Just tested it. AUTO DC+AC mode and I supplied about 25Vdc and it hunts. Raised voltage to about 44Vdc and it reads correctly. Lowering the DC voltage and it hunts again.
It looks like all pre-production errors are still present in the first batch of production meters of the 121GW. Even my crappy UNI-T UT71E is doing a better job in all of the discussed bugs.
I like to hear something soon from Dave how they will go on with the production meters of the early adopters...
Are you both using the same firmware?
The pre-production meter would lock in depending on the AC and DC components. If you have a cheap power supply with a lot of ripple for example, the meter may actually read correctly.
V1.02 original (no autoranging patch)Strange. You would think it would do it or it wouldn't. I am not sure what sort of regression testing is being ran on the patched code. Maybe the patch has something to do with it.
Isn't one of the selling points is that it can be turned with one hand?
So far no one has said that if there was no wobble, if it could or not be used with one hand.
If so, probably only after Dave realised early on that is was never going to be as stiff as the BM235 (which was a selling point about how stiff it was, and any shootout would get extra point for stiffness), and quickly turned a negative into a positive. I think we underestimate how good he is at the marketing, and his own down playing of this skill, is a key part. I would bet, if he could have got them to make it as stiff, he would have.
I am having problems with connecting the 121GW app from dave2. I did no get any data shown in the app up to now. Most time it even does not connect.
I first run bluetooth and connect to the 121GW then I start the app. Sometimes when I click on refresh I can see the 121GW. Only one time it was able to connect (but no data shown, only white screen). Most time it says "connecting..." but never does.
The other app "EEVBlog 121GW" sometimes connects successfully and shows some values but sorry, it's so ugly.
/EDIT:
Now I got it running for one time but I think I am missing some data on the screen?
Well it was not a cheap power supply at 500€ but will try with a 9V battery then later. I’ve so far not se3n what you show in your viceo. Anyone else?
Just want to add that rotary switch wobble issue exists also with my meter (EU shipped). https://youtu.be/pjaWWMoPMsE
Is this same for everyone or only part of the already shipped meters?
Hi Joe, I just tried it and can not replay your issue in the video. 10Vpp sine-wave from the Siglent SDG 2042X into the 121GW and the BM869s connected too. This 121GW on any ms range indicates correctly at frequencies from 10Hz to 200Hz (10, 50, 100, 200). I can not get a wrong reading on the meter. Still on V1.02 not patched for slow update rate.Well it was not a cheap power supply at 500€ but will try with a 9V battery then later. I’ve so far not se3n what you show in your viceo. Anyone else?
Hi Joe, tried a 9v (actually bit dated and went to 8v) battery. Apart from slow auto-ranging no issue on locking in. So if slow auto-ranging is hunting then yes but I assume not.9V I assume was for the AC+DC mode. If you read the previous posts, looks like the reason for the difference was indeed the patch. It appears they did address a few of the problems. I think the big one is what appears to be a metallic dust in those previous pictures. If you have been putting a few cycles on yours (even a few hundred total) and a camera that you can take some close ups of the pad area, it would be interesting to see a few more pictures.
Hi Joe, I just tried it and can not replay your issue in the video. 10Vpp sine-wave from the Siglent SDG 2042X into the 121GW and the BM869s connected too. This 121GW on any ms range indicates correctly at frequencies from 10Hz to 200Hz (10, 50, 100, 200). I can not get a wrong reading on the meter. Still on V1.02 not patched for slow update rate.Well it was not a cheap power supply at 500€ but will try with a 9V battery then later. I’ve so far not se3n what you show in your viceo. Anyone else?
Hi Joe, tried a 9v (actually bit dated and went to 8v) battery. Apart from slow auto-ranging no issue on locking in. So if slow auto-ranging is hunting then yes but I assume not.9V I assume was for the AC+DC mode. If you read the previous posts, looks like the reason for the difference was indeed the patch. It appears they did address a few of the problems. I think the big one is what appears to be a metallic dust in those previous pictures. If you have been putting a few cycles on yours (even a few hundred total) and a camera that you can take some close ups of the pad area, it would be interesting to see a few more pictures.
Hi Joe, I'll give that a go the coming days. Too much normal work going on for me at the moment. I'm not sure I'm looking forward to this to be honest. If the tracks are or seem to deteriorate quickly I would be appalled. Are you getting an official, non pre-production, 121GW soon perhaps?Personally, I would rather know if there was a problem early on. If there is, maybe it could be corrected before any major damage happens to the PCB. What sort of warranty did you get? If you put a few thousand cycles on the switch over the next few weeks and the parts are damaged, is the meter covered?
From what I understand, very few meters made it to people in the USA so even if I had joined, I doubt I would have it. Strange as I would have thought they would have been the largest consumer. Anyway, I was concerned that there had not been a full review of the meter that disclosed what the problems were and how they would be mitigated. Obviously, there were problems that have been known for some time. I had asked a question in the kickstarter that went unanswered. Also, looking at the closeup video, it appeared the meter's weak front end was still in play. Again, it's not a lot of money but if I bought one it would be to run it to failure and I did not want to invest this amount of time if the design was still not stable or if it was not going to be an improvement over the earlier version. If and when it looks like the meter is stable and it becomes available through normal channels, I may run one. For now, it seems it is way too early.
....Keysight U1461A .... goes from infidelity to zero ohms in just 2.2-2.4 sec
....Keysight U1461A .... goes from infidelity to zero ohms in just 2.2-2.4 sec
HA! I thought infidelity was already due to low resistance
From what I understand, very few meters made it to people in the USA so even if I had joined, I doubt I would have it. Strange as I would have thought they would have been the largest consumer.
From what I understand, very few meters made it to people in the USA so even if I had joined, I doubt I would have it. Strange as I would have thought they would have been the largest consumer.
Probably the large time difference between USA and Australia caused potential consumers to be too late in the game - at least for the first batch anyway.
Look at the data. There are several meters that have done very well in these tests. 2KV is lower than the average and not something I would be impressed with. I was just as surprised by the Fluke 87V result. Received a lot of negative posts over that one from the fans. Not much I can say about how the meter's do in the tests. I can say that the Fluke 87V is not what I consider the goal post.
Perhaps sniffing the bus on how U1461A controls the hy3131 could give an idea how it achieves this speed. But if we're unlucky there are other HW differences that makes the 121gw so dreadfully slow.
Perhaps sniffing the bus on how U1461A controls the hy3131 could give an idea how it achieves this speed. But if we're unlucky there are other HW differences that makes the 121gw so dreadfully slow.
FYI, the 121GW is now on par with the U1282A.
Look at the data. There are several meters that have done very well in these tests. 2KV is lower than the average and not something I would be impressed with. I was just as surprised by the Fluke 87V result. Received a lot of negative posts over that one from the fans. Not much I can say about how the meter's do in the tests. I can say that the Fluke 87V is not what I consider the goal post.
I guess this goes to show how important this stuff actually is in the real world, as much as we all like to fuss over these sorts of details because, you know, we are nerds.
I have never heard a single person complain that the Fluke 87 series isn't a robust industrial meter, and not surprising because it's been an industry standard for like 30 years now.
Look at the data. There are several meters that have done very well in these tests. 2KV is lower than the average and not something I would be impressed with. I was just as surprised by the Fluke 87V result. Received a lot of negative posts over that one from the fans. Not much I can say about how the meter's do in the tests. I can say that the Fluke 87V is not what I consider the goal post.
I guess this goes to show how important this stuff actually is in the real world, as much as we all like to fuss over these sorts of details because, you know, we are nerds.
I have never heard a single person complain that the Fluke 87 series isn't a robust industrial meter, and not surprising because it's been an industry standard for like 30 years now.As I have mentioned before, I really don't know what the failure rate is for the 87V. I've seen posts where they have failed which is not too surprising. Enough hype and marketing can easily cover up any short comings.
Perhaps sniffing the bus on how U1461A controls the hy3131 could give an idea how it achieves this speed. But if we're unlucky there are other HW differences that makes the 121gw so dreadfully slow.
FYI, the 121GW is now on par with the U1282A.
Perhaps sniffing the bus on how U1461A controls the hy3131 could give an idea how it achieves this speed. But if we're unlucky there are other HW differences that makes the 121gw so dreadfully slow.
FYI, the 121GW is now on par with the U1282A.
FYI, that still makes it dreadfully slow - I’m sorry, but I guess I miss the old clonk-clonk-clonk Dave who’d facepalme and hammer his failbutton through the desk if confronted with an auto-ranging this slow on a DMM in this class. But still I really do appreciate what you’re trying to provide with the 121gw and my main point was that the U1461 was so much faster in a 6000 count mode.
Am I expecting UEi to provide a fast 5000 count mode for 121gw? - no not really - but they’re in a much better position having the FW source code to make an addition like that - compared to hacking/patching the binaries. But I’m starting to wonder if UEi them self is limited in what they can achieve with the development tools they’re using. Else I can’t really understand why 121gw ever was released with an auto-raging that was so slow that backers would go seriously WTF!