| Electronics > Repair |
| BM786 burden current fault |
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| brewster:
To save confusion I note that I'm not using the Brymen leads (which I have otherwise found excellent) but my own constructed cables. I have tried to exclude the leads from consideration by switching two other meters into the same cabling setup and finding no problem with them. It was only after I changed the fuse in the BM786 that the problem went away. Of course, it is hard to vary one part of a setup without affecting other parts. I have not completely excluded the possibility of an intermittent fault in the leads, but if the problem recurs I will replace the entire cabling setup and retest. |
| EEVblog:
--- Quote from: brewster on August 22, 2024, 05:42:55 am ---To save confusion I note that I'm not using the Brymen leads (which I have otherwise found excellent) but my own constructed cables. I have tried to exclude the leads from consideration by switching two other meters into the same cabling setup and finding no problem with them. It was only after I changed the fuse in the BM786 that the problem went away. Of course, it is hard to vary one part of a setup without affecting other parts. I have not completely excluded the possibility of an intermittent fault in the leads, but if the problem recurs I will replace the entire cabling setup and retest. --- End quote --- In that case, as above, visual inspection of PCB and joints. But I wouldn't rule out a mechnically dodgy fuse either. |
| brewster:
Solved - I think! To recap, I found that popping in a different fuse seemed to remove the problem. I also found that the original fuse was immune to much sharper treatment than the modest movement that would upset the meter when that fuse was installed. That doesn’t make much sense, except as suggested by a couple of replies it points to a mechanical fault. I decided to replace the fuse again because the one I put in there as a temporary measure is likely to be a fake. Then I noticed that one end of the fuse holder does not make firm contact with the fuse. A gentle bending closer together seems to have fixed it. Thanks all for assistance. |
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