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UNI-T UT61E Multimeter teardown photos.

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crystal:

--- Quote from: centaurian on January 05, 2015, 11:44:30 pm ---crystal: Interesting. So it differs from Chinese version with 4 MOVs and bigger fuse holders - https://www.eevblog.com/forum/testgear/uni-t-ut61e-multimeter-teardown-photos/msg545943/#msg545943 (Also, there is missing VR5 calibration resistor for 10A range on that GS version).

So what's fuse voltage rating and type of MOV used in GS version?

--- End quote ---

The pic is from another thread, it seems I just can't find it now. I think I read somewhere fuses are 600V rated. Greetings

Mikeva:
hi guys!
it's been 2+ months since i bought the 61E and everything was ok until today....
I had an old transformer that i wanted to measure and wanted to figure out  which pins are for the primary 220v and which are  for the secondary 12v. Unfortunately by my mistake  i plugged the transformer giving the 220v on to the secondary and the result was to blow the multimeter.Didn't understand why that happen despite that the scale was on the ac volts as it should.....Now it's dead.Won't turn on.The fuses are ok,the ptc's seems ok ,the rectifier diode also ok.Any ideas?

Maxlor:
Not exactly sure I understood you correctly, but if you wired the transformer up backwards you'd get near 4000V out of it. That's plenty enough to kill the UT61E, it's not sufficiently protected against high voltage.

crystal:

--- Quote from: Mikeva on January 10, 2015, 10:02:31 pm ---hi guys!
it's been 2+ months since i bought the 61E and everything was ok until today....
I had an old transformer that i wanted to measure and wanted to figure out  which pins are for the primary 220v and which are  for the secondary 12v. Unfortunately by my mistake  i plugged the transformer giving the 220v on to the secondary and the result was to blow the multimeter.Didn't understand why that happen despite that the scale was on the ac volts as it should.....Now it's dead.Won't turn on.The fuses are ok,the ptc's seems ok ,the rectifier diode also ok.Any ideas?

--- End quote ---

Check all the passive components. If it's still dead then the main chip is fried. You could try contact the crystek for the replacement chip, maybe they will sent you the new one. Then if you are skillful enough change it but you will probably need to recalibrate the instrument.

PS:
Why in the hell would you check the unknown transformer like that? You could be dead, what about if it was less that 12V secondary? I always check the unknown transformer by measuring resistance and try it on mains with nothing attached to it and me on a distance.

Mikeva:
Yeap that,was stupidity from me.  |O Now I've learned my lesson....
Well, i'll check the components to see if something manage to stop all the voltage, but if it's the main chip that burned then i will throw it away and buy a new one.

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