Products > Test Equipment
Brymen BM789
bdunham7:
--- Quote from: floobydust on September 20, 2021, 08:50:43 pm ---None of the asian design multimeters I can find are using a DC-blocking cap, except the BM869s.
--- End quote ---
My BK 391A definitely had a blocking cap and measured infinite DC impedance on ACV.
According to other tests here, the BM 78x series has a DC blocking cap as well for ACV above the mVAC range.
floobydust:
BM789 - I don't see a DC blocking cap in any PC board photos.
bdunham7:
--- Quote from: floobydust on September 20, 2021, 10:43:27 pm ---BM789 - I don't see a DC blocking cap in any PC board photos.
--- End quote ---
You have to give the Dave credit for posting photos of the guts--not too many manufacturers do that anymore.
I also had a hard time with that, although I think it is likely to be the lower of the two components I have rectangled here:
joeqsmith:
Look close and you may notice the part designator for the larger component shows R. I believe this is one of the shunts but to be clear, I have not spent any time trying to trace it out.
bdunham7:
--- Quote from: joeqsmith on September 21, 2021, 02:22:05 am ---Look close and you may notice the part designator for the larger component shows R. I believe this is one of the shunts but to be clear, I have not spent any time trying to trace it out.
--- End quote ---
I did see that designator originally, but without one in hand its hard to know if it means the white rectangular thing that looks a lot like a capacitor or not. I don't know where else it could be except perhaps up masquerading as a PTC. I doubt they'd let high voltage get up north of that switch anywhere. I do see a C1 on the back that looks to be in the right spot, but it looks too small? Perhaps SMT HV capacitors are more advanced than I know.
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