Author Topic: Brymen TBM251/ Toptronics TBM251  (Read 15919 times)

SeanB

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Brymen TBM251/ Toptronics TBM251
« on: January 19, 2013, 05:55:45 AM »
I got a little parcel from Martin yesterday. The expected croc leads from Frankie were in there, along with some of the nice little 3 digit LED displays Martin had recently.

Stuck in there as well was the unexpected gift from Martin.

The serial lead, complete with the interface. Will have to either find an USB/serial adaptor or go out and buy yet another one, preferably one I can open to adapt it to work with more than plain serial buses.

Probe set Brymen CATIV 1000V 10A rated, complete with nice gold flashing on them, and the nice little removeable sleeves to make them CATIV.

Next is the surprise, The TBM251 CAT IV/III/II multimeter. When I got it i turned it on, and looked at the functions I could use right off the bat. AC voltage and DC voltage work without a manual, and HZ works even on DC voltage. Resistance works ( not checked for accuracy, will have to dig out the precision resistors and see) and continuity and diode test work. Continuity is not latched, slight delay and not scratchy. tested with my voltage reference, and it is nearly exact, just flipping between 10.00 and 9.99 every so often.

Input selection protection works as well, nice and quick to remind you that you are in danger of doing something stupido.

I did a quick google for the manual ( Brymen site is not the place to look for it though, neither Hellerman Tytron/Toptronic either) and found the Swedish version on Elma Instruments website. First part Swedish, but the English is the second half, and shows functions I was puzzled about. Base model, no True RMS, no LowZ range no data logging, but still a good 6000 count 5 readings/sec meter nontheless.

There is a function called EF, and on reading I saw it is a live cable detector, and it does work quite well. On a mains cable I can see on the low resolution bargraph it shows the twist in the cable as the live lead twists around the inside. I can see that being very useful to play the old game with mains leads - guess the break.

On the whole from the outside a pretty good meter, and when I tried it out on an inverter it worked and displayed both input voltage and when asked input frequency.

Photo's of the inside to follow when I look inside.

iloveelectronics

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Re: Brymen TBM251/ Toptronics TBM251
« Reply #1 on: January 19, 2013, 09:38:24 AM »
Nice gift!! I find it interesting that you said the continuity tester has a slight delay, because my Brymen BM-257 seems to be fairly quick. It's not the quickest in my collection (my Mastech MS8250C is the fastest, it simply never misses), but it's certainly quick enough for most, if not all, practical uses.
My eBay store: http://www.99centHobbies.com
Email: franky @ 99centHobbies . com

SeanB

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Re: Brymen TBM251/ Toptronics TBM251
« Reply #2 on: January 19, 2013, 02:45:00 PM »
Not instant, just about the time it takes the display to update is the delay.

SeanB

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Re: Brymen TBM251/ Toptronics TBM251
« Reply #3 on: January 31, 2013, 01:43:52 PM »
Well, did a little work and made it slightly naked. Batteries were supplied by Martin, nice Duracell units. Will have to make a note to check them regular. Nice and easy acess to change the fuses, just in case you make an oops. Battery has a nice captive screw, and a nice hank fastener insert to put it into.


backopen by SeanB_ZA, on Flickr

Inside it looks quite nice, 2 boards, so I am not going to strip it further, as there is a chance that they will not go back together.


insideback by SeanB_ZA, on Flickr

Sneaked a look under the side, nice MOV's there.


underside by SeanB_ZA, on Flickr

Looking down from the top. Peeping down the top to see the switch there. Nicely hidden under a shield.


undertop by SeanB_ZA, on Flickr

Electric field sensor is nice feature, works quite well. Shows EF when nothing near, then as you bring a cable near the reading changes. One bar, there is a cable, 2 bars it is closer and 3 bars when it is right by the live inside the somewhat twisted cable I was using. Very sensitive, and works well enough to use as a tester to find a broken core inside an extension cable with minimal pain.


efieldmeasure by SeanB_ZA, on Flickr

Here is a close up of the antenna and the small inductor connected to it. This might cause a problem in reading low level high impedance AC sources in a high ambient field situation, but then again most meters will have a similar problem. Do not use when standing in front of a high power transmitter antenna.


esensor by SeanB_ZA, on Flickr



MJLorton

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Re: Brymen TBM251/ Toptronics TBM251
« Reply #4 on: February 01, 2013, 05:18:12 AM »
Thanks Sean!
Play, discover, learn and enjoy! (and don't be scared to make mistakes along the way!)

MJLorton

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Re: Brymen TBM251/ Toptronics TBM251
« Reply #5 on: February 20, 2013, 02:35:12 AM »
Here is the review of the Brymen TBM251 / BM251: https://www.youtube.com/watch?v=_AnIhAVnvH0

This is the same as the  Greenlee DM-200A: http://astore.amazon.com/m0711-20/detail/B003JZB4EE
Franky has the BM257: http://mjlorton.com/forum/index.php?topic=166.0
Tester.co.uk have the Metrel MD9040: http://www.tester.co.uk/metrel-md9040-trms-industrial-digital-multimeter

Play, discover, learn and enjoy! (and don't be scared to make mistakes along the way!)

Antraciet

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Re: Brymen TBM251/ Toptronics TBM251
« Reply #6 on: February 20, 2013, 06:03:40 AM »
Picture inside BM 257 .
« Last Edit: February 22, 2013, 03:20:10 AM by Antraciet »

iloveelectronics

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Re: Brymen TBM251/ Toptronics TBM251
« Reply #7 on: February 20, 2013, 07:37:02 AM »
And here's my review and teardown of the BM-257 in case anyone hasn't read it yet :)

http://mjlorton.com/forum/index.php?topic=164.0
My eBay store: http://www.99centHobbies.com
Email: franky @ 99centHobbies . com

Antraciet

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Re: Brymen TBM251/ Toptronics TBM251
« Reply #8 on: February 22, 2013, 03:20:42 AM »
And here's my review and teardown of the BM-257 in case anyone hasn't read it yet :)

http://mjlorton.com/forum/index.php?topic=164.0
Oww, sorry man. Yes i missed that interesting topic. Thank you.

retiredcaps

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Re: Brymen TBM251/ Toptronics TBM251
« Reply #9 on: May 17, 2013, 03:55:09 AM »
@SeanB,

Have you thought of modifying your TBM251 by cutting out the 2 holes on the front and making some softkeys to activate the REC and CREST functionality.

Something like this mod for a Fluke 10/11 to a Fluke 12 as per Excavatoree?

http://www.eevblog.com/forum/chat/fluke-25-my-first-digital-multimeter/

SeanB

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Re: Brymen TBM251/ Toptronics TBM251
« Reply #10 on: May 17, 2013, 03:06:08 PM »
Is a thought, but it isa such a nice meter still, very useful.