Products > Test Equipment

Brymen BM789

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Neutrion:

--- Quote from: mwb1100 on September 29, 2023, 08:30:08 am ---

The following Brymen meters have 20/second update in REC (aka MAX/MIN) mode (not a comprehensive list):

  - BM257s
  - BM525s
  - BM817s (Amprobe AM-270)

The 20/second display update isn't really useful as far as the display goes - if the numbers are changing fast, they're just a blur - better to look at the bargraph.  Of course, the important thing is it helps ensure that the meter will catch very short MAX & MIN durations.


--- End quote ---
The 10/s update on the BM789's display is not a blur, but "well" readable, so it could be useful sometimes when the baragraphs resolution is not enough.


--- Quote from: mwb1100 on September 29, 2023, 08:30:08 am ---
As far as busting the 87V, I'd say "not so fast"!  The 87V's default MIN/MAX record rate is 100ms (10/second), just like the BM789.  It's just that it doesn't update the digital display any faster (the min/max is taken from the bargraph reading).

Also, the Fluke 87V and many of the Brymens support a "Peak" or "Crest" mode where the min/max is captured for very short transients (0.25ms for the 87V and 0.25ms-5ms for the Brymens depending on the model).  In this mode the display doesn't update continuously - it shows the MAX or MIN value (whichever you select)


--- End quote ---

The BM789's manual doesnt say anything about the different display update rate, but in REC mode it says the signal duration must be DC 300ms AC 460ms and there is the nominal update rate mentioned, I suppose for the measurement. Because it is 10 for AC but the display stays at 5/sec.
Crest mode says 0,35 ms signal duration. But it goes a bit lower.
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.

But anyway in display update the BM789 beats the Fluke, also in normal mode and in baragraph wiev  ;D

joeqsmith:

--- 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.

mwb1100:

--- Quote from: Neutrion on September 29, 2023, 10:14:24 am ---The 10/s update on the BM789's display is not a blur, but "well" readable, so it could be useful sometimes when the baragraphs resolution is not enough.

--- End quote ---

You're right that the 10/second update isn't too bad.  I found the meters with 20/second update were just a blur when things were changing.


--- Quote from: Neutrion on September 29, 2023, 10:14:24 am ---The BM789's manual doesnt say anything about the different display update rate, but in REC mode it says the signal duration must be DC 300ms AC 460ms and there is the nominal update rate mentioned, I suppose for the measurement. Because it is 10 for AC but the display stays at 5/sec.

--- End quote ---
I only verified that the nominal update rate of 10/second in the table for DCV seemed to match up with what I saw and I then assumed that the REC update rates in that table for other modes would match the display updates in REC mode.  But I didn't actually test anything other than DCV (in particular the 10/second the table also shows for ACV).  Just goes to show that you have to verify everything!

Neutrion:

--- 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?


--- Quote from: mwb1100 on September 29, 2023, 05:03:28 pm ---
I only verified that the nominal update rate of 10/second in the table for DCV seemed to match up with what I saw and I then assumed that the REC update rates in that table for other modes would match the display updates in REC mode.  But I didn't actually test anything other than DCV (in particular the 10/second the table also shows for ACV).  Just goes to show that you have to verify everything!



--- End quote ---


If you have an another FW than 08 you could test whether it may gives you 10/sec with AC as well. But I don't think it will.  Maybe with a faster changing higher than 50Hz sine wave?

mwb1100:

--- Quote from: Neutrion on September 30, 2023, 01:23:05 pm ---If you have an another FW than 08 you could test whether it may gives you 10/sec with AC as well. But I don't think it will.  Maybe with a faster changing higher than 50Hz sine wave?

--- End quote ---

Mine (BM786) is also FW 08. I'm sure your observations are correct (also I'm fine with 5/sec update).

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