitable place for a connector to allow a SW update would be in the battery compartment. --- End quote --- That's where it is on the BM786. Or at least that's what I assume it is they haven't given me the programmer hardware or instructions yet. But there is a mystery header in the battery compartment. --- End quote --- Mystery battery compartment header confirmed as the programming port (obviously). I am also now in possesion of the programmer so am able to update stock on hand if a firmware update comes out. Have not tried it yet though. Please do not ask for any details, I am not able to reveal any info about it. --- End quote --- I am curious about the position on non-updated meters already existing in the wild. Do you anticipate some sort of shipping-them-there-and-back program to update them, or would that be logistically impossible? |
| ogdento:
Thanks Dave, I can see the SCL/SDA lines going from driver pins 9/10 to the R210/R211 (1k?) resistors on the board bottom. Not sure if those are pullups, but I can't see where they go after. I guess it would be interesting to play around with, but may be silly to hack in a data-output port. |
| rsjsouza:
--- Quote from: EEVblog on April 19, 2021, 01:17:30 am ---Mystery battery compartment header confirmed as the programming port (obviously). I am also now in possesion of the programmer so am able to update stock on hand if a firmware update comes out. Have not tried it yet though. --- End quote --- Aha! I called it! ;D (minus the blown JTAG fuse) --- Quote from: EEVblog on March 28, 2021, 10:40:31 am --- --- Quote from: rsjsouza on March 27, 2021, 01:34:35 am ---I doubt Brymen is using OTP, but instead Flash with a burned JTAG fuse to prevent any access. --- End quote --- Maybe, but I have been told the BM235 is OTP. And given that during development they were wondering if they could fit a couple of extra features I wanted in the IIRC hundred bytes or something they had left in the memory, I'm fairly confident it's one of those little known smal memory OTP processors. --- End quote --- |
| EEVblog:
--- Quote from: AVGresponding on April 19, 2021, 05:32:37 pm ---I am curious about the position on non-updated meters already existing in the wild. Do you anticipate some sort of shipping-them-there-and-back program to update them, or would that be logistically impossible? --- End quote --- Logistically and financially not viable. Consider the BM78x series the same as all other Brymen meters, non-upgradable. |
| jayjr1105:
After regrettably selling my BM235, I bit the bullet on this meter. Yes it's probably overkill for my hobby needs but I was sick of chasing the unicorn $50-100 "perfect" dmm. BTW, is there no official eevblog video on this meter yet? Would have been nice to see a thorough review of it even if it's your own product. |
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