Gossen Ultra, 121GW and Brymen BM869s stability
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- Опубликовано: 1 сен 2023
- 500mV source from Fluke 731B reference. No warmup allowed. Just showing how unstable the EEVBLOG 121GW is compared with the other two meters.
For context, please see the following thread on EEVBLOG:
www.eevblog.com/forum/testgea... 
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Maybe the audio is bad, I could not hear the explanation or comments from the author.
Check the description for a link which provides the context.
Since you are very acquainted with UEI products by now, any chance you would do your robustnes test on one of their dual display clamps? Perhaps DL369/389 or DL489? The Dual display is very useful for HVAC applications for viewing current and other parameter simultaneously, so it would be interesting to see how they stack up to the rest of the field robustness wise.
I just tried this using my PDVSII mini as a source. My Bryman BM869s showed ±2 1µV digits in the 500,000 count mode. My 121GW showed ±1 10µV digit. Both of these results are good.
Did your stress testing of the 121GW cause the added noise on yours? You did not test for that, you were only looking for hard failures.
If you read the few posts in the thread linked in the description, there was no destructive tests ran on this meter. I had bought two. One to test, the other to keep as a reference. The one I tested was damaged beyond repair.
@@joesmith-je3tq I apologize for not recalling the details of your 121GW tests. It was many months ago I watched them.
I made a short video and published it my RUclips page showing my test of the BM869s & 121GW. My 121GW is quiet and stable. Since we each only have one working version of the meter it is impossible to say if your experience or mine is more typical. However your test does show that the 121GW you have is noisy.
Can you test Hioki meters for stability?
by the way, it is not a Gossen multimeter but a Metrawatt multimeter. Gossen makes hi-end power supplies and Lloyds certified instruments for ships and lighting measuring stuff. Metrawatt is the one who specializes in quality multimeters.
Are we talking about the Gossen meter I tested some time ago that is clearly labeled Gossen Metrawatt on the face?
@@joesmith-je3tq yes exactly. Gossen-Metrawatt is the consortium, actually the swiiss Camille-Bauer is also part of it.But these are three different firms and Metrawatt is the one that makes the multimeters.
I'm ready for BM 869S vs HP 34401A. I always thought that 500,000 count feature was a gimmick, but maybe not?? Joe is da DMM man 👍
What kind of fluke would.you recommend ?
Why are some of these so hard to find for sale?
I know you don't like to brag but I'd like to know your story and work history and some of the big projects and such you've worked on. I've seen videos where you show some amazing prototypes you've built but I'm a big fan and I'd like to see some of the other things you've worked on and how you got your start and such. If you don't mind
I did make one video where I told a couple of early stories and thought about making a few more like that.
Bm 869 s only few micro Volts deviations not bad, how fluke 289 or some high end agilent performs in same situation interesting? A fought about buying 121, but I guess it is not good idea. Bm s only crest function (max/min) behaves strange, over functions for ordinary user works well as for me.
I don't own the 289 and the high end Keysight meter I bought for testing was damaged beyond repair. That's 2 for 2 on Keysight.
@@joesmith-je3tq think BM need in recalibration (its not a problem 4 u). GM 1 of my favorite MM. 121GW also useable in outdoor progects such as prechecking something or testing HV light-diods (its not a precise MM). In pair with a cheap clamp adapter 121GW also can mesure inrush current.
HI Joe. Measure the shunt resistance voltage (current sensor) in AC millivolt position with BM869s. you will get wrong result.
All meters in all functions will give wrong results. The question is how wrong. As long as it meets the manufactures specs, no problem.
View the following post: www.eevblog.com/forum/testgear/saving-yet-another-fluke-189/msg5049970/#msg5049970
The first one is not counting. The two after are counting measurements points
lol. The Gossen is so stable it looks like it doing nothing.
the video didn't show, and you didn't mention, the Gossen multimeter model
Ultra, now known as Prime after I showed all of it's problems.
@@joesmith-je3tq You were pretty obsessed about the lack of shielding, but your reviews didn't go into much else. In this video, the Gossen looks like it's the most stable
Hum ? Or noise
The Gossen is like $1000
What meters are you using?
In the description, there is a link that provides context if you are interested.
Wow. Unpleasantly noisy.