TY720, KEW 1062, handheld multimeter, Inside High resolution images - Page 1
Forum section: electronics / testgear

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 06:15:53 am
content: I finally took all the images inside Kyoritsu KEW1062, which is same as Yokogawa TY720.I also uploaded a video of tear down.https://youtu.be/7u3v8R-L7-IFront side.

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 06:20:14 am
content: next

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 06:20:47 am
content: next

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 06:21:34 am
content: next

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 06:25:23 am
content: next

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 06:28:38 am
content: next

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 06:31:54 am
content: a

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 06:34:13 am
content: Back side

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 06:35:19 am
content: next

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 06:38:51 am
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author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 06:42:40 am
content: a

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 06:43:25 am
content: MCU

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 06:44:42 am
content: a

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 06:47:15 am
content: Analog device2.5 V/3.0 VHigh Precision Reference

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 06:50:21 am
content: I think I finished uploading the images.

author: HKJ
author_rank: Super Contributor
timestamp: April 24, 2018, 06:59:30 am
content: Interesting, no multimeter chipset but implemented with a 24 bit ADC (ADS1240) and a processor.

author: Fungus
author_rank: Super Contributor
timestamp: April 24, 2018, 07:09:02 am
content: Quote from: fanOfeeDIY on April 24, 2018, 06:28:38 amDamn, that's aLOTof ICs.

author: BravoV
author_rank: Super Contributor
timestamp: April 24, 2018, 07:26:28 am
content: Arigatōgozaimasu fanOfeeDIY san.PS : Regarding photos attachment in a single post, you can put up to 25 attachments (max. 2MB total), all you need is just click the tiny words ->(more attachments)when you're attaching photo, its right below the "Browse" button when you're going to select the file you want to upload. Yes, its easy to miss it.

author: BravoV
author_rank: Super Contributor
timestamp: April 24, 2018, 07:34:47 am
content: Quote from: HKJ on April 24, 2018, 06:59:30 amQuote from: Fungus on April 24, 2018, 07:09:02 amI guess this meter is easy to fix as no proprietary chip used ?

author: BravoV
author_rank: Super Contributor
timestamp: April 24, 2018, 07:37:26 am
content: Are those two clear glass neon bulbs like at the right are GDT ?

author: Fungus
author_rank: Super Contributor
timestamp: April 24, 2018, 08:01:41 am
content: Quote from: BravoV on April 24, 2018, 07:37:26 amI'm guessing so, although they're a bit how-you-doing.Some of that hand-soldering is really nasty and those input jacks and current shunt need a bit more solder IMHO.

author: Fungus
author_rank: Super Contributor
timestamp: April 24, 2018, 08:06:51 am
content: Quote from: BravoV on April 24, 2018, 07:34:47 amJust looking at them: There's a whole bunch of 8-bit shift registers. Are they implementing the LCD driver in discrete logic? WTF?Edit: No, they aren't. All the tracks to the LCD connector come from the main chip. What are all the shift registers for, then?

author: HKJ
author_rank: Super Contributor
timestamp: April 24, 2018, 08:11:12 am
content: Quote from: Fungus on April 24, 2018, 08:06:51 amThey must need a lot of I/O's, not only for the LCD (A shift register only works for simple LCD's), but also for the DMM part, there must be lots of MUX's to control for auto ranging and modes.

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 08:30:32 am
content: Quote from: HKJ on April 24, 2018, 06:59:30 amOh, I thought that chip was DMM chipset.I should have took the close up image of it.I have been open up the meter about tree time already from last evening.

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 24, 2018, 08:48:06 am
content: Quote from: BravoV on April 24, 2018, 07:26:28 amAhh, that was the reason for the error message.I tried to make the images to be high resolution and end up making each jpg file slightly less than 1MB,and end up attaching more than three images being caught with warning of the 2MB.So I just started to attach one image at the time.And then the next warning was that I need to wait 30 sec each for next posts.Probably I will compress more and reduce the file size, next time.Thinking to do the same for Hioki DT4282.

author: Fungus
author_rank: Super Contributor
timestamp: April 24, 2018, 08:59:06 am
content: Quote from: fanOfeeDIY on April 24, 2018, 08:48:06 amGo for it!

author: joeqsmith
author_rank: Super Contributor
timestamp: April 24, 2018, 10:55:30 am
content: First, thanks again for taking the time to post these. My first impression was, wow they have a nice shield on both sides of the meter. Gossen could learn from them. Then I thought the meter reminds me of that Keysight meter I ran with all the ICs on it.It looks like they have the basic resistor, PTC then to the GDT with the two GDTs common in the center. I can't tell if that center axial part ties to the common point which wouldn't make much sense. I can't see the return path. If the board is still out of the case, maybe hold it in front of a light so we can see the inner layers more easily.I have not found anything on the tubes they use but I'm guessing the 202 would be a 2KV part. It's difficult to say how it would hold up.There appears to be some plastic from the case on the board.

author: joeqsmith
author_rank: Super Contributor
timestamp: April 24, 2018, 11:07:58 am
content: Just finished watching the video. Did you by chance take any pictures of the wiper contacts?At 6:40, I thought with the two traces routing to the jacks, they were maybe detecting the leads being wrongly inserted which would need the split connectors. Maybe a design prior to adding the shutter.

author: coromonadalix
author_rank: Super Contributor
timestamp: April 24, 2018, 08:42:43 pm
content: I cant understand why they did not use an dedicated dmm front end chiptons of chipe here, the battery life must be ordinary ??and the board is not cleaned after soldering outch

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 30, 2018, 12:20:41 pm
content: Quote from: joeqsmith on April 24, 2018, 11:07:58 amTook pictures.Uploading the wiper contacts.

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 30, 2018, 12:23:46 pm
content: Quote from: joeqsmith on April 24, 2018, 10:55:30 amI tried one with the light from the back.

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 30, 2018, 12:34:04 pm
content: My first impression when I open the case was the same as others.The flux residues are left on the PCB.My knowledge is that the best insulating material is the air,and I worried that the flux would led arching when the transient voltage/current comes in.The DMM itself looks at least six years old by observing the case and contacts,the color of flux is still clear and have not changes to yellow which is normally one of the cause of corrosion.

author: fanOfeeDIY
author_rank: Unknown
timestamp: April 30, 2018, 01:42:29 pm
content: Quote from: joeqsmith on April 24, 2018, 10:55:30 amThanks!I removed it. It was the rubber from the surface of outer of the back case.There are some peeling on the rubber surface of the corner of the case by probably the drops in the past,and I must have put them inside when I open the case.I looked around the case and there were no way that the peeling could go inside the case other than myself.It could have changed the transient test too.

author: joseph nicholas
author_rank: Frequent Contributor
timestamp: April 30, 2018, 02:28:06 pm
content: It kind of looks like the company is reinventing the wheel with this meter, look at how they are doing measurements an calculations. It sure is novel.

author: fanOfeeDIY
author_rank: Unknown
timestamp: May 01, 2018, 10:43:03 am
content: One of the reason I could think of why they have not used any of the DMM chipset could be thatone of the selling point of the TY720/KEW1062 is that it is able to calibrate by any user whohas references.It show the User Calibration Function from page 107 to 111.https://cdn.tmi.yokogawa.com/IMTY720-E.pdf#%5B%7B%22num%22%3A112%2C%22gen%22%3A0%7D%2C%7B%22name%22%3A%22Fit%22%7D%5D

author: coromonadalix
author_rank: Super Contributor
timestamp: May 03, 2018, 02:54:59 am
content: oh ho nice of them to show us how to calibrate it ... picked points here

author: emartine
author_rank: Contributor
timestamp: March 08, 2019, 07:32:34 pm
content: KYORITSU 1062 and YOKOGAWA TY720 are just the same?Arent they both different companies?Are they really MADE in Japan? Or built in China?Thanks.

author: Fungus
author_rank: Super Contributor
timestamp: March 08, 2019, 08:26:56 pm
content: Quote from: emartine on March 08, 2019, 07:32:34 pmRebranding of meters by different companies happensall the timein the multimeter world.

author: sambonator
author_rank: Regular Contributor
timestamp: March 08, 2019, 08:34:12 pm
content: Quote from: Fungus on March 08, 2019, 08:26:56 pmTEquipment lists this multimeter's Country of Origin to be Thailand.

author: helius
author_rank: Super Contributor
timestamp: March 08, 2019, 10:56:22 pm
content: The Yokogawa meters are marked "Made in Japan". They are the OEM for Iwatsu (VOAC22) and Kyoritsu (KEW 1062), although those rebadged meters do not seem to have the simultaneous AC/DC display mode marked. Mine has the solder residues as well.

author: fanOfeeDIY
author_rank: Unknown
timestamp: March 09, 2019, 01:48:39 am
content: joe smith have uploaded excellent review video on TY720.The first one is one and half hours long. It gave me enjoyment of three days last week to finish watching it.

author: joeqsmith
author_rank: Super Contributor
timestamp: March 09, 2019, 02:15:11 am
content: Quote from: fanOfeeDIY on March 09, 2019, 01:48:39 amThat is dedication. Glad you enjoyed them. Now, after seeing the Yokogawa punished, are you going to send me your high end Hioki?

author: fanOfeeDIY
author_rank: Unknown
timestamp: March 09, 2019, 03:32:03 pm
content: Quote from: joeqsmith on March 09, 2019, 02:15:11 amThe damage from your thorough robustness test would be a story it would be passed for generations in my families

author: windsmurf
author_rank: Frequent Contributor
timestamp: March 10, 2019, 10:18:33 pm
content: Quote from: fanOfeeDIY on March 09, 2019, 03:32:03 pmSo when can we expect Joe to forge for you your family heirloom?