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UNI-T UT61E Multimeter teardown photos.

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T4P:
I don't understand what he means by "SUMMIT" and he's derailling the thread ...  >:(

gatos:

--- Quote from: T4P on February 26, 2013, 01:08:21 am ---I don't understand what he means by "SUMMIT" and he's derailling the thread ...  >:(

--- End quote ---
Summit=brand of multimeter. See my post at  February 24, 2013, 01:48:31 PM. I think it is obvious  :-+

I'm not trying to derail the thread. Sorry for polluting the thread.

I understand after all that I should trust the newly bought UT-61E (and buy a DMMcheck).

Thank you for your opinions and I can assure you that I did not meant to upset anyone.
Have a nice day.

erick:
Hello, everyone.

Although this is my first post, I've been following the forum and watched Dave's videos for quite a good time. A lot of fun and useful information.

I am a mechanical engineer, and electronics for me is just a hobby. So far, all my small projects are arduino related. So, in terms of electronics, I am a complete newbie.

Well, let's go. After watching Dave's shootout video, I decided to buy a UT61X to replace my cheaper multimeter. I could not decide between UT61D and UT61E, though, and then I came to this thread.

Although I find the backlight feature in UT61D really handy, the better specs of the UT61E model would certainly catch my favour. By reading your posts, however, I disappointedly found out about the burden voltage downside.

According to Dave's video, UT61D has surprisingly low burden voltage. Here comes my question. Since the UT61E is expected to deliver better accuracy, isn't it supposed to, at least, be as good as UT61D in terms of burden voltage? Is there a technical explanation to this fact? I mean, isn't burden voltage somehow related to accuracy?

I apologize if that is too silly a question. I just want to try to understand a bit more about multimeters specs.

Lightages:
Burden voltage is another spec that doesn't necessarily have to be low for a meter to have other specs with high accuracy. Yes it is horrible with the UT61E. For a bit more, $90, get the Amprobe AM-270 if you can it into Brazil without high taxes. I know how hard it is to get anything in South America for normal prices.....

mariush:

--- Quote from: erick on March 17, 2013, 08:14:55 pm ---
According to Dave's video, UT61D has surprisingly low burden voltage. Here comes my question. Since the UT61E is expected to deliver better accuracy, isn't it supposed to, at least, be as good as UT61D in terms of burden voltage? Is there a technical explanation to this fact? I mean, isn't burden voltage somehow related to accuracy?

I apologize if that is too silly a question. I just want to try to understand a bit more about multimeters specs.

--- End quote ---

The "brains" inside the UT61D is totally different than the one inside the UT61E, they're made by different companies, with different features and so on. So it's no surprise the burden voltage is a bit different, the meters don't have the same components inside.

All meters have burden voltage, can't really get around that, it's just that ut61e has quite a big value (about 1v for the 220mA range)
Even Fluke meters aren't so awesome when it comes to burden voltage:

http://www.fluke.com/fluke/usen/community/fluke-news-plus/ArticleCategories/Electrical/BurdenVoltage.htm


--- Quote ---In the case of the 87V which I mentioned earlier, the burden voltage for the 400 mA range is typically 1.8 mV/mA. What that means is that if we're reading 1 ma, there will be 1.8 mV drop across the terminals of the meter, and if we're reading 300 mA, there will be roughly 0.54 volts drop across the terminals.

--- End quote ---

So if you're really trying to measure some low voltage stuff, with low power consumption, even with Fluke the 0.3-0.5v drop will be an issue.

Not much you can do about it other than possibly using clamp meters or using a device like dave's uCurrent.

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