Products > Test Equipment
New EEVblog BM786 Multimeter
EEVblog:
--- Quote from: NoisyBoy on March 26, 2021, 06:45:08 pm ---Dave, I like the meter, perhaps one thing you could communicate back to the manufacturer is the ability to do field firmware upgrade would have provided a great differentiation that all buyers would love to have, and helps to reduce their warranty cost.
--- End quote ---
I've already did that when I first heard that it was possible with gthis new design (the BM235 and others use OTP parts). But they clearly don't want users upgrading the firmware. If you want an answer on why you'll have to ask them directly, I don't know.
Ultimately I (as a dealer) will have the ability to do firmware upgrades once I get the hardware to do so, but it's all under NDA I'm afraid.
EEVblog:
--- Quote from: bdunham7 on March 26, 2021, 11:25:05 pm ---
--- Quote from: IanB on March 26, 2021, 10:49:07 pm ---They can't provide an external USB port for safety reasons, and few people would be able to open up the case, connect to an internal programming header, and use a special programmer to burn the new firmware (at the risk of bricking the device if they got it wrong).
--- End quote ---
For some reason I thought this meter had PC-COM. But are the PC-COM equipped Brymen meters
flashable?
--- End quote ---
No they aren't. I believe the BM78x series is the first to use a re-programmable processor.
EEVblog:
--- 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.
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EEVblog:
--- 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.
ogdento:
I saw that Dave and some others checked various headers on the unit and got no data coming out, but I noticed that the lcd driver (HY2613C) has an i2c interface... are the sda/scl lines exposed on any pads/test points?
If so, maybe the data going to the lcd could be read?? (sortof how you can read the older brymens lcd data via the IR adapter)
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