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| BM789 continuity behaviour |
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| Electro Fan:
--- Quote from: Caliaxy on September 03, 2023, 08:41:16 pm ---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. --- End quote --- OK, this thread has me testing more. Mine does the same as Caliaxy describes: 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. I can reproduce this ^ . Not sure what the interval is between no random beep and a random beep but sometimes it seems less than a minute. I have tried various combinations (meter off/on, replugging leads, etc) to find the pattern and interval but so far it just seems like a random beep and a random discharge. In one instance I found that just plugging in the red lead caused a beep. In typing this for about 2 minutes I had the meter off. When I turned it on and touched just the black lead to an Arduino component I got a beep; within a couple seconds I pulled the black lead off and touched it with my fingers and got another beep. 2 minutes later after more typing I just touched the black lead with my finger and got a beep. Half a minute more typing and no beep from touching either lead. Another half a minute of typing and a beep touching the black lead with a finger. Another half minute of typing and no beep from touching either lead with a finger. Another 30 seconds and no beep from a finger touch, but a beep from just touching the black lead to an Arduino circuit. Red lead doesn't seem to be beep happy. In exploring this rabbit hole I tested the leads for resistance with a 4 wire meter and didn't find anything surprising. However, in an effort compare the leads to other leads I found that while most pairs show the same resistance on the black and red leads, one of my Fluke 175 pairs shows that one lead has about twice the resistance of the other. If it isn't one rabbit hole it's another. (After some more typing the black lead touched to an Arduino component gives a beep, followed by silence for about a minute, followed by another beep when touched to the Arduino circuit. Then silence from any type of touch for about a minute.) Edit: After owning the 789 for couple years or so and using it along side various other meters, I'd say that for anything other than continuity I think it is an accurate and robust meter - but it seems that in continuity mode it's a tad overly sensitive and and sometimes goes into "listen to me and look at me" mode. - After sitting here for several minutes and getting no beep I turned it off and on. Then touched an Arduino component with the red lead and got no beep, but within a couple seconds touched the black lead to the same component and got a beep. |
| Electro Fan:
As per the attached images, these behaviors seem pretty consistent. Maybe this can help someone better diagnose what's happening. |
| Electro Fan:
Maybe grasping further at straws but when checking continuity with the Fluke 179 you can get a beep between the VOUT and the INPUT to repeat after about 10 seconds (or sometimes less). With the Brymen 789 you can get a beep to repeat in about 3-4 seconds. Edit: Or maybe not; my theory was that the Brymen is more sensitive to something but I can't confirm it - test results are too random. |
| sonpul:
It seems to us that everything is allowed to us with a multimeter and we can demand everything. Despite the length of the wires and the huge interference when touching anything. I can also call a short beep to something massive or a component on a PCB. I call a lot and often during the repair of devices, but this behavior has never interfered strongly. I perceive it as the behavior of a living organism or a feature of the character of a work partner. |
| giosif:
--- Quote from: sonpul on September 04, 2023, 07:33:17 am ---It seems to us that everything is allowed to us with a multimeter and we can demand everything. Despite the length of the wires and the huge interference when touching anything. I can also call a short beep to something massive or a component on a PCB. I call a lot and often during the repair of devices, but this behavior has never interfered strongly. I perceive it as the behavior of a living organism or a feature of the character of a work partner. --- End quote --- Do you own a BM789? If yes, how often have you used it in continuity mode to trace circuits? |
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