Author Topic: US$150 Class Multimeter  (Read 18950 times)

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Offline coromonadalix

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Re: US$150 Class Multimeter
« Reply #75 on: May 01, 2020, 12:26:46 am »
121gw  lite ??
 

Offline maginnovision

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Re: US$150 Class Multimeter
« Reply #76 on: May 01, 2020, 01:12:20 am »
It's supposed to be a more durable meter than the 121gw. So I'd call it a 121gw X-Plus ala siglent.
 

Offline EEVblog

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Re: US$150 Class Multimeter
« Reply #77 on: May 01, 2020, 01:23:22 am »
It's supposed to be a more durable meter than the 121gw.

Actually that's an interesting point.
Certainly more rugged from an electrical point of view, but from a mechanical point of view, I don't know. The 121GW is a full holster based meter, this one is an overmoulded split case design. Similar to say a Fluke 77 IV



Of course the 77 IV is stupidly rugged, so it's not a matter of just having lack of a thick holster. It feels pretty rugged.
Now that I think about it, yeah, it's kind a competitor to the Fluke 77 IV in terms of look'n'feel of the overmoulded case, no fuse access via battery compartment, but with extra stuff like EF testing, 60,000 count, proper low current support, way better specs etc. i.e. a proper "electronics" version of a Fluke 77 IV.
« Last Edit: May 01, 2020, 01:31:29 am by EEVblog »
 

Offline rsjsouza

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Re: US$150 Class Multimeter
« Reply #78 on: May 01, 2020, 01:31:20 am »
Great suspense, Dave!

A split case is less desirable from my point of view, but a recently acquired Amprobe is quite well done and fells really robust.
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Offline EEVblog

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Re: US$150 Class Multimeter
« Reply #79 on: May 01, 2020, 01:32:30 am »
Great suspense, Dave! A split case is less desirable from my point of view, but a recently acquired Amprobe is quite well done and fells really robust.

Yeah, I didn't know it was split case fuses inside until I got it. The early photos were just from the front were you can't tell.
 

Offline EEVblog

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Re: US$150 Class Multimeter
« Reply #80 on: May 01, 2020, 01:53:15 am »
And it's got a custom hybrid resistor divider too, wasn't expecting that for the price, but I guess it's the only way they could get the fairly tight spec.
 

Offline coromonadalix

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Re: US$150 Class Multimeter
« Reply #81 on: May 01, 2020, 02:24:41 am »
Dave i'm having a nervous breakdown from waiting  loll

Can the design be changed in the future for the fuses access,  meaning like a huge battery door and fuses change without opening the meter each time ?

Or Its an almost or "in production" model ?
 

Offline EEVblog

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Re: US$150 Class Multimeter
« Reply #82 on: May 01, 2020, 02:26:40 am »
Can the design be changed in the future for the fuses access,  meaning like a huge battery door and fuses change without opening the meter each time ?
Or Its an almost or "in production" model ?

Nope, it's done, it's passed UL and other testing. This is what will ship.
 

Offline EEVblog

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Re: US$150 Class Multimeter
« Reply #83 on: May 01, 2020, 02:35:32 am »
- Jack alert doesn't work, but it's supposed to have it.

Idiot Dave forgot to install the fuses after reassembly  :palm:
 
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Offline maginnovision

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Re: US$150 Class Multimeter
« Reply #84 on: May 01, 2020, 03:15:02 am »
I can see why some people don't like the lack of fuse access but it definitely doesn't bother me. I actually prefer the overmould design as opposed to a holster as well in virtually every meter I've owned. Looking forward to seeing it.
 

Online Monkeh

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Re: US$150 Class Multimeter
« Reply #85 on: May 01, 2020, 03:21:56 am »
Hard to get at and expensive fuses are just motivation not to be an idiot and blow them.
 

Offline ahbushnell

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Re: US$150 Class Multimeter
« Reply #86 on: May 01, 2020, 04:11:44 am »
In case you haven't figured it out, I fishing to see if it's worthwhile stocking a US$150 class meter in addition to my $100 class BM235 and $200 class 121GW.
I paid 135 + CA tax for the EEVblog Brymen BM235 Multimeter on amazon a few months ago.

Great meter.  I notice it's not available now. 
 

Offline EEVblog

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Re: US$150 Class Multimeter
« Reply #87 on: May 01, 2020, 04:13:03 am »
Great meter.  I notice it's not available now.

Just got new stock in yesterday, need to ship more to the Amazon mothership.
 

Offline EEVblog

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Re: US$150 Class Multimeter
« Reply #88 on: May 01, 2020, 08:22:15 am »
And it's got a custom hybrid resistor divider too, wasn't expecting that for the price, but I guess it's the only way they could get the fairly tight spec.

[attachimg=1]
 

Offline Brumby

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Re: US$150 Class Multimeter
« Reply #89 on: May 01, 2020, 08:54:44 am »
- Jack alert doesn't work, but it's supposed to have it.

Idiot Dave forgot to install the fuses after reassembly  :palm:

Sounds like something I'd do.    ;D
 

Offline evava

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Re: US$150 Class Multimeter
« Reply #90 on: May 01, 2020, 09:13:59 am »
Is there a reason why wait on this meter instead of buying Brymen 857s ?
Can this be more bang for the buck?
 

Offline EEVblog

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Re: US$150 Class Multimeter
« Reply #91 on: May 01, 2020, 09:25:35 am »
Is there a reason why wait on this meter instead of buying Brymen 857s ?
Can this be more bang for the buck?

Depends what you need. The 857S is based on a really old design, but it's got 500,000 count mode and PC interface. This new meter has EF detection, visual continuity, almost certainly more modern front protection and higher 60,000 count in normal mode. Maybe other things I haven't done a full comparison.
 
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Offline Muttley Snickers

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Re: US$150 Class Multimeter
« Reply #92 on: May 01, 2020, 10:12:17 am »
I couldn't wait any longer so am going to go with the one in the video below, a comprehensive teardown and re-assembly is also included. A few of the special features it incorporates are visual continuity display, ac voltage indication, fuse free operation, one second auto power off and an automatic natural selection mode.   :-DMM :o ::)

https://youtu.be/YEfiyPFWVdg
 
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Online 2N3055

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Re: US$150 Class Multimeter
« Reply #93 on: May 01, 2020, 11:20:37 am »
And it's got a custom hybrid resistor divider too, wasn't expecting that for the price, but I guess it's the only way they could get the fairly tight spec.

[attachimg=1]
Well that resistor divider being stuck to the board kinda defies the purpose of that quite nice separation distance..  That is not going to help with breakdown voltage...
But it might not be a problem if input clamps keep it at safe voltage..
 

Offline EEVblog

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Re: US$150 Class Multimeter
« Reply #94 on: May 01, 2020, 01:06:41 pm »
And it's got a custom hybrid resistor divider too, wasn't expecting that for the price, but I guess it's the only way they could get the fairly tight spec.

[attachimg=1]
Well that resistor divider being stuck to the board kinda defies the purpose of that quite nice separation distance..  That is not going to help with breakdown voltage...

Not at all. You still have the PCB creepage, no difference in distance, and it's not stuck down, just bent over.

Quote
But it might not be a problem if input clamps keep it at safe voltage..

That's the job of a clamp.
« Last Edit: May 01, 2020, 01:10:16 pm by EEVblog »
 
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Online 2N3055

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Re: US$150 Class Multimeter
« Reply #95 on: May 01, 2020, 01:26:16 pm »
And it's got a custom hybrid resistor divider too, wasn't expecting that for the price, but I guess it's the only way they could get the fairly tight spec.

[attachimg=1]
Well that resistor divider being stuck to the board kinda defies the purpose of that quite nice separation distance..  That is not going to help with breakdown voltage...

Not at all. You still have the PCB creepage, no difference in distance, and it's not stuck down, just bent over.

Thanks for clarification, on photo it looks to be down on board, at the level of that screw head, touching it...
But that is all just talk. If it works it works..
Regards,
Sinisa
 

Offline EEVblog

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Re: US$150 Class Multimeter
« Reply #96 on: May 01, 2020, 02:46:59 pm »
Thanks for clarification, on photo it looks to be down on board, at the level of that screw head, touching it...

Even if it was flat on the PCB touching for the entire surface it wouldn't make a difference, the creepage distance is the same length along the PCB anyway.
 

Online 2N3055

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Re: US$150 Class Multimeter
« Reply #97 on: May 01, 2020, 02:52:50 pm »
Thanks for clarification, on photo it looks to be down on board, at the level of that screw head, touching it...

Even if it was flat on the PCB touching for the entire surface it wouldn't make a difference, the creepage distance is the same length along the PCB anyway.
That's debatable, if you look, at half of resistor creepage distance there is ground underneath the resistor. So looking at that, that is definitely half of what is resistor rated for... But still, what is left is a lot, and if something discharges it will go to ground, not to input.
Like I said, looks funny, but probably not an issue...
Thanks for nice discussion.
 

Offline rsjsouza

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Re: US$150 Class Multimeter
« Reply #98 on: May 01, 2020, 03:28:14 pm »
automatic natural selection mode.
Yes... Darwin natural selection when plugged to that 1kW power supply!  :-DD

The use and abuse of hot melt glue is something that bothers me - when I was a young padawan doing these projects with my dad in the 80's, he taught me to properly cut your panels and attach all the mounts obeying their specifications. I somehow can't help but wonder that he would slap me in the head if I came up with something this ugly.  :scared:
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Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 

Offline joeqsmith

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Re: US$150 Class Multimeter
« Reply #99 on: May 01, 2020, 05:34:51 pm »
I couldn't wait any longer so am going to go with the one in the video below, a comprehensive teardown and re-assembly is also included. A few of the special features it incorporates are visual continuity display, ac voltage indication, fuse free operation, one second auto power off and an automatic natural selection mode.   :-DMM :o ::)

https://youtu.be/YEfiyPFWVdg
Best post so far!
How electrically robust is your meter?? https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 


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