Products > Test Equipment
Brymen BM789
joeqsmith:
Now that it is clear you are adding a DC offset, none of what you wrote surprises me. At first I thought it was the wrong tool for the job but not posting your requirements, it seems you're just playing around with your new toy. Most of the responses here seem correct.
Fungus:
--- Quote from: Neutrion on September 14, 2021, 11:40:24 am ---AC V scale correct display: 2,5-2,7 V(STdev on Siglent) which is correct, mV scale: 650mV
--- End quote ---
When I teach my basic multimeter class I always tell them to use the 10A input jack for measuring current and only move to the mA input jack if they've seen a signal too small to measure properly on the 10A scale.
The same reasoning applies here too. mV/mA ranges are designed for sensitivity, not to handle overloads.
--- Quote from: joeqsmith on September 14, 2021, 12:28:07 pm ---Now that it is clear you are adding a DC offset, none of what you wrote surprises me.
--- End quote ---
You've done several similar tests on bigger scale, adding hundreds of volts of offset on the ACV scale. Many meters fail to handle it gracefully.
--- Quote from: joeqsmith on September 14, 2021, 12:28:07 pm ---it seems you're just playing around with your new toy.
--- End quote ---
Which is fine! It's good to know the limitations of the tools we own, playing is a good way to find them.
joeqsmith:
--- Quote from: Fungus on September 14, 2021, 12:49:45 pm ---
--- Quote from: joeqsmith on September 14, 2021, 12:28:07 pm ---Now that it is clear you are adding a DC offset, none of what you wrote surprises me.
--- End quote ---
You've done several similar tests on bigger scale, adding hundreds of volts of offset on the ACV scale. Many meters fail to handle it gracefully.
--- End quote ---
I certainly have and in cases where the meter doesn't want to switch to the next range, it makes for a less than impressive review. I was glad Brymen's engineers were able to sort it out before the meters release.
The BM789 is not a bad little meter. Add a few changes like split display and I think I would have a new favorite. Considering the abuse that both BM869s have seen and their continued trouble free service, its proving to be more difficult to find something I would take over them.
Neutrion:
--- Quote from: joeqsmith on September 14, 2021, 12:28:07 pm ---Now that it is clear you are adding a DC offset, none of what you wrote surprises me. At first I thought it was the wrong tool for the job but not posting your requirements, it seems you're just playing around with your new toy. Most of the responses here seem correct.
--- End quote ---
So do you agree with the others, that there is no way of showing the overload under these circumstances?
Does this happen with every major brand with similar funcions?
Playing: Yes, it is not smart to start using a meter or tool if you are not avare of its limitation, or functions so I am just playing. But watched you playing with the 786 before I bought it :)
Thats why I was curious of your oppinion.
--- Quote from: Fungus on September 14, 2021, 12:49:45 pm ---
--- Quote from: Neutrion on September 14, 2021, 11:40:24 am ---AC V scale correct display: 2,5-2,7 V(STdev on Siglent) which is correct, mV scale: 650mV
--- End quote ---
When I teach my basic multimeter class I always tell them to use the 10A input jack for measuring current and only move to the mA input jack if they've seen a signal too small to measure properly on the 10A scale.
The same reasoning applies here too. mV/mA ranges are designed for sensitivity, not to handle overloads.
--- End quote ---
I also do that with the 10A scale, or actually using a clamp meter if possible, and oviously generally not starting to use the meter on the millivolt scale but again, the problem is that measured values can change while one measures them, and even values in the mV range could suddenly change even dramatically, even if they are not supposed to. So I am only missing the overrange indication and asking whether it would really be impossible with the FW update to solve this, or it would require a major HW update.
But I start to have a feeling that what I wish for is something extraordinary :).
That is why I was curious how other meters (with a mV scale of course!) would perform here.
If we are talking about best practice, with the 789 it seems, that if one reads anything on the mV AC range higher than 500mV one should not trust those numbers, and constantly doublecheck it on an other scale, or in the dc range as well. Just as a sidenote. If no FW update is possible for this.
Neutrion:
--- Quote from: joeqsmith on September 14, 2021, 01:36:36 pm ---
I certainly have and in cases where the meter doesn't want to switch to the next range, it makes for a less than impressive review. I was glad Brymen's engineers were able to sort it out before the meters release.
The BM789 is not a bad little meter. Add a few changes like split display and I think I would have a new favorite. Considering the abuse that both BM869s have seen and their continued trouble free service, its proving to be more difficult to find something I would take over them.
--- End quote ---
This missing split display was for me the only major point why I could not decide for a while between the 789 and the 869. Is there any major technical reason they decided not to go that way?
Or is it that in some industrial application maybe the big numbers are the number one priority?
I also really like the warm white backlight, which is uniqe.
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