Products > Test Equipment
Brymen BM789
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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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