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BM789 continuity behaviour

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giosif:

--- Quote from: mwb1100 on September 03, 2023, 05:52:02 pm ---FWIW (probably not much), I cannot reproduce this behavior with a BM786 that I bought from welectron 1 year ago.

--- End quote ---
Thanks for checking!
That's good to know, since the BM786 is part of the same series as the BM789.

I have contacted Brymen about this issue; let's see what they say.
In the meantime, anyone else owning a BM789, could you please test and report here, so we understand how widespread this problem is?

Electro Fan:

--- Quote from: giosif on September 03, 2023, 12:10:20 pm ---Just adding another observation I've just made (again, with the BM789 in continuity mode): if I hold one of the probes in my hand (touching the metal part) and I touch the other probe to a piece of metal somewhere in my lab (I've used the boom stand of my microscope for this test), I also get the short beep.

--- End quote ---

I haven't read this whole thread but my 789 doesn't do that.

Caliaxy:
My 789 does something similar, too: random very short beeps when touching metal parts of various equipment with only one probe (the other probe in the air). Looks like some static charge pick-up - touching repeatedly the same metal part does not result in multiple beeps; you have to wait a bit or touch something else before being rewarded with a new beep. Not sure what to make of it...

Haven't noticed it (and it never bothered me) until reading this post. Thank you, Mr. giosif :)

Bought from Welectron in 2001.

giosif:

--- Quote from: Caliaxy on September 03, 2023, 08:41:16 pm ---[...]
Haven't noticed it (and it never bothered me) until reading this post.
[...]

--- End quote ---

To be clear, the behaviour on its own doesn't bother me; what does, though, is its impact on being able to use the meter's continuity function to trace connections in a circuit.
In other words, because of all these beeps I get when placing the probes on points which are not actually directly connected, I have to keep the probes in a given location long enough until the beep stops, before I can determine there is no connectivity and can move on to the next location.
And this is no better than having a multimeter with a slow response time in continuity mode.

Have you used your BM789 for this purpose?

Caliaxy:

--- Quote from: giosif on September 03, 2023, 09:10:21 pm ---And this is no better than having a multimeter with a slow response time in continuity mode.

--- End quote ---
True.


--- Quote from: giosif on September 03, 2023, 09:10:21 pm ---Have you used your BM789 for this purpose?

--- End quote ---
Not that much, it's not my primary meter. I actually tend to avoid it, for reasons other than this one (now I have one more reason...)

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