Author Topic: EEVblog 121GW Multimeter Issues  (Read 199544 times)

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Online CDaniel

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Re: EEVblog 121GW Multimeter Issues
« Reply #900 on: July 07, 2019, 04:05:40 am »
You can try a zero offset callibration for that range as described in the manual . I did that myself for current offsets ( obvious not that bad that yours )
 

Offline stuartmp

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Re: EEVblog 121GW Multimeter Issues
« Reply #901 on: July 07, 2019, 04:47:35 am »
You can try a zero offset callibration for that range as described in the manual . I did that myself for current offsets ( obvious not that bad that yours )
Ok so I can do a offset calibration without affecting my range calibration?

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Online CDaniel

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Re: EEVblog 121GW Multimeter Issues
« Reply #902 on: July 07, 2019, 05:14:36 am »
Yes you can and it's simple .
 

Offline stuartmp

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Re: EEVblog 121GW Multimeter Issues
« Reply #903 on: July 07, 2019, 05:51:41 am »
Yes you can and it's simple .
Ok. So its fixed but I didn't do anything besides steps 1 to 5 from page 65. Turning it on from the 3 o'clock position anti clockwise to the A / mA position. When I pressed the Rel button I noticed that the offset went back to zero. So I thought I wonder if this did anything. So I  just turned it off and back on again and it was fine back to zero. Very strange.



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« Last Edit: July 07, 2019, 06:01:10 am by stuartmp »
 

Online CDaniel

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Re: EEVblog 121GW Multimeter Issues
« Reply #904 on: July 07, 2019, 06:00:11 am »
Who knows what firmware or calibration bug you had , good that now it is ok .

Anyway for everyone who has some current offset ... the latest firmware it seems to do a better job zeroing the offset  . Before I couldn't do it so good .
« Last Edit: July 07, 2019, 06:14:15 am by CDaniel »
 

Offline stuartmp

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Re: EEVblog 121GW Multimeter Issues
« Reply #905 on: July 07, 2019, 06:04:54 am »
Who knows what firmware or calibration bug you had , good that now it is ok
One other thing that I noticed was that in mVA/VA mode the Range scale indicator does not change it just says '5' in the bottom right corner not matter what range you select. Is this normal?

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Online CDaniel

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Re: EEVblog 121GW Multimeter Issues
« Reply #906 on: July 07, 2019, 06:29:50 am »
That is a bug that now I see ... the range number stay in the last used range on the other functions , so if it was 50 or 500 in current mode and you switch to VA it will show 50 or 500 and so on  . The default is 5 if you turn it fast from OFF to VA and doesn't have time to settle anywhere
« Last Edit: July 07, 2019, 06:49:07 am by CDaniel »
 

Offline stuartmp

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Re: EEVblog 121GW Multimeter Issues
« Reply #907 on: July 07, 2019, 06:49:05 am »
That is a bug that now I see ... the range stay in the last used range on the other functions , so if it was 50 or 500 in current mode and you switch to VA it will show 50 or 500 and so on  . The default is 5 if you turn it fast from OFF to VA and doesn't have time to settle anywhere
So how does the bug get reported and fixed in a future firmware update.

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Online CDaniel

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Re: EEVblog 121GW Multimeter Issues
« Reply #908 on: July 07, 2019, 06:52:06 am »
Maybe someone read this thread , or you can report directly at https://www.eevblog.com/product/121gw/ you have there "Report an Issue" . I did that a number of times .
« Last Edit: July 07, 2019, 06:57:25 am by CDaniel »
 

Offline e0ne199

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Re: EEVblog 121GW Multimeter Issues
« Reply #909 on: July 07, 2019, 08:48:09 am »
has anyone noticed this?
try to turn burden voltage on, set the 121GW to 10A range and measure load current without using its voltage probe
mine on 10A range, the current reading drops about 2mA when the burden voltage is on, but when i turn the burden voltage off, the current reading on 10A range is back to normal again (without 2mA drop)...
no problems with burden voltage turned on or off when i set the meter to 5A or 500mA range

is this a bug or something? please respond, thx


I don't see this particular issue clearly , but may be explicable ... with the voltage probe inserted and burden turn on  is picking up the electrical field noise which somehow interfere with the current reading . So when I touched the voltage probe tip from 930mA the reading went to 990mA . Pretty insane .
Even that non zero current offset when you don't measure anything changes when you put the hands near the terminals ...

actually it happens only on 10A range, on the other range it looks normal...
that 2mA drop is really pain in my eyes anyway  ;D
« Last Edit: July 07, 2019, 09:00:21 am by e0ne199 »
 

Online CDaniel

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Re: EEVblog 121GW Multimeter Issues
« Reply #910 on: July 07, 2019, 10:04:17 am »
May be an issue but I don't see it ...

Burden-off" border="0Burden-On" border="0
« Last Edit: July 07, 2019, 10:08:06 am by CDaniel »
 

Offline e0ne199

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Re: EEVblog 121GW Multimeter Issues
« Reply #911 on: July 07, 2019, 11:53:37 am »
May be an issue but I don't see it ...

Burden-off" border="0Burden-On" border="0

looks like it is only my problem...what firmware version do you use?
on me sometimes the bargraph flashes and after that the meter shows correct value...but about one second after that the value drops 2mA again...i hope this is just a software issue anyway
 

Online CDaniel

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Re: EEVblog 121GW Multimeter Issues
« Reply #912 on: July 07, 2019, 01:33:33 pm »
V2.00 and the bargraph flashes sometimes
 

Offline kf4hzu

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Re: EEVblog 121GW Multimeter Issues
« Reply #913 on: July 08, 2019, 12:25:36 pm »
So I’ve posted before about this but the Bluetooth radio in my meter isn’t working. My buddy’s meter will connect instantly but mine will not. Using a Bluetooth scanner does not detect the meter at all. This leads me to believe the radio is not functioning. Anyone else have this issue?

Are you trying to connect / find both meters from the same device? Have you tried several different devices (phone, PC, tablet)? What distance is your meter at from the device? What firmware version are both meters running?
 

Offline uer166

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Re: EEVblog 121GW Multimeter Issues
« Reply #914 on: July 09, 2019, 08:48:27 pm »
The banana socket tips on my meter broke off with normal use, nothing was forced. I used Pomona banana cables inserted into meter. NBD for functionality, but it's a brand new meter and doesn't feel great..
 

Offline Terry01

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Re: EEVblog 121GW Multimeter Issues
« Reply #915 on: July 09, 2019, 09:18:58 pm »
How did you manage to break both Current jacks? That sucks buddy  :(
Sparks and Smoke means i'm nearly there!
 

Offline uer166

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Re: EEVblog 121GW Multimeter Issues
« Reply #916 on: July 09, 2019, 09:37:33 pm »
Again they just fell off after normal use, no yanking or force. In fact the 10A jack broke after one single careful insertion of the banana jack  :palm: :palm: :'( :'(
 

Offline Brumby

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Re: EEVblog 121GW Multimeter Issues
« Reply #917 on: July 10, 2019, 04:34:19 am »
I don't think I've heard of that before - and I'm puzzled as to how it could have happened (... and I'm not just talking about the 121GW).
 

Offline joeqsmith

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Re: EEVblog 121GW Multimeter Issues
« Reply #918 on: July 10, 2019, 04:59:56 am »
I cracked one on the prototype but take full blame as I frequently used non shrouded leads with it.   I'm not too concerned about it and assume they used a different material for the released meters that would make them more robust.   

I'm surprised to see them sheared off like this.   With non shrouded leads installed, if it were dropped maybe it could cause it.   
How electrically robust is your meter?? https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 

Offline uer166

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Re: EEVblog 121GW Multimeter Issues
« Reply #919 on: July 10, 2019, 05:02:05 am »
Can confirm they were non-shrouded leads. Can also confirm meter was never dropped and leads were not yanked... Unless someone else at the lab did it of course.
 

Offline Electrowiz

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Re: EEVblog 121GW Multimeter Issues
« Reply #920 on: July 11, 2019, 04:53:23 am »
U2.00 Firmware has a minuscule bug to report. I have been working with thermocouples, as of late. Working with a Temperature calibrator, I needed to change the setting to Deg C to match the calibrator.

I pushed and held the SETUP button, until the top temp indicator began to flash. Then pushed the Up/Down arrow, which toggled the temperature scale from Deg F to Deg C. I continued taking readings and recording the results. After 2 minutes the temperature scale reverted back to Deg F except the main indication still read Deg. C. However the indication was clearly back to Deg F scale. (See attachment)

I obviously did not confirm the scale change, thus causing the display scale mismatch.
« Last Edit: July 11, 2019, 05:07:23 am by Electrowiz »
 

Offline bicycleguy

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Re: EEVblog 121GW Multimeter Issues
« Reply #921 on: July 11, 2019, 08:02:17 pm »
@Electrowiz
I can confirm the problem you saw as a minuscule operator/meter error  |O  If you forget to press and hold the setup button again after changing to F/C, then it will mess up as you described.
« Last Edit: July 11, 2019, 08:04:44 pm by bicycleguy »
 

Offline graybeard

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121GW micro SD card size limit
« Reply #922 on: July 12, 2019, 01:14:07 am »
What is the size limit (if any) for the micro SD card in a 121GW?  I can't find anything in the manual about it.
 

Offline jchw4

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Logging needs more clarification in the manual
« Reply #923 on: July 22, 2019, 12:37:47 pm »
Hello from another happy owner of 121GW (2.00)!

User manual does not say much about SD card logging, but it has a few caveats:

1) Autoranging does not work when logging is on. ("Auto" is still displayed though.)
DMM will log "-Overflow" and "Overflow" instead of switching ranges.

2) In "In 0" mode logging intervals are not even. DMM visibly stops every 5-10 (haven't calculated yet) values. I would assume it flushes data to SD card.
On average it still reaches ~4.77 records per second.

3) It's possible to make it totally stop for several seconds (like 10) by starting and stopping logging. I would assume it is the same SD card data flushing.

If these are features not bugs, please update the manual.


 

Offline dr.diesel

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Re: EEVblog 121GW Multimeter Issues
« Reply #924 on: July 25, 2019, 07:42:10 pm »
I've got two of these, updating the 1st went without an issue (just like all the other times I've done this), #2 locked up during the v2.0 update.  After about 10 minutes of just letting it be I finally switched it off and back on:

 :-//

Also note, the MEM and HOLD buttons no longer respond on power up.


« Last Edit: July 26, 2019, 01:20:44 am by dr.diesel »
 


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