Poll

Are you interested in seeing more handheld meters tested?

This testing is pointless! Please STOP damaging these meters!
3 (6.4%)
 Yes, I would like to more meters tested.
44 (93.6%)

Total Members Voted: 47

Author Topic: Handheld meter electrical robustness testing.  (Read 531114 times)

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Offline malagas_on_fire

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Re: Handheld meter electrical robustness testing.
« Reply #3100 on: January 09, 2019, 12:26:52 pm »
Hi.

What about leaving the ut2104A in always on mode and re-check again the voltage on the battery without remove it (it has a 8.4V 220mAh nimh currently)  Then with the same procedure using a fresh duracell ultra. 
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Offline stj

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Re: Handheld meter electrical robustness testing.
« Reply #3101 on: January 09, 2019, 01:07:02 pm »
you should reallly be running a pair of wires from the battery in the meter to test it's output while it's in circuit and the meter is on.
 
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Online rsjsouza

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Re: Handheld meter electrical robustness testing.
« Reply #3102 on: January 09, 2019, 03:00:42 pm »
Just a note: I added the BM857 and the 8060A to the table at my previous post:
https://www.eevblog.com/forum/testgear/hear-kitty-kitty-kitty-nope-not-that-kind-of-cat/msg2100013/#msg2100013

(Uni-T UT136C, Mastech MAS830L and Fluke 27/FM brown coming next)
« Last Edit: January 10, 2019, 02:43:41 pm by rsjsouza »
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Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 
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Offline malagas_on_fire

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Re: Handheld meter electrical robustness testing.
« Reply #3103 on: January 10, 2019, 09:29:45 am »
Hi

First of all want to apologize for the big mistake on the procedure taken to measure batteries. So n00bian from my part :(


Willing to do another test to check the cut-off voltage of the uni-t 9V using proper techniques to see if it is unpar with the uni-t meters that you have and check if any thing weird on 204A is going on between batteries or might doing something wrong.

Edit

Don't have yet a adjustable power  supply so going to relly on batteries...
« Last Edit: January 10, 2019, 09:43:50 am by malagas_on_fire »
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Online rsjsouza

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Re: Handheld meter electrical robustness testing.
« Reply #3104 on: January 11, 2019, 02:55:14 pm »
Yet another (most probably final) edit to my table at:
https://www.eevblog.com/forum/testgear/hear-kitty-kitty-kitty-nope-not-that-kind-of-cat/msg2100013/#msg2100013

Added the UT136C, 27/FM and MAS830L

The verdict is that you can't beat the venerable ICL7106 in power consumption.  ;D
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Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 

Offline malagas_on_fire

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Re: Handheld meter electrical robustness testing.
« Reply #3105 on: January 12, 2019, 12:40:48 pm »
This way... meter powers down, open the case, take out the battery and measure voltage with another meter...Should i measure when it is still on the meter even if is supposelly powered off? I can re-run this with the 204A because it can be turned to always on...and draws 1mA in Vac mode.

Broadly speaking, you need to know that NiMH fully drained cells "rebound" when you take the load off them. For example, a completely drained NiMH cell may have an open circuit voltage of ~1.2 V. You can put a small load on it and the voltage will drop down to 0.5 V or lower. Take the load off the cell and the voltage will rapidly rise up towards 1.2 V again. The best way to see this happening is to have the cell attached to the voltmeter when you do this experiment.

Thanks again and i've yet tested with another battery operated device, which gave similar result ( less voltage drop) as you mentioned:

https://www.eevblog.com/forum/testgear/hear-kitty-kitty-kitty-nope-not-that-kind-of-cat/msg2102320/#msg2102320



Alkaline cells don't behave the same way. They have a very small rebound or recovery, but it is much less pronounced.

Just a reminder:

https://www.eevblog.com/forum/testgear/hear-kitty-kitty-kitty-nope-not-that-kind-of-cat/msg2102320/#msg2102320

...tested with 2x AA NIMH cells with chrismas lights untill they turned off, measure voltage without removing them got 1.187V / 1.169V . When taken out they went right to 1.2V and rising...   :palm: |O dooohnhh
« Last Edit: January 18, 2019, 10:43:17 am by malagas_on_fire »
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Offline malagas_on_fire

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Re: Handheld meter electrical robustness testing.
« Reply #3106 on: January 18, 2019, 10:49:54 am »
Quote
I assume you own all of them that use 9V batteries and tested them to make a statement like that.   If you watched that short video, you would have seen how low my UT61E ran.  rsjsouza also tested their UT61E and posted the results.  I also posted data for the UT90.   

Well that is in the description of the product sheet or specifications of the uni-t. So for example on uni-t 61E < = 7.5 V, the 7.5V would be  a worst case scenario?

Product Specification for uni-t 61E as an example:

http://www.uni-trend.com/productsdetail_1971_1105_1105.html

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Online rsjsouza

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Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 

Offline HKJ

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Re: Handheld meter electrical robustness testing.
« Reply #3108 on: January 25, 2019, 03:31:41 pm »
All my multimeter reviews (more than 80) contains current measurement for the meters and estimated runtime until they report empty battery. The estimated runtime is based on discharge curves at different currents.
 

Offline bc888

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Re: Handheld meter electrical robustness testing.
« Reply #3109 on: January 25, 2019, 06:39:38 pm »

Fluke 27/FM for the win. Thanks RSJ for the list. Interesting that a 20+ year old meter is able to lead the pack.
 
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Offline malagas_on_fire

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Re: Handheld meter electrical robustness testing.
« Reply #3110 on: January 30, 2019, 10:09:30 pm »
Hi.

I've catch the uni-t 204A clamp meter powered off and read the voltage of the NIMH battery inside the meter... 2.25V.... It must be draining the battery even shutted off probably...

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Online rsjsouza

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Re: Handheld meter electrical robustness testing.
« Reply #3111 on: January 31, 2019, 04:03:35 pm »
Malagas, depending on the NiMH battery it may have a pretty high self discharge. Otherwise, I would inspect the quiescent current of your clamp - it shouldn't be difficult with a fresh charge and the multimeter you have in uA/mA mode.
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Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 
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Offline malagas_on_fire

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Re: Handheld meter electrical robustness testing.
« Reply #3112 on: February 01, 2019, 04:08:57 pm »
Thanks for the advice rsjsouza.


Plan to do a setup to measure also the current consumption in all modes to check what does get more energy from the battery using aligator clips to a multimeter in mA / uA . Also check if the current setups doesn't add up to the measure, eg bad aligator clips, bad leads. 

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Online rsjsouza

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Re: Handheld meter electrical robustness testing.
« Reply #3113 on: February 01, 2019, 04:40:51 pm »
That is cool, Malagas. This is similar to the data I got from the meters I tested and shown in the attached photograph.

I plan to do a test on the quiescent current on standby, but that takes quite a long time waiting for the meters to power off automatically.

 
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Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 

Offline joeqsmith

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Re: Handheld meter electrical robustness testing.
« Reply #3114 on: February 04, 2019, 01:19:36 am »
Would you pay $1522 for a free Harbor Freight meter?  My first digital VOM gets an overhaul.

https://youtu.be/ObKomuLLqU8
How electrically robust is your meter?? https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 
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Offline malagas_on_fire

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Re: Handheld meter electrical robustness testing.
« Reply #3115 on: February 04, 2019, 10:11:51 pm »
Hi here is my first tryout to measure current in a DMM in order to check its power drain using a almost fresh NIMH cell.. a newbie one...

Conditions....:

. DMM: Uni-t 204A clamp meter.
- Cell: 9V NIMH 220mAh
- Leads:  Using old aligator leads plugged  to terminais ( plan to user newer ones or dummy cell)
- Current Measurement: Multimeter Unit-50b in 20 mA scale in series with battery + standard test leads +  old aligator clips 
- Voltage Measurement ( Battery and DMMterminais) : Uni-t 120C

Measurements
- Check attachments .. in portuguese... sorry :P
- Battery Voltage measurement on battery and contacts was taken on the 40A DC


Further tests involves switching aligators clips,test leads, dummy cells. Measurement multimeters for better accuracy on the results. 

If there is anything missing which is.. quote ::P
If one can make knowledge flow than it will go from negative to positve , for real
 

Offline joeqsmith

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Re: Handheld meter electrical robustness testing.
« Reply #3116 on: February 16, 2019, 09:25:14 pm »
Starting to work on a new video but the German's are getting me down.  But if you like seeing old meters, stay tuned..
How electrically robust is your meter?? https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 
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Online rsjsouza

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Re: Handheld meter electrical robustness testing.
« Reply #3117 on: February 16, 2019, 11:15:32 pm »
Starting to work on a new video but the German's are getting me down.  But if you like seeing old meters, stay tuned..
Oh, no! What did Gossen do this time?!? Did they set radiowave or magnetic weapons around your house to make all meters go wild?
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Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 

Offline malagas_on_fire

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Re: Handheld meter electrical robustness testing.
« Reply #3118 on: February 16, 2019, 11:40:33 pm »
Hope it's not Benning MN12 and software for windows is not working properly ....

https://www.benning.de/products-en/testing-measuring-and-safety-equipment/digital-multimeter/benning-mm-12.html

Looks nice with BLE , 40000 counts , AC+DC but on the other hand more expensive ...
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Offline bitseeker

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Re: Handheld meter electrical robustness testing.
« Reply #3119 on: February 17, 2019, 01:03:35 am »
Starting to work on a new video but the German's are getting me down.  But if you like seeing old meters, stay tuned..

 /me is staying tuned. :-DMM
I TEA.
 

Offline joeqsmith

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Re: Handheld meter electrical robustness testing.
« Reply #3120 on: February 17, 2019, 03:45:34 am »
Made some progress today and saw something that I have never seen before, even with all the low end meters I have looked at.   Like many of my videos, I got a little sidetracked as well. 

Testing continues on the pocket meter that True claims they had damaged some high number of.   I don't think they ever did post again after making that first video.  Someone also asked me about running an experiment which I have decided to take on for fun.  Bouncing between the three videos as I have time.   Combined with work and other interests, I haven't been spending much time with the meters.   So be patient and perhaps in a couple of weeks you can see a brand I havn't yet looked at. 
How electrically robust is your meter?? https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 
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Offline stj

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Re: Handheld meter electrical robustness testing.
« Reply #3121 on: February 18, 2019, 01:34:08 am »
a real one - looks similar

 

Offline joeqsmith

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Re: Handheld meter electrical robustness testing.
« Reply #3122 on: February 18, 2019, 01:49:36 am »
Notice the complex markings on this one.  Real or counterfeit?  We need our fuse expert Fungus to weigh in.   

I've written SIBA before about possible counterfeit fuses and they are pretty much like dealing with Gossen or a vacuum, your pick.
How electrically robust is your meter?? https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 

Offline Fungus

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Re: Handheld meter electrical robustness testing.
« Reply #3123 on: February 18, 2019, 09:17:41 am »
a real one - looks similar


Quality of the printed letters is much better on that one.
 

Offline joeqsmith

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Re: Handheld meter electrical robustness testing.
« Reply #3124 on: February 18, 2019, 01:03:05 pm »
No comment on the third one I posted?

I am willing to take these apart and take any measurements you would care to see if you have original SIBAs that we could compare them with.   
How electrically robust is your meter?? https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 


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