Author Topic: New EEVblog BM786 Multimeter  (Read 69296 times)

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Online Specmaster

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Re: New EEVblog BM786 Multimeter
« Reply #125 on: November 16, 2020, 10:20:14 am »
What's the Brymen top high-end DMM now?  BM869s (2011) or BM789 (2020)?

What do you mean? For electrician that works on 3 phase systems, one with measurements for that would be top.

If you mean best DC specs and longest scale, than BM869S and BM859S are best still...

The lower cost BM786 beats the BM869 on Dc current spec BTW.

If you don't need the temperature scale, how about the 867S?
Who let Murphy in?

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Offline 2N3055

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Re: New EEVblog BM786 Multimeter
« Reply #126 on: November 16, 2020, 10:54:51 am »
What's the Brymen top high-end DMM now?  BM869s (2011) or BM789 (2020)?

What do you mean? For electrician that works on 3 phase systems, one with measurements for that would be top.

If you mean best DC specs and longest scale, than BM869S and BM859S are best still...

The lower cost BM786 beats the BM869 on Dc current spec BTW.

If you don't need the temperature scale, how about the 867S?

BM867 has only advantage of dual display screen.

Correct comparison is with older single display 857/859 that have comparable accuracy. BM785/6/9 are more of a refresh of those single display meters. Honestly, 60000 display is good enough (500000 mode is of limited use) and BM78x series have nice features (remembers sound preferences, backlight was improved, has AutoHold, has Diode test mode same as Flukes, flashes light on continuity etc, check datasheet for details) that are supposed to remove some of complaints of traditional Fluke users.

Basicaly, Brymen BM789 series makes Fluke 87V seriously not worth the money they ask for it...
 
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Offline EEVblog

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Re: New EEVblog BM786 Multimeter
« Reply #127 on: November 16, 2020, 10:53:33 pm »
Basicaly, Brymen BM789 series makes Fluke 87V seriously not worth the money they ask for it...

The BM780 series has the same overmolded rubber housing, size and shape as the Fluke 70 series, so it's clearly designed to compete with that. But it also has the electronics capability of the 87V as well.
 

Offline EEVblog

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Re: New EEVblog BM786 Multimeter
« Reply #128 on: November 16, 2020, 10:56:22 pm »
What's the Brymen top high-end DMM now?  BM869s (2011) or BM789 (2020)?
What do you mean? For electrician that works on 3 phase systems, one with measurements for that would be top.
If you mean best DC specs and longest scale, than BM869S and BM859S are best still...
The lower cost BM786 beats the BM869 on Dc current spec BTW.
If you don't need the temperature scale, how about the 867S?

The BM867S still misses out on AutoHold, EF tester, Beeplit continuity, and is bigger and heavier.
 

Online Specmaster

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Re: New EEVblog BM786 Multimeter
« Reply #129 on: November 17, 2020, 01:50:37 pm »
Not quite true, if you press the REC button on the 867s before taking a measurement, then apply the probes to the DUT, or voltage source, then the meter does indeed record the HIGH value for you, not sure if this a documented feature or not, but it is handy.
Who let Murphy in?

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Offline rsjsouza

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Re: New EEVblog BM786 Multimeter
« Reply #130 on: November 17, 2020, 02:04:47 pm »
Specmaster, by HIGH you mean the highest value read? The Autohold continuously monitors the inputs and holds (and beeps) for any stable measurement, regardless of any previous value.

The BM78x family having autohold is indeed a great advantage over the BM85x/BM86x, but the price differences and the feature overlaps surely don't help when trying to make a decision.
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Re: New EEVblog BM786 Multimeter
« Reply #131 on: November 17, 2020, 02:33:24 pm »
Correct, it is the highest value and you measure another voltage which is higher, then the meter will beep and store that new value, but has to be higher than the last one.
Who let Murphy in?

Brymen-Fluke-HP-Thurlby-Heathkit-Thander-Tek-Extech-Black Star-GW-Advance-Avo-Kyoritsu-Amprobe-ITT-Robin-TTi
 
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Offline Wytnucls

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Re: New EEVblog BM786 Multimeter
« Reply #132 on: November 17, 2020, 03:20:35 pm »
It is documented. REC gives you the usual Max/Min/Average values as on other multimeters.
 

Offline maginnovision

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Re: New EEVblog BM786 Multimeter
« Reply #133 on: November 17, 2020, 05:29:23 pm »
Yea, that's an entirely different thing.
 

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Re: New EEVblog BM786 Multimeter
« Reply #134 on: November 17, 2020, 05:56:28 pm »
It is documented. REC gives you the usual Max/Min/Average values as on other multimeters.
Yes I understand that, but what I'm saying here is, that the REC is a possible workaround to the issue of autohold, unless autohold will automatically reset itself each time, then you will have to manually reset it, then surely the REC function works in just same fashion, except, if you then probe another point of the DUT, if that voltage is higher than it will overwrite the held value.
Who let Murphy in?

Brymen-Fluke-HP-Thurlby-Heathkit-Thander-Tek-Extech-Black Star-GW-Advance-Avo-Kyoritsu-Amprobe-ITT-Robin-TTi
 

Offline EEVblog

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Re: New EEVblog BM786 Multimeter
« Reply #135 on: November 17, 2020, 10:25:39 pm »
It is documented. REC gives you the usual Max/Min/Average values as on other multimeters.
Yes I understand that, but what I'm saying here is, that the REC is a possible workaround to the issue of autohold, unless autohold will automatically reset itself each time

AutoHold does reset itself, that's why it's called AUTOhold. Just like the original Fluke TouchHold who I believe invented it on the 70 series.
 

Online Specmaster

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Re: New EEVblog BM786 Multimeter
« Reply #136 on: November 17, 2020, 10:40:21 pm »
It is documented. REC gives you the usual Max/Min/Average values as on other multimeters.
Yes I understand that, but what I'm saying here is, that the REC is a possible workaround to the issue of autohold, unless autohold will automatically reset itself each time

AutoHold does reset itself, that's why it's called AUTOhold. Just like the original Fluke TouchHold who I believe invented it on the 70 series.
Yes, it does, I just tried the Hold function on my Fluke 27 which works perfectly.
Who let Murphy in?

Brymen-Fluke-HP-Thurlby-Heathkit-Thander-Tek-Extech-Black Star-GW-Advance-Avo-Kyoritsu-Amprobe-ITT-Robin-TTi
 
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Offline Wytnucls

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Re: New EEVblog BM786 Multimeter
« Reply #137 on: November 18, 2020, 12:33:22 pm »
Fuse replacement seems like a bit of a nuisance for such a recently designed multimeter:
8 screws to remove the front panel and battery compartment for access to both fuses.
 
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Offline EEVblog

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Re: New EEVblog BM786 Multimeter
« Reply #138 on: November 18, 2020, 11:19:23 pm »
Fuse replacement seems like a bit of a nuisance for such a recently designed multimeter:
8 screws to remove the front panel and battery compartment for access to both fuses.

Yes. That likely stems from design restrictions bought about by the decision to use the overmoulding to presumably look'n'feel like the Fluke 70 series.
 

Offline Fungus

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Re: New EEVblog BM786 Multimeter
« Reply #139 on: November 19, 2020, 06:04:34 am »
Fuse replacement seems like a bit of a nuisance

That's a good thing - teaches you to not blow fuses.  :-+
 

Offline Wytnucls

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Re: New EEVblog BM786 Multimeter
« Reply #140 on: November 19, 2020, 10:42:32 am »
It might happen more often than you think, with a 400mA fuse in a 60,000 count meter.
 

Offline 2N3055

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Re: New EEVblog BM786 Multimeter
« Reply #141 on: November 19, 2020, 11:35:31 am »
It might happen more often than you think, with a 400mA fuse in a 60,000 count meter.

It depends..

Since I have DP831 and UT210E , i haven't measured current with meter that often.
When I do, I alternate between Brymens and MTX3293 (that has only one current input), and use Metrix for current measurements at desk mostly because of that. Which means I usually have no source to blow 10A fuse.

On equipment that runs lead acid accumulators, I mainly use UT210E, mostly because I don't need absolute precision and no need to disconnect wiring..

I blew exactly 3 fuses in meters in 40 years... First one, 40 years ago, scared the bejesus out of me.. Since then I'm really careful about any current measurements...  Other 2 were measuring current on equipment connected to lead acid acccu, that while measuring drew too much current..

I also pretty much never rotate meter switch with voltage connected, even if I know it's perfectly safe.. I just have bad feeling in the stomach when I think about doing it...  What can I say, childhood traumas....  :-DD
 

Online joeqsmith

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Re: New EEVblog BM786 Multimeter
« Reply #142 on: November 19, 2020, 01:32:44 pm »
At least you don't have to then remove even more screws to pull the PCB to get at the fuses.   I tend to use other means to read current as well.   I've blown more fuses after I started looking at these handheld meters than in my entire life.   If a meter comes with glass, well, I can't resist watching them shatter.    :-DD
How electrically robust is your meter?? https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
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Offline Fungus

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Re: New EEVblog BM786 Multimeter
« Reply #143 on: November 19, 2020, 03:27:14 pm »
It might happen more often than you think, with a 400mA fuse in a 60,000 count meter.

What's the relationship between the two?

If anything, 60,000 counts should make it less likely to blow a fuse because you can work more in the amps range.
« Last Edit: November 19, 2020, 03:52:20 pm by Fungus »
 
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Offline rsjsouza

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Re: New EEVblog BM786 Multimeter
« Reply #144 on: November 19, 2020, 03:29:06 pm »
It might happen more often than you think, with a 400mA fuse in a 60,000 count meter.
Yes. Despite the price of HRC cartridges, I saw myself in the situation of occasional sudden spikes in current due to failures or shorts. All low-voltage electronics, but definitely enough to kill a 44/100.
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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 2N3055

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Re: New EEVblog BM786 Multimeter
« Reply #145 on: November 19, 2020, 03:55:35 pm »
It might happen more often than you think, with a 400mA fuse in a 60,000 count meter.
Yes. Despite the price of HRC cartridges, I saw myself in the situation of occasional sudden spikes in current due to failures or shorts. All low-voltage electronics, but definitely enough to kill a 44/100.
As I said, it highly depends on what you do.
MTX3293 has only one current socket and is designed to autorange from 1mA to 100A (20a constant) range at all times. It will also switch to current mode automatically if you plug cable in current socket. So to blow a fuse, you have to go over 20 for some time, or over 100A for a short time...
I quite like it...
 

Offline Wytnucls

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Re: New EEVblog BM786 Multimeter
« Reply #146 on: November 19, 2020, 04:11:37 pm »
It might happen more often than you think, with a 400mA fuse in a 60,000 count meter.

What's the relationship between the two?

If anything, 60,000 counts should make it less likely to blow a fuse because you can work more in the amps range.
The range is 600 mA, protected by a 400 mA fuse. Running 600mA for too long will blow the fuse eventually.

Notice that at 135% of its rated current a North American fuse must open
within one hour while an IEC fuse must be able to carry 150% of its rated
current for at least one hour
Cooper Bussmann
« Last Edit: November 19, 2020, 04:18:37 pm by Wytnucls »
 
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Offline bitseeker

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Re: New EEVblog BM786 Multimeter
« Reply #147 on: November 22, 2020, 10:19:18 pm »
I guess they assume you wouldn't be measuring at full scale for extended periods of time. Nevertheless, an interesting mismatch of values.
TEA is the way.
 

Online AVGresponding

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Re: New EEVblog BM786 Multimeter
« Reply #148 on: November 22, 2020, 10:46:18 pm »
I guess they assume you wouldn't be measuring at full scale for extended periods of time. Nevertheless, an interesting mismatch of values.

Especially when you consider that 630mA is a standard fuse value.
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Offline EEVblog

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Re: New EEVblog BM786 Multimeter
« Reply #149 on: November 22, 2020, 10:54:05 pm »
I guess they assume you wouldn't be measuring at full scale for extended periods of time. Nevertheless, an interesting mismatch of values.

Very common.
The Fluke 70 and 80 series are both 6000 count and use a 440mA fuse.
 
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