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UNI-T UT61E Multimeter teardown photos.
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tecnicaemail:
Friends follows pictures of the disassembled multimeter.

































I took several photos to be able to see clearly.

There are some spots that seem to have oxidation should I clean?

I circulated in white, where it appears to be oxidation!

I thank everyone.
Fungus:

--- Quote from: tecnicaemail on September 16, 2020, 07:49:08 pm ---There are some spots that seem to have oxidation should I clean?

I circulated in white, where it appears to be oxidation!

--- End quote ---

That's flux residue. It looks like some things have been soldered and/or retouched by hand.

It's probably not important but you might as well clean it next time you take it apart.

Fuses look OK - much better than the glass fuses found inside some of these meters.

There's still some missing safety components though. All the squares labelled "SG" should have a Spark Gap (or maybe a MOV) in them.
tecnicaemail:

--- Quote from: Fungus on September 17, 2020, 11:13:52 am ---
--- Quote from: tecnicaemail on September 16, 2020, 07:49:08 pm ---There are some spots that seem to have oxidation should I clean?

I circulated in white, where it appears to be oxidation!

--- End quote ---

That's flux residue. It looks like some things have been soldered and/or retouched by hand.

It's probably not important but you might as well clean it next time you take it apart.

Fuses look OK - much better than the glass fuses found inside some of these meters.

There's still some missing safety components though. All the squares labelled "SG" should have a Spark Gap (or maybe a MOV) in them.

--- End quote ---


Thanks for the reply friend, taking advantage and abusing your knowledge I have the opportunity to exchange this Unit UT61E for a UT532 do you think the exchange is viable? Because I noticed that UT532 does not measure Amperage in microamperage and I am in doubt if its capacitance is good to measure, could you give me your opinion? I am grateful, thank you.
myf:
Hello,

I have now 2 ut-61e. And I won't switch to any other multimeter (in this price range).

Indeed, first it's a 20000 count DMM. Of course it's not a precise 20000 counts. But 20000-counts multimeter is more precise than a 2000-counts multimeter and avoid switching range for a 10 times larger measure, or a 10 times smaller measure.

Second the usb-link from ut-61 to laptop is around 10eur and is very conveniant. There are very few with this possibility, at this price with its insulated link.

I test several claimed 0.01% resistors bought on ebay (but I'm not sure, it seems it was an old stock with unknown history). With 3 resistors, series connections and/or parallels connections every time 5 counts were missing : 9995 and not 10k, 19995, 4995, etc. There was about +/-1 or 2 count difference between the 2 multimeters. Theses errors seem to proof a light multimeter error, not an error of resistor value, but I don't have others material nor idea to proof this.

min/max switch on ut-61e is powerful : It actually the peak value during a very very short time (maybe 1ms or less),  not the extreme values read on the multimeter : a mean on 0.5 second.     

It seems that ut-71 is more expensive and older than the ut-61. Temperature measures seems the only missing tips on this ut-61e.

Hope this help you to choose !

F.
indman:

--- Quote from: myf on September 17, 2020, 04:01:05 pm ---I test several claimed 0.01% resistors bought on ebay (but I'm not sure, it seems it was an old stock with unknown history). With 3 resistors, series connections and/or parallels connections every time 5 counts were missing : 9995 and not 10k, 19995, 4995, etc. There was about +/-1 or 2 count difference between the 2 multimeters. Theses errors seem to proof a light multimeter error, not an error of resistor value, but I don't have others material nor idea to proof this.

--- End quote ---

UT-61E has low linearity of resistance measurements even in comparison with simpler Chinese models.
Here is a simple experiment that anyone can repeat.
I took 4 resistors C2-13 0.25 0.1%:
1.1kΩ
2.1kΩ
3.2kΩ
4.1.3kΩ
You can see the result of the sum of resistances on the display of each multimeter. And I wrote the results of measurements of each resistor separately in brackets.
In the photo there are 4 devices with the results of measuring this chain of resistors:
1.UT61E (0.995 + 0.995 + 1.992 + 1.294 = 5.276) - difference 13 ohms
2. Aneng Q1 (0.999 + 0.999 + 1.997 + 1.299 = 5.294) -  difference 4 ohms
3. Aneng AN302 (1.000 + 1.000 + 1.998 + 1.300 = 5.298) - difference 0 Ohm
4. Victor VC921 (1.001 + 1.002 + 2.001 + 1.302 = 5.306) - difference 1 Ohm
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