Author Topic: New TRMS Uni-T UT139C DMM is available now (Read 144367 times)

iloveelectronics · « **Reply #75 on:** November 03, 2014, 04:01:46 pm »

Quote from: gigahertz on November 03, 2014, 03:45:01 pm

Gents,

On your web site is mentioned “Optional AC/DC 60A current clamps in different models to measure current up to 60A(1mv=1A)”;
Where can I found the current clamp? Has it a separate ordering code?

Regards!

Uni-T actually don't have anything like that yet in their product line. You should be able to use any generic current clamps that work with multimeter though, such as this: http://www.amazon.com/Tecpel-CA-60-AC-Current-Clamp/dp/B002IRU3IM

SSchaffrath · « **Reply #76 on:** December 11, 2014, 01:08:57 pm »

Hi guys,
i blowed the small fuse up when i was testing it

Which replacement can i use, i cant find a 600ma 600v ceramic fuse...

Lightages · « **Reply #77 on:** December 11, 2014, 10:16:47 pm »

I am beginning to think that Dave needs to enforce mandatory country settings in member's profiles. How many times do we need to ask people to tell us where they are so they can buy from the right place?

Franky has a 630mA 500V fuse but that does no meet the CAT rating. But I am sure if you ask Franky he can get the right fuse.

SSchaffrath · « **Reply #78 on:** December 12, 2014, 04:24:09 am »

Im from Germany.
I tried it once to buy something from his ebay shop and it doesnt worked with German ebay.

iloveelectronics · « **Reply #79 on:** December 12, 2014, 04:50:51 am »

Quote from: SSchaffrath on December 12, 2014, 04:24:09 am

Im from Germany.
I tried it once to buy something from his ebay shop and it doesnt worked with German ebay.

Is it still the case right now? As far as I know people from Germany should be able to see my store now http://stores.ebay.com/99centhobbies

I'm out of stock on the 630mA 500V fuses though. 600mA 600V is actually a tricky one to source...

SSchaffrath · « **Reply #80 on:** December 12, 2014, 04:55:09 am »

Cool now i can see it

Last time i checked it, it was not possible.

Which alternatives do i can use for the UT139C ?

iloveelectronics · « **Reply #81 on:** December 12, 2014, 05:20:31 am »

Quote from: SSchaffrath on December 12, 2014, 04:55:09 am

Cool now i can see it

Last time i checked it, it was not possible.

Which alternatives do i can use for the UT139C ?

I will try to source some 6x32mm 600mA 1000V fuse, which would be suitable for both the UT139C and Brymen BM257S that I sell. It will likely take some time though as these fuses are not common.

In the mean time I guess you can try to buy some 500mA 500V or above rated fuse, which should do the job just fine as long as you know the limitations.

SSchaffrath · « **Reply #82 on:** December 12, 2014, 05:22:34 am »

Ok then i buy for the mean time your suggested ratings and when you sourced the suitable fuses for these meter then i buy some from you

Do i can use 6.3mmx32mm aswell?

iloveelectronics · « **Reply #83 on:** December 12, 2014, 05:26:42 am »

Quote from: SSchaffrath on December 12, 2014, 05:22:34 am

Ok then i buy for the mean time your suggested ratings and when you sourced the suitable fuses for these meter then i buy some from you

Do i can use 6.3mmx32mm aswell?

Yes, that should be fine. The sizes always vary slightly but the fuse holder should be able to accommodate them.

Yago · « **Reply #84 on:** December 12, 2014, 11:56:24 am »

The 857S is out now 3Room.
They fixed the backlight (perhaps some other changes IDK)!

iloveelectronics · « **Reply #85 on:** December 12, 2014, 01:13:49 pm »

Quote from: 3roomlab on December 12, 2014, 10:10:25 am

just curious @ franky, would you happen to have a ballpark price of brymen bm857a if you were to sell it?

I couldn't get good pricing on that model so I gave up a long time ago. The tme.eu pricing was (still is) incredibly low there's no way I would be able to compete.

SSchaffrath · « **Reply #86 on:** December 12, 2014, 02:29:48 pm »

Here Franky,

http://www.alibaba.com/product-detail/6x32-DMM-fuse-1000Vdc-600mA_60049386394.html

1000fuses minimum

lpc32 · « **Reply #87 on:** December 12, 2014, 03:06:01 pm »

Aren't there more specific specs needed than just the current and voltage ratings?

SSchaffrath: Try ebay.com instead of ebay.de. Maybe not all international sellers are listed in the .de site.

Lightages · « **Reply #88 on:** December 12, 2014, 05:56:35 pm »

If you look at the image of the fuses, you can see that they are also rated for breaking 10kA and have a UL symbol on them. Whether they actually are UL tested is another matter. The fact that they show a clean room and some kind of IC inspection or testing lab leads me to believe that they are not showing the actual environment they have for making fuses

classical · « **Reply #89 on:** January 06, 2015, 07:51:03 am »

Quote from: Lightages on October 19, 2014, 05:57:28 pm

DT2843R has True-RMS with DC, UT139C appears to be True-RMS AC only

Could this be confirmed in the meantime? In the manual of the 139C I find all the three symbols listed (Table VIII "Knobs and Keys for Range selection").

Wytnucls · « **Reply #90 on:** January 06, 2015, 09:08:19 am »

139C measures true RMS AC only. Bandwidth is narrow at 1kHz for voltage and current.

classical · « **Reply #91 on:** January 06, 2015, 09:19:17 am »

Thanks for the reply.

lpc32 · « **Reply #92 on:** January 06, 2015, 03:59:57 pm »

Makes me wonder. With a 1kHz bandwidth, what would you expect to see at 5/10/20kHz?

Wytnucls · « **Reply #93 on:** January 06, 2015, 04:11:08 pm »

Something like this, but with the slope starting at 1kHz:

lpc32 · « **Reply #94 on:** January 06, 2015, 04:16:44 pm »

So as long as it's pure sine you can just compensate?

Wytnucls · « **Reply #95 on:** January 06, 2015, 04:29:51 pm »

Probably not, as the curve could change shape with input voltage.

lpc32 · « **Reply #96 on:** January 06, 2015, 08:25:46 pm »

I see.

andrija · « **Reply #97 on:** January 06, 2015, 09:17:59 pm »

These fuses go for 40-50 dollars EACH, as per Digikey. Even in 1000's quantities they cost $25. How can these $70 multimeters afford to have them (and you need TWO)?

Actually, it's just Digikey. Element 14 only charges around 8 dollars and a 5 pack on Ebay (in original packaging) is around 45 so it's not THAT bad. Not sure why Digikey charges so much, must be a pricing mistake.

eas · « **Reply #98 on:** January 07, 2015, 04:41:56 am »

Has anyone explored the (unsoldered) header on the PCB (visible

)?

VDD, WP, SLC, SDA, V1, and two labeled CAL?

mmatic · « **Reply #99 on:** January 07, 2015, 06:06:56 pm »

Hey!

1.) Can anyone who owns this UT139C meter please measure burden voltage?
2.) What is measured accurancy at uA, mA, A range?
3.) Is contuinity test fast?

Best Regards Matic


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Author Topic: New TRMS Uni-T UT139C DMM is available now (Read 144367 times)

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