Products > Test Equipment
New EEVblog BM786 Multimeter
ceut:
--- Quote from: EEVblog on June 03, 2021, 11:17:32 pm ---Brymen have never provided a calibration certificate :-//
Perhaps they can offer one as an optional service to the supplier, but that would cost more.
As for autorange, I think it's quite quick, so :-//
--- End quote ---
Hello,
It's strange because I have had one with my 257s from them, and the serial number is matching with the back of my meter
???
Also, based on your photos, maybe the washed-out screen is something linked to the HY2613C Contrast setting which we can't change (there is a 10K resistor 01C R104 on pin 4 of it which is described as "VLCD" on the datasheet).
But I will not modify my meter to check that :-\
For the auto-range: it is slower than my 2 others meters (257s and u1272a): I have seen that only when I checked the washed-out screen with all 3 meters in parallel, but I have no problem with that.
I think it is something with the 60.000 counts.
Edit: When I check a BM235 photo on this another great review
https://lygte-info.dk/review/DMMBrymen%20BM235%20UK.html
=>the pin 4 of the same HY2613C chip is tied to a capacitor, so switch to "VLCD Internal Charge Pump" as they talk about on the datasheet with a recommanded value of 1uF.
joeqsmith:
I checked the one I have and indeed the contrast is so poor I can't make it out.
Muttley Snickers:
I don't own this meter but was almost tempted after seeing the image below which was posted on the previous page of this thread, the display appears to be quite crisp in contrast. :-DMM
EEVblog:
--- Quote from: Muttley Snickers on June 04, 2021, 02:23:13 am ---I don't own this meter but was almost tempted after seeing the image below which was posted on the previous page of this thread, the display appears to be quite crisp in contrast. :-DMM
--- End quote ---
The contrast is good, but lighting and exposure makes a huge difference when doing comparisons.
BTW, I took this photo way back, not trying to show the LCD, just the sizes.
Cymaphore:
--- Quote from: ceut on June 03, 2021, 08:44:18 pm ---Is Brymen starting to fail? ??? :-\
--- End quote ---
I don't think so. First, by my personal impression, Brymen only recently got better with the displays. We've an old Beha-Amprobe Unitest Hexagon at the workplace, I'm certain it was built by Brymen. Horrible backlight, ok-ish LCD. Overall a good device.
Look at the amount of changes and innovations they do with every new product. With so many significant changes and improvements in relatively short time. They are not just building a box around some standard DMM-chipset with reference circuits, they are maintaining a line of ASICs. And at the same time a huge pressure in pricing and component part cost, no wonder they can't always get everything perfect.
Just look at the interior of that BM78x. You can really see that some engineers love what they are doing and trying to improve every spot available. With that amount of pressure, chances are higher that things go wrong or unexpected and you can't figure it all out before the things are boxed.
That kind of a gear with so much obvious engineering passion, functionality and quality in it and on it, for such a small price. I see no reason to be angry about imperfections or problems.
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