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| EEVBlog 121GW Multimeter Firmware Details |
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| gnavigator1007:
--- Quote from: Terry01 on December 02, 2018, 08:42:20 pm ---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. --- End quote --- Might be worth it to open it now and grab some pics to compare down the road. Obviously, should still look new with no wear, but you don't really know without a peek. |
| Terry01:
--- Quote from: gnavigator1007 on December 02, 2018, 09:33:41 pm --- --- Quote from: Terry01 on December 02, 2018, 08:42:20 pm ---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. --- End quote --- Might be worth it to open it now and grab some pics to compare down the road. Obviously, should still look new with no wear, but you don't really know without a peek. --- End quote --- Very true, I never thought of it like that. I'll open it up when I get up in the morning and post a couple of the pics I take. |
| CDaniel:
--- Quote from: joeqsmith on December 02, 2018, 10:55:12 pm --- --- Quote from: CDaniel on December 02, 2018, 08:19:26 pm ---My meter 180701918 from Welectron --- End quote --- So they went from all single dimples to double dimples and now they are back to single dimples?? It looks like the dimples are showing some wear on yours as well as the pads. Are we starting to see some copper exposed on the pads? --- End quote --- That is "black dirt " , after a wipe with alcohol looks like new , no sign of wear on pads . But I didn't work with it much , as we know has "some" bugs and I don't like this ... I'm more worried about this issues ... I would like to see a comparation with other multimeters using HY3131 , Keysight U1282A for example ... |
| Terry01:
--- Quote from: CDaniel on December 03, 2018, 12:44:18 am --- --- Quote from: joeqsmith on December 02, 2018, 10:55:12 pm --- --- Quote from: CDaniel on December 02, 2018, 08:19:26 pm ---My meter 180701918 from Welectron --- End quote --- So they went from all single dimples to double dimples and now they are back to single dimples?? It looks like the dimples are showing some wear on yours as well as the pads. Are we starting to see some copper exposed on the pads? --- End quote --- That is "black dirt " , after a wipe with alcohol looks like new , no sign of wear on pads . But I didn't work with it much , as we know has "some" bugs and I don't like this ... I'm more worried about this issues ... I would like to see a comparation with other multimeters using HY3131 , Keysight U1282A for example ... --- End quote --- I have Keysight U1273A...does that have HY3131? |
| lowimpedance:
I have taken some pictures of my 121 ontacts using a USB microscope and attached for your ref. note its quite hard with the gear I had to hand to get the best contrast, so may not be the absolute best representation. The wear appears to be uniform across most of the dimples. The cotton tip I used for cleaning only shows the 'black stuff' and no discernible metallic debris. The PCB traces look good with no obvious 'wear track' forming. |
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