New Brymen BM2257 Multimeter

[EEVblog]

Do you work on Saturdays? Half past midnight now in Germany, will check the store in 8 hours

Not often, but I'm here today as rain has cancelled some kids stuff.

It's now on the store, but I have yet to do the manual and some other stuff ince the serial interface.
https://eevblog.store/products/eevblog-bm2257-multimeter

[Furna]

Do you work on Saturdays? Half past midnight now in Germany, will check the store in 8 hours

Not often, but I'm here today as rain has cancelled some kids stuff.

It's now on the store, but I have yet to do the manual and some other stuff ince the serial interface.
https://eevblog.store/products/eevblog-bm2257-multimeter

Sorry for your kids missing their open air time.
Having issue finalizing the order "No delivery available" 

[EEVblog]

Having issue finalizing the order "No delivery available" 

Odd. Can't see any issue on the listing compared to other products.
DM me your address so I can test it.

[EEVblog]

Having issue finalizing the order "No delivery available" 

Odd. Can't see any issue on the listing compared to other products.
DM me your address so I can test it.

I put a random addres in Germany and got the same message. Can you try another product, I want to see if it's the new product or not.
EDIT: I think it's the new product somewhow...

EDIT2: I think I fixed it, please try again!

[Furna]

Having issue finalizing the order "No delivery available" 

Odd. Can't see any issue on the listing compared to other products.
DM me your address so I can test it.

I put a random addres in Germany and got the same message. Can you try another product, I want to see if it's the new product or not.

I was able to finalize order #2252 *without* BM2257

[EEVblog]

I think I fixed it, please try again.
Stupid Shopify doesn't automatically add new products to the "physical store" 

[EEVblog]

I was able to finalize order #2252 *without* BM2257

Woah, you finalised the order without the meter?
If you did want the meter I'll have tro refund and cancel that order, is that what you want?

[Furna]

I think I fixed it, please try again.
Stupid Shopify doesn't automatically add new products to the "physical store" 

Order #2253 finalized with BM2257 included!

[Furna]

I was able to finalize order #2252 *without* BM2257

Woah, you finalised the order without the meter?
If you did want the meter I'll have tro refund and cancel that order, is that what you want?

I want #2252 + #2253
minus the double shipping expenses

[EEVblog]

I think I fixed it, please try again.
Stupid Shopify doesn't automatically add new products to the "physical store" 

Order #2253 finalized with BM2257 included!

Thanks. But the problem is now that you have paid for two separate shipping charges, and I can't manually add things. Let me cancel the 2251 order for the case and probes and I'll just include a case in the BM2257 order. The probes are already included, unless you need a spare set?

[EEVblog]

I was able to finalize order #2252 *without* BM2257

Woah, you finalised the order without the meter?
If you did want the meter I'll have tro refund and cancel that order, is that what you want?

I want #2252 + #2253
minus the double shipping expenses

I'll refund the shipping on the 2252 order and will ship as one lot. It gets messy.

[Furna]

I was able to finalize order #2252 *without* BM2257

Woah, you finalised the order without the meter?
If you did want the meter I'll have tro refund and cancel that order, is that what you want?

I want #2252 + #2253
minus the double shipping expenses

I'll refund the shipping on the 2252 order and will ship as one lot. It gets messy.

Got the refund already; thank you.
Sorry for the mess ... happy we figured it out.

Hope the rain at your place stops soon!

[mbarszcz]

Dave,

Do you know if the LoZ circuit is the same on the BM2257 as it was on the BM235?  After this interesting discussion: https://www.eevblog.com/forum/testgear/bm235-loz-mode/msg5734755/#msg5734755 I'm curious if the behavior has changed?

[rdenney]

@EEVBlog Dave, you mentioned (somewhere--now I can't find where) this was available on Amazon for a slightly higher price, and you provided a link from your YouTube video. But that link brings up the previous model BM235. Will the new model be supplied? I'm not sure I need yet another handheld DMM, but, of course, that's crazy talk.

Rick "always needs another DMM" Denney

[Furna]

@EEVBlog Dave, you mentioned (somewhere--now I can't find where) this was available on Amazon for a slightly higher price, and you provided a link from your YouTube video. But that link brings up the previous model BM235. Will the new model be supplied? I'm not sure I need yet another handheld DMM, but, of course, that's crazy talk.

Rick "always needs another DMM" Denney

The link to Amazon is on the EEVBlog shop page dedicated to the new BM2257
https://eevblog.store/products/eevblog-bm2257-multimeter
"Americans can now purchase the BM2235 though Amazon!"
and I confirm it brings up the "old" BM235

[floobydust]

Some confusion about the smaller mA/uA range fuse.
BM2257, BM2251 User's Manual (r3) specifies 0.63A fuse (ASTM HV620.0.63)
ASTM website only offer 0.6A fuse (HV620.0.6) and meter face is labelled 0.6A I guess for the range.

Dave can you comment if this is a custom part? Your store has the 0.4A part for the EEVblog BM235, BM786, and 121GW Multimeters.

[EEVblog]

Some confusion about the smaller mA/uA range fuse.
BM2257, BM2251 User's Manual (r3) specifies 0.63A fuse (ASTM HV620.0.63)
ASTM website only offer 0.6A fuse (HV620.0.6) and meter face is labelled 0.6A I guess for the range.
Dave can you comment if this is a custom part? Your store has the 0.4A part for the EEVblog BM235, BM786, and 121GW Multimeters.

It is supplied with a 630mA HV620 1000V fuse from ASTM. No part number on it because that's usually on the bulk box only.
So unless the normal 600mA is actually marked 630mA, yeah, it might be custom.
I can't see why given the BM235 and BM786 also have a 600mA range and use the 400mA fuse.
It's going to be annoying if I have to stock both.
I'll ask them.

[EEVblog]

@EEVBlog Dave, you mentioned (somewhere--now I can't find where) this was available on Amazon for a slightly higher price, and you provided a link from your YouTube video. But that link brings up the previous model BM235. Will the new model be supplied?

No, if you want the BM2257 you'll have the wait for the BM2257 listing which I haven't done yet. The old BM235 link is there because I copied the listing over.

[EEVblog]

Dave,
Do you know if the LoZ circuit is the same on the BM2257 as it was on the BM235?  After this interesting discussion: https://www.eevblog.com/forum/testgear/bm235-loz-mode/msg5734755/#msg5734755 I'm curious if the behavior has changed?

As mentioned here, it's different:
https://www.eevblog.com/forum/testgear/bm235-loz-mode/msg5723763/#msg5723763

I can measure a 1.5V battery at full 1mV resolution on the BM2257. Doesn't work at all on the BM235
I forgot that's an important difference to the BM235, so have added that to the listing.

[Kessler]

I just got my meter today ! I am a beginner and this is the first nice DMM I have had. Everything in the past has been cheap DMMs. Now off to go figure out what relay on my car is failing. 

[EEVblog]

Some confusion about the smaller mA/uA range fuse.
BM2257, BM2251 User's Manual (r3) specifies 0.63A fuse (ASTM HV620.0.63)
ASTM website only offer 0.6A fuse (HV620.0.6) and meter face is labelled 0.6A I guess for the range.
Dave can you comment if this is a custom part? Your store has the 0.4A part for the EEVblog BM235, BM786, and 121GW Multimeters.

It is supplied with a 630mA HV620 1000V fuse from ASTM. No part number on it because that's usually on the bulk box only.
So unless the normal 600mA is actually marked 630mA, yeah, it might be custom.
I can't see why given the BM235 and BM786 also have a 600mA range and use the 400mA fuse.
It's going to be annoying if I have to stock both.
I'll ask them.

Brymen replied and said the fuse is now 630mA because too many people questioned why a 400mA fuse (originally SIBA) was used in a 600mA range meter on the BM230 and BM780 series.
So with this new design BM2257 they submitted the meter with the ASTM 630mA fuse to UL and it was approved under IEC/EN/UL 61010-1/-2-033, so 630mA it is.
Why 630mA instead of 600mA? They didn't say, but the BM2257 does actually measure above 600mA in practice, so maybe they decided it would be nice to have a little over 600mA?

They can't retroactively change the BM230 and BM780 series to 630mA ASTM because technically it would require re-submitting the meter for UL approval again. And Brymen are super fussy about doing UL approval by the book.
Without a doubt the 600/630mA ASTM could also be used in the other models, but they can't officially say that.

[floobydust]

Limiting factor is the shunt resistor clamp-diodes, they must clear the fuse and never go open circuit.
Did you notice BM2257 they went overboard - five of 15A (350A 1/2 cycle surge) SMC parts - biggest diodes ever used there 
Not sure why Brymen upsized when everyone else has been using 1A (4007, M7) parts (Fluke, Agilent, BM235, 786, 857 and others) for many years.
It's great they are huge and safer, not likely to not care at all about clearing bigger fuses.

New regulatory testing costs a lot of money. To save lab time I will submit a few variants for testing at the same time.
Whatever meets spec and survives the tests gets put into the report, so you don't get locked in to using one specialty part.
BM235 pics showed 500mA Siba GZ DMI Prot, 70-172-40/0.5A so that series would likely work too, they have a 630mA part.

[Monkeh]

Some confusion about the smaller mA/uA range fuse.
BM2257, BM2251 User's Manual (r3) specifies 0.63A fuse (ASTM HV620.0.63)
ASTM website only offer 0.6A fuse (HV620.0.6) and meter face is labelled 0.6A I guess for the range.

Dave can you comment if this is a custom part? Your store has the 0.4A part for the EEVblog BM235, BM786, and 121GW Multimeters.

I'd bet money it's exactly the same fuse, they just put a different label on it because someone preferred less rounding (see: Renard series). I can't see the fuse wire being made to tolerances tight enough to actually differentiate at that level, 30mA is in the noise.

E: Then again, they do offer the 315mA and 400mA options, only 30mohm between them..

I wouldn't bat an eyelid at the difference if I needed a replacement, anyway.

[Gyro]

...
Why 630mA instead of 600mA? They didn't say, but the BM2257 does actually measure above 600mA in practice, so maybe they decided it would be nice to have a little over 600mA?
...

Because 630mA is an industry standard value (like 3.15A for instance). Look on a main distributor site and you will find a couple of 600mA fuses but dozens of 630mA.


Edit: Snap.

[mwb1100]

SIBA 7017240 comes in a 630mA SKU that should be an equivalent to the ASTM part:

  - SIBA 7017240.0,63 630mA 1000V  IR 30kA  (6 x 32mm)

The SIBA fuses aren't too hard to find at a reasonable price.

  - https://www.aliexpress.us/item/3256806238128876.html  (if you trust Aliexpress seller) $12 for 10, shipping included
  - https://www.aliexpress.us/item/3256802828651015.html  (if you trust Aliexpress seller) $20 for 20, shipping included

A more trustworthy vendor (but I don't know what the shipping would be):

  - https://www.tme.eu/en/details/zgssh-0.63a/fuses-6-3x32mm-super-fast/siba/7012540-0-63/  $3 each

The 500mA variant is even easier to find and might make an acceptable replacement.