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| BM786 Switch Issue |
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| Algoma:
Yes, and I'm defending the point that this was NOT caused by suicidal abuse of the multimeter. the issue was present within the first turn of the dial with no leads attached. This case was fully sourced from the manufacturer. I state clearly, that it is false, slanderous hearsay to claim that in this case the meter was abused, and the evidence hidden in this case. Dave's blade left far more scratches in his video than any other markings on that trace,. |
| bdunham7:
--- Quote from: joeqsmith on March 27, 2021, 10:33:03 am ---Interesting is that it would seem that this area of concern for you may actually be a way to improve the design of meters. Consider the attached picture showing the BM786 after completing a 50,000 cycle life test on the switch. Not Dave Jones 50K but full CW/CCW making one cycle. Or 100,000 DJ cycles. Notice in cases where the mask is removed in area around the contact's leading edge, we see some rounding off where in this case, we start with a smoother transition and less wear. --- End quote --- OK, from that angle I can see how the traces intersected and I see the worn triangle of soldermask on the life-cycle tested meter. |
| joeqsmith:
--- Quote from: Algoma on March 27, 2021, 10:00:21 pm ---Yes, and I'm defending the point that this was NOT caused by suicidal abuse of the multimeter. the issue was present within the first turn of the dial with no leads attached. This case was fully sourced from the manufacturer. I state clearly, that it is false, slanderous hearsay to claim that in this case the meter was abused, and the evidence hidden in this case. Dave's blade left far more scratches in his video than any other markings on that trace,. --- End quote --- I have made no false claims about what happened to your specific meter. I have stated multiple times that I would have no way of knowing. --- Quote from: joeqsmith on March 17, 2021, 12:19:52 pm ---"... and it's in ohms range so you would never get high enough current passing through the uh input protection resistors here and the PTCs to cause some sort of ridiculous you know arching of like a across that contact. Its just its just not possible" At the rated voltage (1KV) it certainly is possible to draw an arc large enough to damage the contacts. I had made a video to demonstrate this after anther member had damaged a 121GW. While you should never rotate the function switch with the meter connected to an active circuit, a few of us have bad habits. Mix that with a little HV..... --- End quote --- What I have done is conducted a simple test to see if the original statement from the video was true or not and presented my findings. I'm sorry that makes you become defensive. It shouldn't. |
| Algoma:
@joeqsmith I do apologize. Your work and testing is valuable to the community, and this in depth investigations indeed this shows what types of damage can occur to a meter if mishandled. Thank you for all the work you put into testing these meters. |
| joeqsmith:
--- Quote from: bdunham7 on March 27, 2021, 11:52:14 pm --- --- Quote from: joeqsmith on March 27, 2021, 10:33:03 am ---Interesting is that it would seem that this area of concern for you may actually be a way to improve the design of meters. Consider the attached picture showing the BM786 after completing a 50,000 cycle life test on the switch. Not Dave Jones 50K but full CW/CCW making one cycle. Or 100,000 DJ cycles. Notice in cases where the mask is removed in area around the contact's leading edge, we see some rounding off where in this case, we start with a smoother transition and less wear. --- End quote --- OK, from that angle I can see how the traces intersected and I see the worn triangle of soldermask on the life-cycle tested meter. --- End quote --- You can see how this leading edge can cause problems. I think you may be onto something. Then again, when we look at the Fluke 87V (damage 2), we can see how the design of the wiper contact can also have an effect on wear. There is an art to getting the switch right. |
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