Gossen Metrawatt Metrahit Ultra M248B Review Part7
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- čas přidán 30. 06. 2024
- In this video we have a closer at the MHz feature of the Ultra and compare with my CEM and Brymen meters. Also what appears to be a firmware bug with the MHz feature is also demonstrated. The meter is then transient tested and Dave's meter once again takes center stage.
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Gossen should send you all thier meters then pay you to do the tests. You are clearly doing a better job than the in house folks. It always greves me to see a company defend itself when they are clearly wrong, rather than thank the people that find problems and just fix the issues.
Anyone with a basic skill set and a half a day to play with this meter would have known it had problems. I assume GMC knew about everything I have pointed out and just felt it was good enough. The flip side is we say they had no clue, which then you REALLY have to wonder about their whole design process. No matter how you look at it, I am very surprised this meter has so many problems.
Gossen could better inform their customers as to what they are getting for their money with this meter. By inserting an "s" between the a and the h in Metrahit. Thanks again for these excellent posts .
i like how youre editing the functional tests now. cutting those seconds between readings out makes a nice difference.
Great series of vids Joe, up there with Who Shot JR!
Thanks for the time and work.
Great job, Mr. Smith . At this point you should get refunded, after all 800+ USD is not a small amount of money. Hell, I would pay you if I was Gossen, for the research you did. You might have saved a life and an expensive lawsuit with the discovery of the relay issue
Thanks, glad you enjoyed it.
Hi Joe, great video, I was having high hopes for this meter but gee so many issues for such an expensive bit of gear, hopefully gossen can pull their finger out and get it sorted, it doesn't make me want to go out and purchase one!
I can't see me ever wanting to buy another after evaluating this one.
HI!
Nice testing in this series; I do have a question: how can I build a proving box similar to yours and what type of components to look for? (values that you recommend, precision and usage type wise ...)
It's called a decade box. It's just individual components like resistors and capacitors mounted on the inside of the case to those screws sticking through the lid. It's basically the same as just connecting to bare resistors and capacitors.
Use 1% or better high accuracy components.
nice to see it at least held up considering the price on that. I was hoping for a violent ending to that thing lol
It looks like they have the input protection down. Electrically, the meter is as robust as the best ones I have come across.
About 40 years ago I bought a Gossen Lunasix light meter and I could never get it to give an accurate incident reading.
@Joe, you have thoroughly tested a lot of multimeters during the years, if you would recommend a high accuracy one mainly used for electronics and at least 4 1/2 digits which one would it be?
If you ever decide to read the FAQ, you will find I do not make recommendations.
Hmm, but if you did, it would be the Brymen BM869... wouldn't it?...ha
It depends. For my personal basic electronics, home hobby use, it's a good fit but there are a lot of meters out there. Do your own homework.
Hi Joe, i usually do my own homework, but this was just a joke.
I can sure tell your itching to get your hands on the GW121..
but onto this one.
man there sure is a lot of issues/quarks with this meter, more so then i have seen with any other meter, that you have ran/ looked at.
and not in this vid but a different one, about the EMI shielding that you made for this meter. it just goes to show how important good EMI shielding is.
One day that 121GW will be available.
31 Mar 2021
I wonder if the issues you found with the M248B have been fixed?
They never followed up. The last I saw, they have now renamed the meter but have maintained the part number. It appears marketing is more important than engineering to them. If you purchase one, be sure and let us know how it works.
@@joesmith-je3tq Thanks for the reply. I see at "Gossen Metrawatt USA" the M248B is named "Metrahit PM Prime BT" with "Metrahit Ultra BT" in parenthesis. I am tempted to buy one...
@@Cleofizoid Yes, they renamed it Prime. I doubt you would be able to pull it apart and not void the warranty.
Hi. I am the owner of Metrahit PM XTRA. I ran into a problem with the current measurement. I wanted to measure the current of the LI-ion battery, which is installed in the power bank when charging the smartphone. Until the multimeter switches the range from uA to A, the power bank does not have time to start up. The measurement is unsuccessful. The point is that the internal resistance when measuring uA is large, which causes the power bank to not start up in time. If I manually switch to the A range, the measurement is successful, but it is not comfortable. There is no such problem with older models where there are two measuring holes specifically for measuring mA and A (I have 18S, 24S, 25S, 28S at home). This problem can manifest itself in practice with various measurements. My question is why doesn't the automatic range switch go from A to uA? The problem would be solved.
I have no affiliation with Gossen. You would need to contact them directly to ask questions about their choices for their designs. I suggest being more clear than stating something is not comfortable. If there is a reason you can't use manual ranging, be very clear about why. Personally, I rarely use a meter to directly measure current, partly because of the budged voltage you mention.
Can you please review their new Metrahit PM Prime series? They might send it for free..
Do you have a .PNG image of that lady-demon sticker?
Sorry, I do not. This thing came from the car parts store. Saw it and thought, that's what my transient generator needs!
45:05 That response from Gossen is just so far beyond comprehension. Is this really the kind of response one gets when they ask an honest question on just where an end user of their product can get their metre properly calibrated and aligned?
In this case, it does seem so. I still am not sure if they have companies in the USA that can perform an alignment. In Dranetz's last email, they claimed they could perform both calibration and alignment but personally, I have zero confidence that they even understand the difference or that they could actually align it. Having to ship the meter back to the factory for proper alignment would be a real pain.
And if you did ship it directly to their factory on good faith, I wonder what would be the result? Would it take weeks, possibly months? If and when it's done, would it be done correctly? If not, would they actually take responsibility for a mistake on their end, even if it actually was that very rare 1 in 10 million probability?
I hope my statements aren't worsening yours and other's situations, but I am genuinely concerned.
I really have no idea. I can tell you that Germany wants me to go through Dranetz for all technical requests. That did not pan out so well for the simple stuff. I can't see it going any better for more complex problems.
You should really consider doing DMM reviews after you're finished testing the robustness of the meters. You always manage to find the bugs/quirks with the meters that no other reviewer does, because you test them thoroughly. Do a short summary for each meter, describing good/bad, bugs, likes/dislikes. No other "reviewer" found any the glitches you've found on this meter. They just assumed that it was marvelous because, you know, German, instead of the semi-polished turd that it is... (I'm factoring in the price of the meter in the last statement)
Just a thought.
Normally, once I am done with the robustness testing, the meters are dead beyond repair. It would be difficult to review a dead meter. I did the summary because I had made so many videos of the Metrahit showing so many different problems, I thought it would be good to consolidate them.
joe can u provide the spread sheet link please ?
First post:www.eevblog.com/forum/testgear/hear-kitty-kitty-kitty-nope-not-that-kind-of-cat/
thanks !
No problem. Thread may be of interest to you.