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UNI-T UT61E Multimeter teardown photos.

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Mikeva:

--- Quote from: Rick Law on January 11, 2015, 10:09:49 pm ---
--- Quote from: Mikeva on January 11, 2015, 04:12:02 pm --- :D

--- End quote ---

That smilie means what?  You managed to revive your UT61E?

--- End quote ---

No,unfortunately!
I m laughing about the funeral march  that Wytnucls posted  above!

Steps:

--- Quote from: Teknotronix on January 29, 2012, 02:21:48 am ---
--- Quote from: sdttn on January 27, 2012, 03:07:15 pm ---
You should drive the backlight leds with transistors. It will safer than old hack.


Taken from UT60E dmm schematic.

--- End quote ---

In this configuration, couldn't the same protection be achieved by only using a single NPN rather than the complementary config shown here?

--- End quote ---


Hello Colleagues!
I going to do power off mod and backlit mod (with permanent light, not original). And I want that light will be off after DMM going to sleep. Can I connect +V of the LEDs to the positive side of C33, like for the IR transistor?
And should I add driving the backlight leds with transistors like in UT60E schematic?

rr100:

--- Quote from: Mikeva on January 10, 2015, 10:02:31 pm ---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 ---

The idea (for the next time) is to check the resistance with the multimeter first, for sure the primary would be the highest.
I am surprised nothing else blew first - and I wouldn't trust the isolation on that transformer anymore not to start a fire or electrocute somebody.

snowsnee:
Hey Guy Gals,

 New here, I got 2 UT61Es new I will post the backs open pictures and calibration. So far this to note UT61 series is the backlight UT61E does not have one. That series 61d or c b a may have one . Another note calibration right on 10.000, on two AD584KH with calibration stickers 10,001 cant calibrate right on the money can't calibrate nothing perfect. I asked some of the big time dealers AD584LH (not needed sticker notes I think ?) no calibration or AD584KH with calibration. One dealer selling AD584LH he said right now its AD584KH with calibration sicker to go by. Took a week of study nothing, so I just asked them the dealers which is best.

 So the one UT61E got from China $47 I got is accurate. UT61E $48.00 next I get I am getting from a dealer China 1000 miles away from each other. I will check the calibration to the other. I have 3 AD584KHs with sticker calibration set written (one coming still) to check accuracy then I will take apart show pictures of both if the same or not. (Note can't buy another multimeter better so I got 2 just because of the documentation this model.)

Edit: Now China dealer says ( yes, sure, there is a sticker) . AD584KH Dealer.   
Edit again: AD584LH ( it don't need calibration said big dealer eBay ) So it was like thought. And AD584KH does need the sticker calibration.

snowsnee:


This is new Jan 31 2015.  Voltage reference: (10 VDC)  Was 10.000 VDC OK  on upper one not adjusted. Was 9.998 VDC Now 10.000 on the other corrected bottom one. You can adjust further. Looks like same boards new out of China.

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