Author Topic: EEVBlog 121GW Discussion thread  (Read 136777 times)

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Offline chronos42

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Re: EEVBlog 121GW Discussion thread
« Reply #1200 on: September 17, 2018, 04:34:21 am »
Hi,
that is true, the battery holders are terrible. That was also my first impression.
The worst springs of all my battery powerd instruments. I have aligned the springs with a small tweezer, so now it lookes a bit better.
Beside of this a great meter with some room of improvement in the firmware.
 

Offline 1anX

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Re: EEVBlog 121GW Discussion thread
« Reply #1201 on: September 17, 2018, 07:51:39 am »
Hi,
that is true, the battery holders are terrible. That was also my first impression.
The worst springs of all my battery powerd instruments. I have aligned the springs with a small tweezer, so now it lookes a bit better.
Beside of this a great meter with some room of improvement in the firmware.
I think all of us who bought this meter were shocked at the springs fitted in the battery holder. A well made battery holder fitted with springs which are simply too long.

To use a "Dave" expression when reviewing products the springs are a "FAIL"!

Good meter fitted with the wrong length battery springs, how did this get into the production run?
 

Offline stig

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EEVBlog 121GW Discussion thread ESR of capacitors measurment
« Reply #1202 on: September 17, 2018, 05:32:39 pm »
Was just wondering if it would get ESR in the capacitance measurment aswell :)
 

Offline CDaniel

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Re: EEVBlog 121GW Discussion thread
« Reply #1203 on: September 17, 2018, 08:36:48 pm »
This multimeter has in theory an 50000 counts display , than range switching upward  at 55000 counts but downward at 40000 counts  is supposed to be a feature ?
I find this rather annoying ... lets say  I want to adjust a 5.0000V voltage refference , if I go up beyond 5.5000V I lose the last digit of resolution because is switching the 50V range , but then if I adjust downward I can't get it back since it remains in 50V range until it reaches 4V

« Last Edit: September 17, 2018, 09:21:48 pm by CDaniel »
 

Offline Cliff Matthews

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Re: EEVBlog 121GW Discussion thread
« Reply #1204 on: September 17, 2018, 10:20:07 pm »
@CDaniel - Why not use the provided range switch?
 

Offline CDaniel

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Re: EEVBlog 121GW Discussion thread
« Reply #1205 on: September 17, 2018, 10:32:54 pm »
@CDaniel - Why not use the provided range switch?

Because it has autorange ...  |O
 

Offline Cliff Matthews

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Re: EEVBlog 121GW Discussion thread
« Reply #1206 on: September 18, 2018, 12:54:51 am »
@CDaniel - You said you can't get it back after you turned down V-ref.. go manual to desired range, then flip it back to auto.
 

Offline CDaniel

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Re: EEVBlog 121GW Discussion thread
« Reply #1207 on: September 18, 2018, 02:27:11 am »
Sure I could , but I don't think is normal to be 2 thresholds , that is my point .
And that was just an example .
« Last Edit: September 18, 2018, 02:28:55 am by CDaniel »
 

Online newbrain

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Re: EEVBlog 121GW Discussion thread
« Reply #1208 on: September 18, 2018, 02:28:50 am »
This multimeter has in theory an 50000 counts display , than range switching upward  at 55000 counts but downward at 40000 counts  is supposed to be a feature ?
I find this rather annoying ... lets say  I want to adjust a 5.0000V voltage refference , if I go up beyond 5.5000V I lose the last digit of resolution because is switching the 50V range , but then if I adjust downward I can't get it back since it remains in 50V range until it reaches 4V
I would consider this quite normal, though the hysteresis is a bit on the wide side.

This is what happens with my Fluke 87V:
Counts
Up at
%
Down at
%
6000
6.600
+10
5.40
-10
20000
19.999
+0
16.80
-16(Of course, it can't display > 19999)

The 121GW does it at +10% and -20%.

Sure I can , but I don't think is normal to be 2 thresholds , that is my point .
It's definitely normal! Without hysteresis you would have continuous range change at the threshold, a much worse experience.
Nandemo wa shiranai wa yo, shitteru koto dake.
 

Offline darik

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Re: EEVBlog 121GW Discussion thread
« Reply #1209 on: September 18, 2018, 02:40:49 am »
Sure I could , but I don't think is normal to be 2 thresholds , that is my point .
And that was just an example .

I have 4 meters. They all have two thresholds like that. I would imagine to prevent excessive autoranging when taking measurements near the threshold value. I believe it's called hysteresis.
 

Offline CDaniel

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Re: EEVBlog 121GW Discussion thread
« Reply #1210 on: September 18, 2018, 02:45:54 am »
Ok , you are wright , I cheked my other multimeter who has 6,6V up and 6,2V down , which is much smaller and I never noticed since is not around 5V ( I don't think that's random design )
« Last Edit: September 18, 2018, 02:51:31 am by CDaniel »
 

Offline IanB

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Re: EEVBlog 121GW Discussion thread
« Reply #1211 on: September 18, 2018, 04:19:56 am »
Sure I could , but I don't think is normal to be 2 thresholds , that is my point.
And that was just an example.

There will always be two thresholds to prevent "hunting" of the auto-range circuit when close to the switch point.
I'm not an EE--what am I doing here?
 

Offline Seppy

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Re: EEVBlog 121GW Discussion thread
« Reply #1212 on: September 24, 2018, 11:40:38 am »
V1.51 Firmware released, change log will be in the manual soon.
www.eevblog.com/product/121gw/
 
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Offline bicycleguy

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Re: EEVBlog 121GW Discussion thread
« Reply #1213 on: September 24, 2018, 11:58:57 am »
FYI, Installed, no problems. 
 

Online Jon.C

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Re: EEVBlog 121GW Discussion thread
« Reply #1214 on: September 24, 2018, 03:21:19 pm »
 
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Offline bicycleguy

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Re: EEVBlog 121GW Discussion thread
« Reply #1215 on: September 25, 2018, 07:21:18 am »
I couldn't take it any longer :-/O

« Last Edit: October 15, 2018, 06:47:06 am by bicycleguy »
 
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Offline 1anX

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Re: EEVBlog 121GW Discussion thread
« Reply #1216 on: September 25, 2018, 08:19:21 am »
I couldn't take it any longer :-/O

Great idea!
The meter could be made with a small removable cover for this very purpose and retain rating?
 

Offline bicycleguy

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Re: EEVBlog 121GW Discussion thread
« Reply #1217 on: September 25, 2018, 08:24:42 am »
...
Great idea!
The meter could be made with a small removable cover for this very purpose and retain rating?

Don't know about whatever governments rules and regs but a piece of electrical tape seems to seal it pretty good. ^-^
 

Offline joeqsmith

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Re: EEVBlog 121GW Discussion thread
« Reply #1218 on: September 25, 2018, 09:23:26 am »
I couldn't take it any longer :-/O

Ok, I have to ask.  Did you make this modification because you log a lot to the SC card or was it because of the number of firmware updates you have done?

When I was running so many tests on the meter,  I left the cover off because I was logging to the SD card.  Now that I have the wireless interface mostly sorted out, I think it's going to come down to if they ever add support to off load the SD card from the wireless link.  I would like to see everything done through that wireless link, including firmware updates.   

IMO, that modification you did speaks volumes!!  If people are getting to this point, something is wrong!!
How electrically robust is your meter?? http://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 

Offline bicycleguy

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Re: EEVBlog 121GW Discussion thread
« Reply #1219 on: September 25, 2018, 09:29:52 am »
...
Ok, I have to ask.  Did you make this modification because you log a lot to the SC card or was it because of the number of firmware updates you have done?
...

Yes >:D
 

Offline Bratster

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Re: EEVBlog 121GW Discussion thread
« Reply #1220 on: September 25, 2018, 03:18:00 pm »
I couldn't take it any longer :-/O
Brilliant!
Edit: but keep in mind that this does either partially or completely negate the CAT safety rating of the meter.

Sent from my Fi Moto x4 using Tapatalk
« Last Edit: September 26, 2018, 06:40:05 am by Bratster »
 

Online Brumby

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Re: EEVBlog 121GW Discussion thread
« Reply #1221 on: September 25, 2018, 05:31:17 pm »
Has anyone stopped for a second and asked why such a cutout might NOT be a good move?


The issue isn't new.  It has been discussed during earlier development.
 

Offline 1anX

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Re: EEVBlog 121GW Discussion thread
« Reply #1222 on: September 25, 2018, 07:32:44 pm »
Has anyone stopped for a second and asked why such a cutout might NOT be a good move?


The issue isn't new.  It has been discussed during earlier development.
Its his meter and he can hack it to how it works best for him!

Just as you can do whatever you want to your meter, hack away or not, its your choice!
 

Offline firewalker

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Re: EEVBlog 121GW Discussion thread
« Reply #1223 on: September 25, 2018, 07:49:42 pm »
I would prefer a more rectangular hole for a rubber cap. To stop moisture and dust. I believe moisture could effect the current amplifier fronted.
 
Alexander.
Become a realist, stay a dreamer.

 

Offline joeqsmith

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Re: EEVBlog 121GW Discussion thread
« Reply #1224 on: September 25, 2018, 09:33:48 pm »
I would prefer a more rectangular hole for a rubber cap. To stop moisture and dust. I believe moisture could effect the current amplifier fronted.
 
Alexander.

I assumed it was so they could pull the card out with tweezers or needle nose pliers. 
How electrically robust is your meter?? http://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 


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