Author Topic: EEVblog 121GW Multimeter Issues  (Read 88927 times)

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Offline joeqsmith

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Re: EEVblog 121GW Multimeter Issues
« Reply #850 on: October 15, 2018, 05:19:01 am »
I too have to reconnect if the meter falls out of range.    I had a lot of problems with the early versions of Bluetooth not working.  I know very little about BLE and have little experience with it.  The Gossen I have is not BLE but the UNI-T is.  Both meters are good for at least double the distance of the 121 using the same radio. 

I added a simple connect/disconnect test where every five seconds I attempt to connect to the 121GW.  PC is better suited than me manually trying to test it.   

So far, 215 connection attempts, there were 6 times the PC could not connect, or roughly a 3% failure rate.  This is with the 121 right next to the radio.  Again, this is with 1.26 firmware.  What version are you using?   If it's different, I can try to repeat the test with the same firmware you are using.
How electrically robust is your meter?? http://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 

Offline chronos42

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Re: EEVblog 121GW Multimeter Issues
« Reply #851 on: October 15, 2018, 06:24:47 am »
Hi,

I have used Rev. 1.26. for my tests.

Today I had a strange experience.

Now I am using 1.51 and I tried it again today. Now it connected without any problems several times. Between my tests the 121GW firmware has changed and the mobile also got an update recently, maybe this has solved the problem. :-//

No, don't think so.
Meanwhile I belive you were right, there is very likely a disturbance from other bt devices. Not in my home, but from my neighbours. Because today  the bt receiving range also is much higher than at my last tests. And my direct neightbours are not at home....hmmmm

Now it workes as intended except of one exception. After closing the app and restart it, the app did not see the meter again, I have to switch off and on bluetooth at the meter for reconnecting, like before. But that is not a problem for me.
« Last Edit: October 15, 2018, 07:17:22 am by chronos42 »
 

Offline joeqsmith

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Re: EEVblog 121GW Multimeter Issues
« Reply #852 on: October 15, 2018, 06:58:24 am »
I am fortunate that the neighbors are far enough away that they don't cause a problem.   It will be interesting to see when they return if it stops working again.   My CEM meter uses 900MHz with a simple FSK modulation.  I've been amazed at how far that meter will transmit. 

Maybe IanB's problem is similar. 
How electrically robust is your meter?? http://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 

Online IanB

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Re: EEVblog 121GW Multimeter Issues
« Reply #853 on: October 15, 2018, 07:04:35 am »
I am fortunate that the neighbors are far enough away that they don't cause a problem.   It will be interesting to see when they return if it stops working again.   My CEM meter uses 900MHz with a simple FSK modulation.  I've been amazed at how far that meter will transmit. 

Maybe IanB's problem is similar.

I'm not sure about neighbors with Bluetooth. For example, if I turn on my phone when I am in Fry's I see dozens of BT devices available to connect from all around me. My phone is inundated. If I turn on my phone when I am at home I see no BT devices ever, except the devices I own that I have turned on. Granted there could be long range interference, but the problem I had with Windows 10 seemed more like a Windows 10 problem. My Apple devices have never had any issues connecting.
I'm not an EE--what am I doing here?
 

Offline Antonov225

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Re: EEVblog 121GW Multimeter Issues
« Reply #854 on: November 01, 2018, 08:25:12 pm »
Hello EEVBlog!
I feel honored to now be a part of this awesome community. What makes me very sad is that my first post has to be a negative one.

I purchased my 121GW meter on July 26th 2018, during a small batch at official EEVBlog store, after being informed about its availability by the newsletter. Soon I discovered how big mistake I have made.

After receiving the meter and unboxing it, few things immediately stood out. The meter was scratched in many places (especially the knob and in the area around lead sockets) - see attachment. Scratches on two flat sides of the knob clearly came from someone's else fingernails. Part of the knob you grab by your fingers was noticably shinier than other areas. Batteries have also already been put inside the meter - From what I've seen on unboxing videos, these should be included seperately in the pouch.  Conclusion is simple - I recieved a used meter. I thought - "Ok, fine. This is not that bad. I can use this meter nevertheless." And I could - for a month. After that strange things started to happen.

Before making the purchase I did some research online (mainly this forum) and discovered that at some point a common problem with 121GW meters was the knob itself. Apparently there was a recall done at some point regarding the contact issues (knob replacement and addition of a shim). This took place months earlier. Common sense suggested that my meter should have already been free of this issue. This couldn't be farther from the truth.

After a month of very, very light use the meter is basically unusable. The knob wipers stopped making a good contact with the PCB (i think) and the meter reboots constantly while switching modes. Resistance mode cannot be turned on at all. The meter just turns off when I select it. The issue is present for every single knob position.
I made a short video where the issue is clearly visible:



As you can see, this is clearly not a 121GW revision with a fixed knob. I must have received an older, flawed version. This is absolutely unforgivable for a meter this expensive (and every other for that matter). What I find the most frustrating is that the recall was done some time before I bought my meter from the EEVBlog store. At that point I should expect this issue to be already resolved but in the end I recieved a meter with this exact defect still present.

I've sent Dave an email describing these issues on 5th October. He replied a week later and promised to send me a new meter. I was really happy about that. So why am I even writing this post, you may ask? Well, because the new meter has never been shipped and Dave has not replied to any of my emails since then :palm:. I've been trying many times to contact him through at least 3 EEVBlog email adresses and sending him PMs on the forum, asking why the new meter hasn't been shipped. Three weeks have passed and I have not recieved any reply. I have no idea why.

I can only hope that this post will grab Dave's attention and that my meter will get replaced eventually. Do you know if there is any other way to contact Dave or to fix the meter? I just want to be able to use the product i paid for.

Thank you for your help in advance,
A VERY frustrated customer.



 

Offline problemchild

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Re: EEVblog 121GW Multimeter Issues
« Reply #855 on: November 01, 2018, 11:49:05 pm »
I'm sorry to hear this, I really can not comment on the technical problems regarding the meter as I've not played with mine yet as it as only just arrived (yes nearly a month now but you get it!!). Any way I had a similar problem regarding comunications after cleaning up a percieved problem with my address I then asked for confirmation that it was all Ok and the Meter would be sent. After a few weeks I sent another letter to both Daves and then again acouple after and finally yet another a couple of weeks after. At that point I got a reply from Suse the Logistics Lady and my meter arrived all they way from Australia in about 4 days!!

I think that I'm far from been alone in this matter and I also think that Dave isnt been malicious just over worked but we cut him slack since we are not only expecting a quality meter but also hoping to support Dave in a practical manner. That said we dont expect to be ignored for weeks on end, if it wasnt Dave we probably would of made more complaints and probably this would of been picked up by trading standards or by another fancing to make a name by doing to Dave what he's done to others rightly or not!

Dave I hope the Logistics lady is here to stay for a while and keeps it all in order otherwise there will be a queue of replies here I'm sure!
John A
 

Offline bicycleguy

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Re: EEVblog 121GW Multimeter Issues
« Reply #856 on: November 07, 2018, 12:13:08 pm »
As noted in Firmware thread, the latest FW at the store is listed as 1.52 shows on the meter as 1.53.

As usual, change log is lagging.  Haven't noticed a difference from 1.51 which disappeared.  What does it all mean  |O
 

Offline alex-sh

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Re: EEVblog 121GW Multimeter Issues
« Reply #857 on: November 12, 2018, 12:45:27 pm »
Firmware version 1.51
I cannot check capacitance any more - a little dot is blinking and no values coming up on the screen.
Tried several caps.
 

Offline lowimpedance

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Re: EEVblog 121GW Multimeter Issues
« Reply #858 on: November 12, 2018, 04:08:20 pm »
Have you tried 1.52 (1.53) ?.
The odd multimeter or 2 or 3 or 4...or........can't remember !.
 

Online link87

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Re: EEVblog 121GW Multimeter Issues
« Reply #859 on: Yesterday at 05:23:46 am »
Quote
As usual, change log is lagging

Is the ChangeLog available somewhere other than the manual? Seems like it ought to be included in the firmware ZIP or at least as a link beside the download link for it.
 
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Offline Candid

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Re: EEVblog 121GW Multimeter Issues
« Reply #860 on: Yesterday at 05:32:38 am »
This would be way to easy  ::)
 


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