Author Topic: EEVblog 121GW Multimeter Issues  (Read 530101 times)

0 Members and 2 Guests are viewing this topic.

Offline crispus

  • Regular Contributor
  • *
  • Posts: 126
  • Country: ro
Re: EEVblog 121GW Multimeter Issues
« Reply #1350 on: May 27, 2021, 12:39:41 pm »
I'd also be happy to settle for an affordable PCB replacement, if that would be an option. Anything really since now I've just got a very expensive paper weight.
I would be interested in this option too since my most expensive multimeter is useless. I asked about this option in this thread couple months ago but no response so far...
Is there a board replacement available? That would give me peace of mind...

I know I'm numskull, but I look around me and I feel better.
 

Offline jancumps

  • Supporter
  • ****
  • Posts: 1257
  • Country: be
  • New Low
Re: EEVblog 121GW Multimeter Issues
« Reply #1351 on: May 27, 2021, 01:07:48 pm »
I've tried to make a bit more targeted photos of my meter (SN 180701835 that is behaving well).

I can see some damage on that PTC and the shrink around it.

(the DMM case side is not damaged. What looks like damage is shadow of the component)




« Last Edit: May 27, 2021, 01:15:35 pm by jancumps »
 
The following users thanked this post: Andrew McNamara

Online J-R

  • Regular Contributor
  • *
  • Posts: 195
  • Country: us
Re: EEVblog 121GW Multimeter Issues
« Reply #1352 on: May 28, 2021, 12:26:17 am »
I've tried to make a bit more targeted photos of my meter (SN 180701835 that is behaving well).

I can see some damage on that PTC and the shrink around it.

(the DMM case side is not damaged. What looks like damage is shadow of the component)

Not sure if you're asking for info or just pointing this out, but of course future readers should push the metal shield tight against the side of the bottom case before re-assembly to avoid damaging the PTC.
 

Offline EEVblog

  • Administrator
  • *****
  • Posts: 33122
  • Country: au
    • EEVblog
Re: EEVblog 121GW Multimeter Issues
« Reply #1353 on: May 28, 2021, 12:43:25 am »
FYI, I have asked KaneTest for comment.
 

Offline EEVblog

  • Administrator
  • *****
  • Posts: 33122
  • Country: au
    • EEVblog
Re: EEVblog 121GW Multimeter Issues
« Reply #1354 on: May 28, 2021, 02:07:25 am »
FYI, I have asked KaneTest for comment.

They have come back and said they can't see how it could have survived the factory calibrator HV test if it was a manufacturing error. But they have agreed to replace it. So email me your courier details.
 
The following users thanked this post: PA0PBZ, Brumby, vyruz, Andrew McNamara, AVGresponding

Offline jancumps

  • Supporter
  • ****
  • Posts: 1257
  • Country: be
  • New Low
Re: EEVblog 121GW Multimeter Issues
« Reply #1355 on: May 28, 2021, 10:11:10 am »
I've tried to make a bit more targeted photos of my meter (SN 180701835 that is behaving well).

I can see some damage on that PTC and the shrink around it.

(the DMM case side is not damaged. What looks like damage is shadow of the component)

Not sure if you're asking for info or just pointing this out, but of course future readers should push the metal shield tight against the side of the bottom case before re-assembly to avoid damaging the PTC.
I wasn't asking. Just showing how the PTC area and shield looks like in my meter. It may help in the analysis.
 


Offline Archon

  • Newbie
  • Posts: 1
  • Country: us
Re: EEVblog 121GW Multimeter Issues
« Reply #1357 on: June 04, 2021, 06:23:38 pm »
Hi, new user here. Is this the right place to ask if the above issue was related to manufacturing during the kickstarter? Did it result in a fix of some sort? If I were to order a 121GW right now, can I have confidence it won't have such an issue?
 

Offline HKJ

  • Super Contributor
  • ***
  • Posts: 1941
  • Country: dk
    • Tests
Re: EEVblog 121GW Multimeter Issues
« Reply #1358 on: June 04, 2021, 06:47:43 pm »
Hi, new user here. Is this the right place to ask if the above issue was related to manufacturing during the kickstarter? Did it result in a fix of some sort? If I were to order a 121GW right now, can I have confidence it won't have such an issue?

As far as I know the only real issue was with the rotary switch and it was fixed in a couple of months.
Over time there have been some software issues, but nothing you could not get around by using manual range and because the 121GW allows software updates it has been possible to fix these issues on all meters sold.

Note: I do not rate the 121GW as the best DMM ever, but it is a very good meter and like any meter it is not perfect. I do have about all high end meters on the market and I would not rate any of them a clear winner.
 
The following users thanked this post: jancumps, AVGresponding, Archon

Offline EEVblog

  • Administrator
  • *****
  • Posts: 33122
  • Country: au
    • EEVblog
Re: EEVblog 121GW Multimeter Issues
« Reply #1359 on: June 06, 2021, 08:45:07 am »
Hi, new user here. Is this the right place to ask if the above issue was related to manufacturing during the kickstarter? Did it result in a fix of some sort? If I were to order a 121GW right now, can I have confidence it won't have such an issue?

The PCB shim issues was limited to the first few thousands PCB's. That included all the Kickstarter units and a bunch of the first normal production units. All future PCB's have been the correct thickness and the issue was resolved. All units bought today do not have this issue, no one has old stock.
 
The following users thanked this post: AVGresponding

Offline nuclearcat

  • Supporter
  • ****
  • Posts: 367
  • Country: lb
Re: EEVblog 121GW Multimeter Issues
« Reply #1360 on: June 08, 2021, 07:37:36 am »
Hi, new user here. Is this the right place to ask if the above issue was related to manufacturing during the kickstarter? Did it result in a fix of some sort? If I were to order a 121GW right now, can I have confidence it won't have such an issue?

The PCB shim issues was limited to the first few thousands PCB's. That included all the Kickstarter units and a bunch of the first normal production units. All future PCB's have been the correct thickness and the issue was resolved. All units bought today do not have this issue, no one has old stock.
Sorry to ask here, but where to get this shim? I am one of "early kickstarter users", used multimeter very rarely, and i started to get contact issues (i have to press on knob to make multimeter on after changing mode).
Maybe there is some drawings and anything i can do DIY?
« Last Edit: June 08, 2021, 08:15:33 am by nuclearcat »
 

Offline BrianG61UK

  • Regular Contributor
  • *
  • Posts: 53
  • Country: gb
Re: EEVblog 121GW Multimeter Issues
« Reply #1361 on: July 04, 2021, 07:51:55 pm »
Using  low-Z the voltage disappeared.  I read up on ghost voltage.  Yep, that was what I saw.
Thanks for your assistance.
Surely that means your ground is a high impedance, which means it's not ground at all and could be dangerous if you use it to ground something that needs a ground for safety reasons.

It could be induced voltage from a parallel running cable, however I'd recommend it's investigated by a qualified electrician using an installation tester.

I was forgetting that the 121GW in Low-Z mode is brain dead and shows zero even when there is a low voltage present.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf