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UNI-T UT61E Multimeter teardown photos.

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Nawual:
After i have read 41 pages...ummm...where can i buy the versión gs with a good price?.Thanks

Rango:

--- Quote from: SeanB on April 18, 2016, 06:29:53 pm ---Slap the 3 low capacitance MOV units in, and be done with it. The limiting factor will be the PTC in any case, 1kV and it will fry itself apart in a second or so. Choose the voltage to suit your normal use, and as they mostly come from RS in packs of 10 you will have some spares. If you do blow them up the meter will not survive in any case.

In my case I just used 2 275V MOV units ( 7mm) in series, as I did have the remains of a 10 pack around, so using the 6 was easier than either placing an order and wait till I had the minimum order price in other parts, or paying the $20 courier charge RS puts on here for small orders. Still have 1 left, after replacing 3 MOV units on other equipment.

--- End quote ---

@SeanB so reading threw last 20 pages i gathered that slapping those 3 movs it would increased chances of input protection. Why 3 not 4 or 2? Which spots GS1 threw GS4 ? If only 2 then which spots? Wouldn't this 30pF Vishay Vishay VDRS - E Series Metal Oxide Varistor 30pF 5A, Clamping 1200V, Varistor 750V (178-059) be best option as it has lowest capacitance rating hence not throwing up capacitance rating too much out of calibration on 61e when measuring capacitance as compared to other once listed below? Would this affect any other measurement readings and to what degree will it effect capacitance rating? Also those come in pack of 5 so would also be ideal unlike pack of 10?

Does anyone know what those original green Mov's part numbers are on GS version PCB or would those movs listed below be better since their rating is higher for voltage? What about fuses replacement/upgrade/Siba? Would that effect mA readings for example?

It seems latest PCB versions of 61e are same as GS so it looks like installing those Movs would make this GS DMM minus 10A trimmer? Why is that trimmer missing and what effect having the trimmer in CHI version have with those movs do?

"it seems that the PCB is the same between the world-wide and German versions today, but I've not been able to verify that - the photos I've seen of the German PCB seem to be missing the 10A trimmer (by the 10A fuse, between the input sockets), amongst other differences.

There are a lot of beefy SMT diodes, which I presume are also for protection. We have a single IR LED for the PC interface, with a 4069 CMOS hex inverter next to it. Under the screen is the divider resistor network - I've not removed the screen to investigate further, but it appears to be encapsulated in plastic, so I can't tell if it's a nice thick-film network like Fluke use (as if it would be!). As with the UT210E, the crystal is 3.999MHz rather than the usual 4MHz."

https://www.markhennessy.co.uk/budget_multimeters/unit_ut61e.htm

If anyone else would like to jump in and help me out that would be greatly appreciated.

Any other Parts besides green movs that appear on GS PCB board that could be modded into CHI PCB board to reflect original GS design?

Here are the mov parts i gathered that can be used in GS1-GS4 spots

http://uk.rs-online.com/web/p/metal-oxide-varistors/0178059/?searchTerm=178059&relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D626572266C753D656E266D6D3D6D61746368616C6C26706D3D5E5C647B362C377D7C5C647B31307D7C28283F69292852537C5253207C52532D293F5C647B337D285C73293F5B5C732D2F255C2E2C5D285C73293F5C647B332C347D292426706F3D3126736E3D592673743D52535F53544F434B5F4E554D4245522677633D4E4F4E45267573743D313738303539267374613D3031373830353926

https://www.mouser.com/ProductDetail/Bourns/MOV-07D681K/?qs=lgttKnAd%252b2CCDLVYA77ICw%3D%3D

http://uk.rs-online.com/web/p/metal-oxide-varistors/7606964/?searchTerm=7606964&relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D626572266C753D656E266D6D3D6D61746368616C6C26706D3D5E5C647B362C377D7C5C647B31307D7C28283F69292852537C5253207C52532D293F5C647B337D285C73293F5B5C732D2F255C2E2C5D285C73293F5C647B332C347D292426706F3D3126736E3D592673743D52535F53544F434B5F4E554D4245522677633D4E4F4E45267573743D37363036393634267374613D3736303639363426

http://uk.rs-online.com/web/p/metal-oxide-varistors/7118149/?searchTerm=7118149&relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D626572266C753D656E266D6D3D6D61746368616C6C26706D3D5E5C647B362C377D7C5C647B31307D7C28283F69292852537C5253207C52532D293F5C647B337D285C73293F5B5C732D2F255C2E2C5D285C73293F5C647B332C347D292426706F3D3126736E3D592673743D52535F53544F434B5F4E554D4245522677633D4E4F4E45267573743D37313138313439267374613D3731313831343926

http://uk.rs-online.com/web/p/metal-oxide-varistors/2897109/?searchTerm=2897109&relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D626572266C753D656E266D6D3D6D61746368616C6C26706D3D5E5C647B362C377D7C5C647B31307D7C28283F69292852537C5253207C52532D293F5C647B337D285C73293F5B5C732D2F255C2E2C5D285C73293F5C647B332C347D292426706F3D3126736E3D592673743D52535F53544F434B5F4E554D4245522677633D4E4F4E45267573743D32383937313039267374613D3238393731303926

This one does not state capacity rating anywhere
https://www.tme.eu/gb/details/siov-s20k625/tht-varistors/epcos/b72220s0621k101/

Here is an idea how about we open up fund me page for joe smith and each of us fund few $ to buy 61e and just add movs and put it threw his test without any other board modifications (cutting pcb lines and other stuff he did)? That way we know if it survives input protection of not and no one has to sacrifice it's meter and cost to each of us would be $2-4. 

Pic attached Not mine UT61e GS PCB board

Rango:

--- Quote from: joeqsmith on September 01, 2016, 01:07:59 am ---I picked up a brand new UT61E.   It appears identical to the one 5KY had sent.   Metal can and all.   

So, what I would like to do if modify this meter with the MOVs people are recommending, or use the parts that are available in the one being supplied to Germany.   I will then retest it to failure and see if there are any improvements. 

Keep in mind the 61E and D never made it to the mini surge test.  They both failed ESD with that little grill starter.

--- End quote ---

@joesmith did you ever mod chi 61e with only movs seen in GS version (which btw is also same movs as in your 181A i think) to see if it survived ESD test and maybe up 1000V test? Basically that would be my goal with movs and fuses upgrade. I'm not sure why 1000v fuses are so damn expensive. It's just a wire inside isn't?

I see Holdpeak 35$ meter pretty much survived almost all of your test. Makes you go hmmm.

racemaniac:
I recently also received a UT61E from china, seems like a fun device.
bought it since i wanted something basic that could log data.

One issue i had with mine when it arrived was a few segments of the LCD not lighting up properly (you could only see them light up when looking at an angle) (which luckily meant the signal was there, and the segments weren't broken :) ).
Googled a bit and found videos of people cleaning the pads on fluke multimeter pcb's that connect to the lcd. Opened up my ut61e, and i saw the same style of pads, and a few were very clearly dirty, cleaned them up with a q-tip with some acetone on it, and the lcd is now showing perfectly :).

Nisei:
GS model and regular model next to eachother.

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