Products > Test Equipment
Brymen BM789
floobydust:
Weeks ago, I contacted Emerson/Greenlee about doing Brymen product service/repair and received no response.
The website can only give you an RMA # from a picklist of valid Greenlee products- so you can't enter anything alien.
Until I hear otherwise, it's a myth you can get Brymen anything in North America - sales and service or calibration.
My theory is they are locked out of the region due to contract with Brymen as an OEM.
1,117kg or 66 cartons is a lot of multimeters per the HTS code, on the container ship One Theseus. It ain't test leads lol.
joeqsmith:
--- Quote from: Neutrion on September 30, 2023, 01:23:05 pm ---
--- Quote from: joeqsmith on September 29, 2023, 01:52:02 pm ---
--- Quote from: Neutrion on September 29, 2023, 10:14:24 am ---...
JoeQSmith did once a test of the crest modes of some meters, unfotunately the BM789 was not there yet.
It would be a nice test to see how the meters behave with singe glitches, and different signal heights, especially in Amps mode.
...
--- End quote ---
I could repeat it with what ever meters I have. I think I had used a constant height and varied the pulse width. Because the meters all work differently, it's a manual process. Adding different signal amplitudes and modes would add a bit of time. Currently my office is a big mess with several projects going on. Maybe once things settle down we can set it up.
--- End quote ---
It would be great! Especially to know the blind time of the meters, or if the update rate is really only a few per seconds, so whether glitches close to eachoder pass through without getting catched.
So the waveform update per second basically. :)
I tried to find the mentioned video of yours without luck, can yan you tell which one it was?
--- End quote ---
I think I have ran it a few times. This was from about 8 years ago with the 87V.
https://youtu.be/UZPjG892C40?t=95
I was firing a one-shot and reducing the duration. The meters have to be reset so I am not sure what you are asking for with the blind time. Personally, I wouldn't have much use for feature. If I am looking at short pulses, I am most likely wanting more detail than what the meters can provide.
Neutrion:
Yes, this was it. Was it really one single pulse, so the scope was just stoped after it? As it seems on the right side of the screen as if another pulse was coming.
You mean by reset, to reset the screen I suppose?
What I meant that if the update rate 10 per sec doesn't mean screen updating, than it could mean that with two short impulses after each other with the second one bigger (so manual screen updating would not be necessary) if it is within 1/10 second of eachother, the second one could pass unnoticed.
I am interested in how rare single glitches might could go unnoticed under certain circumstances.
Or with tricky waveforms.
Like a VFD puts out a single burst of a PWM waveform with only a few squarewaves, which might won't get properly recognized. Or any of the waveforms you tested the RMS funcions with. This is where min/max, crest etc would be used with the meter, especially with higher voltages before getting a scope.
And of course if the 10/sec would be only screen update, maybe later firmwares got it right for AC as well.
joeqsmith:
--- Quote from: Neutrion on October 03, 2023, 02:16:16 pm ---Yes, this was it. Was it really one single pulse, so the scope was just stoped after it? As it seems on the right side of the screen as if another pulse was coming.
You mean by reset, to reset the screen I suppose?
--- End quote ---
I just watched it and indeed it is live data. For some reason I was thinking it was a one-shot. So, yes it is not a single pulse. Seems the 869s requires you to reset the meter to start a new measurement but maybe not. Again, I own a scope so this isn't something I would normally have a use for.
--- Quote from: Neutrion on October 03, 2023, 02:16:16 pm ---What I meant that if the update rate 10 per sec doesn't mean screen updating, than it could mean that with two short impulses after each other with the second one bigger (so manual screen updating would not be necessary) if it is within 1/10 second of eachother, the second one could pass unnoticed.
--- End quote ---
I would imagine some meters have hardware to do the peak detect but maybe not. I dare say the update rate of the CEM is much slower the pulse we are trying to measure.
--- Quote from: Neutrion on October 03, 2023, 02:16:16 pm ---I am interested in how rare single glitches might could go unnoticed under certain circumstances.
Or with tricky waveforms.
Like a VFD puts out a single burst of a PWM waveform with only a few squarewaves, which might won't get properly recognized. Or any of the waveforms you tested the RMS funcions with. This is where min/max, crest etc would be used with the meter, especially with higher voltages before getting a scope.
And of course if the 10/sec would be only screen update, maybe later firmwares got it right for AC as well.
--- End quote ---
That's where the scope come into play. Well, for me anyway. That old Fluke scope meter has been nice to have.
TDA1541AS2:
Hi all,
I just received my new BM789 DMM firmware V12.
In regards to the duty cycle function being within the mV setting, what would the upper voltage limit be for taking duty cycle measurements? Could I safely use it with mains voltages? 240VAC
Thanks,
Daniel
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