Author Topic: UNI-T UT61E Multimeter teardown photos.  (Read 534647 times)

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Offline Lightages

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #425 on: November 06, 2012, 12:34:52 pm »
If you need to pay more than $60 for a UT61E, it doesn't look as good. It isn't worth that price unless you need the PC connection and at that it is still not a great buy. Without back light and auto power off it doesn't compete at $90 when you can get an Amprobe AM270 for the same price which has much better input protection, back light, auto power off, and basically the same accuracy. The UT61E does have 22000 count though instead of 5000.
 

Offline T4P

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Offline PedroDaGr8

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The very existence of flamethrowers proves that some time, somewhere, someone said to themselves, "You know, I want to set those people over there on fire, but I'm just not close enough to get the job done." -George Carlin
 

Offline Rick

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #428 on: November 06, 2012, 07:47:19 pm »
Of course not.
Just stick to DX
http://dx.com/p/ut61e-2-6-lcd-digital-multimeter-red-black-1-x-9v-6f22-battery-113306?item=2

Or AliExpress http://www.aliexpress.com/item/UNI-T...548923745.html ($51 shipped to the USA).

If you buy from China, buy from Hong Kong. Shipping from there is way faster and you can track it better. I have just realized that.
I shall try to work with HK sellers as much as possible from now on.
 

Offline dimitrioptimus

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #429 on: November 13, 2012, 02:21:28 pm »
Happy Diwali to all :)
 

Offline PedroDaGr8

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #430 on: November 13, 2012, 06:44:21 pm »
Happy Diwali to all :)

Not quite sure why you posted that in here but happy Diwali mate! ;D
The very existence of flamethrowers proves that some time, somewhere, someone said to themselves, "You know, I want to set those people over there on fire, but I'm just not close enough to get the job done." -George Carlin
 

Offline SeanB

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #431 on: November 13, 2012, 06:58:56 pm »
Festival of loud bangs..........

Started on 1 Nov and will continue till Dec.
 

Online bitwelder

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #432 on: November 18, 2012, 09:35:30 am »
Do you think it would be possible (and make sense) to fix/upgrade the input section of this meter, e.g. by replacing the split input jacks with solid ones, and perhaps adding some MOVs or other protections ?
 

Offline T4P

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #433 on: November 18, 2012, 09:59:35 am »
Why do you need to "upgrade" the split jacks? They work fine for what they are.
MOVs into the Gas discharge tubes footprint is a good idea if i remember that's what monkeh did
As well as the fairly obvious one is to upgrade the fuses. I am getting a box of 6.3x32 1000V siba 30-50kA fuses for 500mA and 10A (Clearly for my upcoming MS8218, 500V for the FF10A) as well as 10x38 Siba 30kA (the ones agilent uses) 1000V for 10A
Odd that a smaller fuse has a much higher breaking capacity rating at the same voltage while being cheaper
« Last Edit: November 18, 2012, 10:10:47 am by T4P »
 

Offline dimitrioptimus

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #434 on: November 21, 2012, 11:26:17 am »
Apparently there is no problem in my 61E,but after opening it I found that there are loads of non shiny surface,so if I heat the solder points and apply rosin,could it be  be better for accuracy or can it hamper the calibration ?
 

Online Fraser

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #435 on: November 21, 2012, 05:07:58 pm »
Welcome to the horror that unleaded solder is !  ;)

Unleaded solder can look very dull and almost a 'dry joint' in its appearance. I still use 2% silver loaded leaded 60/40 solder and always have nice shiny joints. Don't worry about the dull look in your meter, it is normal unleaded ROHS compliant (read 'crap') solder and should be OK. Rosin will not help as teh solder is the problem not the flux.

Kind Regards

Fraser
 

Online Monkeh

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #436 on: November 21, 2012, 05:10:23 pm »
It ain't 60/40 if it's got 2% silver in it!
 

Offline T4P

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #437 on: November 21, 2012, 05:40:48 pm »
Welcome to the horror that unleaded solder is !  ;)

Unleaded solder can look very dull and almost a 'dry joint' in its appearance. I still use 2% silver loaded leaded 60/40 solder and always have nice shiny joints. Don't worry about the dull look in your meter, it is normal unleaded ROHS compliant (read 'crap') solder and should be OK. Rosin will not help as teh solder is the problem not the flux.

Kind Regards

Fraser
Hey there mate! Been some time since i've seen you around, there's a new lead-free out there that could be considered though, it's Sn42Bi58 and if i remember it's melting point is 138C  >:D
 

Offline nukie

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #438 on: November 22, 2012, 01:33:19 pm »
You don't need silver in 60/40 solder for a shiny joint. Quality solder manufactured from high purity material coupled with proper flux makes shiny mirror joints.

 

Offline torr032

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #439 on: November 22, 2012, 03:10:08 pm »
My 61E arrived today.

In the manual I see warning: "To avoid personal harm, do not attempt to input higher than 30V rms tested frequency voltage."

I want to ask can I measure frequency of the 220V wall outlet?
I'm confused here.

 

Online Monkeh

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #440 on: November 22, 2012, 03:12:35 pm »
My 61E arrived today.

In the manual I see warning: "To avoid personal harm, do not attempt to input higher than 30V rms tested frequency voltage."

I want to ask can I measure frequency of the 220V wall outlet?
I'm confused here.

Yes, press the yellow button while in VAC.

I really don't see why people want to measure that all the time though.
 

Offline Salas

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #441 on: November 22, 2012, 03:54:50 pm »
It had successfully measured that the 1kHz/1MHz probe test outlet in my Hameg HM204-2 vintage scope had drifted to 1.16MHz with UT61E in Hz mode (2Vpp test outlet). I was sure I had adjusted the horizontal to proper cal along with the vertical when I got that scope broken years ago from Epay and fixed it, but the test signal it looked bit narrow on screen now. Then the same 1.16MHz was verified on the Rigol. So its Hz function is reliable enough I think. I was ready to open the beast again and dive in but a handy check with that meter gave me the right clue.
 

Offline SeanB

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #442 on: November 22, 2012, 03:59:22 pm »
Only time will be with a cheap genset when you want to see what the frequency is because it is unstable.
 

Offline Salas

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #443 on: November 22, 2012, 04:26:59 pm »
Only time will be with a cheap genset when you want to see what the frequency is because it is unstable.

Just run a quick test. Can follow my gen well in Hz mode at 200mV RMS (high Z ampl=displayed X2). It loses it beyond 460kHz if in ACV yellow shift Hz mode. 50kHz if signal is 50mV RMS.
 

Offline Salas

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #444 on: November 22, 2012, 04:35:23 pm »
So the Hz mode advantage is it is more sensitive in lower amplitudes. ACV Hz mode needs significantly more signal level to keep track progressively as the frequency goes up. But it can take more than 30V AC.
 

Offline torr032

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #445 on: November 22, 2012, 04:38:15 pm »
My 61E arrived today.

In the manual I see warning: "To avoid personal harm, do not attempt to input higher than 30V rms tested frequency voltage."

I want to ask can I measure frequency of the 220V wall outlet?
I'm confused here.

Yes, press the yellow button while in VAC.

I really don't see why people want to measure that all the time though.

Can I also turn the knob to Hz/% position and then also test the wall outlet frequency? Will it do any harm to the instrument?
« Last Edit: November 22, 2012, 04:39:50 pm by torr032 »
 

Online Monkeh

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #446 on: November 22, 2012, 04:51:29 pm »
My 61E arrived today.

In the manual I see warning: "To avoid personal harm, do not attempt to input higher than 30V rms tested frequency voltage."

I want to ask can I measure frequency of the 220V wall outlet?
I'm confused here.

Yes, press the yellow button while in VAC.

I really don't see why people want to measure that all the time though.

Can I also turn the knob to Hz/% position and then also test the wall outlet frequency? Will it do any harm to the instrument?

I believe the manual answered your question already.

Why do you even want to check the mains frequency? I assure you, it's not going anywhere.
« Last Edit: November 22, 2012, 04:53:42 pm by Monkeh »
 

Offline torr032

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #447 on: November 22, 2012, 05:04:18 pm »

Can I also turn the knob to Hz/% position and then also test the wall outlet frequency? Will it do any harm to the instrument?

I believe the manual answered your question already.

Why do you even want to check the mains frequency? I assure you, it's not going anywhere.
[/quote]

I don't know really , just for the info. I turned the knob to Hz/% and into the AC mains, just for the split of a second and there was some fast beep sound from the instrument and i disconent it immediately. He appairs to work normal, on the V switch is showing 50Hz.  Is it protected for the case of a misusing? 
 

Offline torr032

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #448 on: November 22, 2012, 05:05:57 pm »

Can I also turn the knob to Hz/% position and then also test the wall outlet frequency? Will it do any harm to the instrument?

I believe the manual answered your question already.

Why do you even want to check the mains frequency? I assure you, it's not going anywhere.

I don't know really , just for the info. I turned the knob to Hz/% and into the AC mains, just for the split of a second and there was some fast beep sound from the instrument and i disconent it immediately. He appairs to work normal, on the V switch is showing 50Hz.  Is it well protected for the case of a misusing?
[/quote]
 

Online Monkeh

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Re: UNI-T UT61E Multimeter teardown photos.
« Reply #449 on: November 22, 2012, 05:08:31 pm »
I don't know really , just for the info. I turned the knob to Hz/% and into the AC mains, just for the split of a second and there was some fast beep sound from the instrument and i disconent it immediately. He appairs to work normal, on the V switch is showing 50Hz.  Is it protected for the case of a misusing?

No, it's playing the mains through the speaker. Yes, really.

It'll do that for a short while before it breaks. Don't use that switch position above 30V.
 


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