The YOKOGAWA TY720 DMM
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- Опубликовано: 26 авг 2024
- A few people have asked me to look at Yokogawa. I am familiar with their strip chart recorders but havn't used any of their handheld DMMs. How will their top of the line flag ship product compare with the other meters I have looked at? Watch and find out.
Feel free to join the thread:
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An old video explaining the transients I apply:
• Programmable Transient...
The data for the meters I have tested may be found here: docs.google.co...
Answers to Frequently Asked Questions may be found here: docs.google.co...
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It always bewilders me how an expensive product can have such a woeful LCD display when a $10 meter gets it right.
I think it may be the worse display I have seen yet on a handheld meter.
@TMM
I was about to write exactly what you said. Especially with today's available display technology. It makes me wonder if it couldn't be a defective unit perhaps ? I can't imagine a company designing an expensive DMM with such a poor quality display ? Moreover, holy smokes, there's a lot of ICs in this thing ! Hasn't Yokogawa ever heard of a FPGA ?
joe smith
It could be poor zebra strips. Try cleaning each edge with IPA, and the PCB and LCD contact.
@@AlainHubert I believe it. Lol
A lot of those chips are probably analogue (opamps) and signal muxes / cmos logic. They are cheap, probably cheaper than an FPGA/CPLD/uC that could replace them. If you're designing a multimeter to sell for the next 20 years you also don't want to design in some flavour of the week IC that will be unobtainable in 5 years. That often results in one custom multimeter IC or well supported uC, plus a bunch of jellybean parts. The japanese also seem to be strongly opposed to using non-japanese produced ICs, so if they aren't willing to use a Chinese/Taiwanese multimeter-on-a-chip IC or spin their own custom IC you end up with a very dense design like this. I also suspect this design is already very outdated and even if they could consolidate a few chips it isn't worth the re-engineering expense.
So much time and effort poured in. I bet a few professional multimeter companies pay close attention to your testing.
It's a pretty small channel and doesn't get a lot of traffic but you never know.
I've just found one of those in a very good price (brand new, with optics and USB cables included) for about USD 180 (converted to USD), and I felt tempted to buy it. But the display and that DC measurement bug seems a huge deal breaker. I wonder how Yokogawa, that has such great wattmeters and fair decend scopes could let those flaws on a flagship multimeter.
Thanks a lot for the review, John. Great job once again. I only missed the rotary switch test (because my two current multimeters suffers - a lot- from rotary switch wear).
I have seen a few handheld meter's switches fail.
Greetings. Great video. Just to clarify something at 5:40. The LP ohms Is not lowpass filter ohms function. It Is Low Power Ohms function. When measuring resistance, the current could affect the ohmic value of the specimen. So, the approach of Yokogawa (or Kyoritsu) Is to test with less current. Also, this meter has either average rectification (MEAN Button) or true-rms to measure AC Volts, though I don't know exactly why an eagle would fly like a pigeon.
If you look carefully at my videos, I would guess there are at least a few mistakes on each of them. In this case, LP is a very common acronym I use but of course, you are correct that they use it for something other than this. The manual suggests it is for in-circuit measurements but they don't elaborate on it. Possibly there was a concern about damaging other sensitive components.
Awesome work Joe!
I did eventually repair the meter. ruclips.net/video/Q9JhJm_dTPM/видео.html
Someone also asked about the settling times and I ended up comparing the results prior to damaging the meter and after repairs. The video was overlaid and you can see how it compares. ruclips.net/video/FNU_G77rRQ0/видео.html
Price second hand in v-good condition is about $80 - $120 here in Japan.
Thanks for posting this Joe looks interesting!
Regarding solvent susceptibility of the display window, I've found that of all things, isopropanol causes hazing on my old Fluke 77. One would think that IPA would be utterly common and fairly benign. It's not as aggressive as toluene/acetone/MEK would be on an acrylic, but it's enough to leave white spots if it gets spattered on the meter. It's mild enough that you can use a rag lightly dampened with IPA as a solvent polish like one would on acetate. Just keep buffing until all the solvent has evaporated
That said, I'm talking about a nearly 30 year old product. There's nothing to suggest anybody uses the same materials anymore.
Thank you for the great thorough review! Some other is commenting that if I have sent the TY720 to Joe but no. I have mine at home and Joe have bought one by his own. The dim LCD, dim LCD light, would like to be revised in the future model. And more durable jack and cleaner PCB. Manufacturing quality seems to be good, Hoping for improvements in the future. The video makes me to buy Bryman:)
Hey, you finally get to see how the meter held up. You can also see why I didn't take you up on your offer. You would end up with a damaged meter.
The meter is fairly old. Do you really think they would offer an improved version? I would think it was close to it's end of life.
@@joesmith-je3tq I also felt the model is going to end of life and felt the next model would come up, so I thought it would be a change to input your evaluation for the next model but I do not have any communication channel to the company at the moment. By the way, any kind of the damage by your robustness test would be only be a score or reward :)
It is a multimeter with a very nice visual appearance, aesthetically you can see that the Japanese thought a lot about it (not like the Chinese who look more like a transformer than a multimeter), but it is a real shame that its screen has a really bad reflective film, making a poor contrast and bad visualization. I hope they improve this in the future.
If that display is anywhere near as bad in person it's a deal breaker for me. My handheld meters are pretty much always used in less than ideal positions (if I'm at my bench I'm using my bench meter.) And a good high contrast display is pretty much the most important thing to me.
I don't understand how they can sell this DMM for 600 USD and who's going to to buy it. I've seen some other meters looking exactly as same as this one (I have feeling it a re-badged).
Thanks for the video and the time and your efforts.
Hi Joe, This is the same Kjoritsu 1061 or 1062 meter rebadged by yokogawa.The difference is the green kyoritsu color. I agree about the miserable display and the very slow capacitance and ohm range. Lovely review!
When Akira asked me about it, he had purchased one of each and reviewed them together. I want a meter to display the correct voltage when applied, especially once I get over 40V! As bad as the display is, that one problem is a deal breaker for me.
ruclips.net/video/7u3v8R-L7-I/видео.html
@@joesmith-je3tq The display in my case is a big disappointment... as is the lag mentioned above. I do not have any incorrect voltage measurements above 40v. Might be a calibration issue. My meter came with a calibration certificate for all ranges from the factory and is spot on, just like my brymen 869 and fluke 87v
@@billywhizzySo you have one of these. If you watched this entire video, you have seen where the meter can't read below or above 40V. There wasn't anything magical about that number except from a risk standpoint. If you inject signals as I have shown, you claim yours read correctly? Or are you not understanding what I am injecting into the meter? I would be interested in knowing if your meter does have this same bug. I say bug because obviously this meter is cal.
@@joesmith-je3tq I'll try it when i get back home in auto ranging.
@@billywhizzy The ACmV will have a range where it works, then over ranges, then starts reading a false value. With the DCV I've ran into this problem with cheap meters. If you have problems replicating my results, just let me know what you have available for equipment and I can try and walk you through a simple test case.
Great Video. What a wast of money. Thanks Joe
I bought a used TY720 but doesn't have the DC60V problem. Mine has yellow body which should be an older model.
AD780AN is the correct part # for that bandgap reference. Roughly similar to LT1019...-2.5.
Could you please do a review of the Southwire 14070T multimeter. I can't find an in depth review of this meter and I'm very interested in its quality
It's a rebranded CEM. Extech also uses CEM. I've looked at a few of their products and have used one for the past several years. In my experience, the quality has been hit and miss. For a 6000 count meter, the $100 seems steep.
Thank you, Joe. Great review. Flux residue on the board of this multimeter is a real surprise. Brymen looks like a winner
All those jump cuts aggravates my motion sickness.
Simple fix, close your eyes.
The LCD is so bad you should try to improve it. There must be a contrast pin on it right? Is the operating voltage correct?
Without the schematics, I can't see wasting too much time attempting to track down the damaged component, let alone trying to sort out why the display is so poor.
Excelent man , good test. I need one multimeter Yokogama
Yokogama? Is that one of those nuclear powered handhelds I have been reading about?? lol.
Gostei deste banco de testes feito por você. Tem vídeo sobre ele?
ruclips.net/video/-yIKw0YGpHk/видео.html
ruclips.net/video/1wD7Q1N1XY4/видео.html
Thanks Joe! I am surprised that the Fluke 87V isn't in the row of meters.
Never mind, I watched the video.
Yea, it's a basic 6000 count meter for the electricians and techs. A bit out of its class.
I bought the 87V-E2 for $400 brand new in 2014 and it has been a good one. It is always spot on. Though my BM869s is my favorite meter. But it took some time before I trusted it with mains power. I use Probe Master probes with both of them.
@@robertcalkjr.8325 I have been looking at the long term drift of that low cost UT61E I show in the line up. As expected, it too has been very stable. I also have an old CEM meter that I have shown from time to time that is six years old. It's not in the best physical shape but still passes calibration. If it ever falls out, I will get a new meter.
joe smith I try to be careful with my tools and my meters still look brand new.
Could you please do a review of the Megger AVO835 meter. it looks very unique in its functionality and I suspect its made by the same company
Watched a few videos on it. It appears the analog display updates at the normal rate. Downloaded the manual for it. They don't seem to specify the update rate. I could not find where the meter was certified to pass the IEC standards. What features do you feel makes it unique enough to spend any time on?
I really wanted to like this meter, turned out such a disappointment, i was expecting awesome Japanese electronic engineering at that price!
👍nice
The display and the switch are a fail in this otherwise nice meter.
I was wondering what are you thoughts on 140 series multimeters by Southwire... People on forums are giving me guff saying it's trash.
I've looked at a Southwire which was a rebranded CEM. There was a CEM in the lineup. What's the part number?
Should ask Brymen if they will send you a 867s for testing.
I've looked at a lot of Brymen products and they have all performed well. I have no reason to believe the 867s would be any different.
yokogawa ang kyoritsu shared the same o.e.m back then. made in taiwan.
Did you got in touch with a Sanwa DMM ?. Regards.
I never tried to contact them.
Have you ever looked at the Metrix range? Their MTX3293 specs are great on paper...
There is a link in the description to all of the data I have collected from the meters. You will find every meter I have looked at.
I know you haven't tested them, I was wondering if you've ever even considered them for purchase.
@@johnalexander2349 No
Hello, is there any chance that You will test in future Keysight DMMs from series 1250 or 1270?
I doubt it for a few reasons. I had tried to contact Keysight and they never responded. Seeing that glass filled detent spring crack all four prongs after a few cycles. The meter I looked at just wasn't very robust.
Thank you for your response. I am also concerned about the robustness of these multimeters, but considering the fact of popularity these series I'm curious how they compare to BM869s. Greetings
Good Video!!
Meter eater strikes again.
Seems like a pretty bad meter for the price joe.Gee, tough swallow.
Appreciate the videos btw!
Agree. The Gossen was a higher cost, had BT and was not damaged. Then again, it has other problems that I would have NEVER guessed a Gossen branded meter would considering all the hype I have seen on them. But that's why I run these tests and make them available. You get to see first hand how they perform against other meters.
@@joesmith-je3tq Than you so much.
jesus so slow in capacitors :P it needs yokohama tires to run faster. its a difference of a letter and one inverted. A defective SIBA fuse? maybe breaked on the one of the end of the cap due to vibration, shipping? Big fail on the auto-range when measuring HV with AC plus DC bias :S for that kind of meter
Once again,,,, Byrmen stands out in front! The one thing that really shocks me the most about this Yokogawa is how piss poor the display is. You would think that a top of the line meter would have a much better display.
Yes, at least for me it's still the best suited meter.
@@joesmith-je3tq And is my go to meter as well!!
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