Products > Test Equipment
EEVBlog 121GW Multimeter Firmware Details
lowimpedance:
--- Quote from: joeqsmith on November 26, 2018, 04:22:01 am ---If you have a way to take some high resolution pictures of the switch contacts, it would be interesting to see how they are wearing.
--- End quote ---
I actually had an occasion to have the switch out and not having any means to take a high res pic. I tried to get the best with the crummy camera I had to hand. See image attached.
Looking as close as I could with a magnifying glass I cannot see any notable wear on my meter. But then again it has not reached 50000 rotations :D.
nonentity:
I'm wondering if the administrator has considered combining some of these threads with the issues section. It started out with discussions about firmware metadata, but looks like it has morphed into issues.
Topics I would expect to see in firmware details discussions would be:
Design Requirements, i.e., what things is it supposed to do and will those things be tested?
Configuration Management/Control, i.e., what really is in V 1.57 and what should go into 1.58 and why?
Test methods and results, i.e., how is it going to be tested? Was it tested? And where are the reports?
Documentation
Quality Control
lowimpedance:
@Joe
I used the Mantis at work to inspect the switch pattern and I could not determine if the black material was metallic in nature , quite possible there is some.
The reason is after a good clean I could see (using a 10X mag. eye loupe) that there was notable wear on some of the dimples on the switch fingers in the rotor.
Ie: the dimples that were a bit higher and thus had more pressure on them had worn down through the gold plate to the copper underneath. And this could well be the source of the black material on the PCB.
The PCB switch pattern however looked perfectly fine with minimal wear after cleaning.
I will try to get hold of a USB microscope to take some pictures (Monday!).
CDaniel:
My meter 180701918 from Welectron
Terry01:
I got mine around a week ago from Welectron too but it's only been used a few times since so the contacts will still probably be "as new" so hardly worth showing just yet. I'll wait till I've had it for 6 months or so then i'll open it up and post a few photos.
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