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Brymen BM789

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joeqsmith:

--- Quote from: Fungus on September 15, 2021, 01:32:37 pm ---187 is even better - same meter but no pesky supercap to worry about.

--- End quote ---

I have replaced the SC on all four meters.  No big deal. 


--- Quote from: 2N3055 on September 15, 2021, 01:05:00 pm ---If they would restart making F189, that one I would buy right away.
If I was lucky to have bought one before, when available, I would still have it and keep it.
But I have no appetite for lottery of buying used.

--- End quote ---

Same.  Maybe a better display and handle the part obsolescence is all.   

The one on the right was given to me by a good friend.  I'm the third owner.  The one on the left cost me about $120 non-working as is for parts.   Bought it to transient test.  It turned out to be in very good of condition and felt it would upset the Fluke collectors if I put a classic meter into an early grave.  :-DD   The last one I brought home was a similar story.  Bought it as non-working as is. It's case looked mint which is why I bought it.  I think $60 which seemed fair for good used case.  But when I opened it up,  it was mint inside as well.  I have no plans to buy another no matter how good the deal seems so I'll pass my 189 finders luck onto you. 

bdunham7:

--- Quote from: 2N3055 on September 15, 2021, 08:15:29 am ---That is summary.

--- End quote ---

Looks right, just the facts.  Which I think is what the OP was looking for.  Nobody replicated his specific test, but it seems clear that his issues are primarily because of the design.  And until this thread I didn't know that the mVAC range on my own F116 is also DC-coupled, although none of the other issues affect it.


--- Quote ---But I have no appetite for lottery of buying used.

--- End quote ---

And some have no appetite for the lottery of buying new!  ^-^

Caliaxy:

--- Quote from: AndrewBCN on September 15, 2021, 07:50:01 am ---I don't have a 87V either but I can read (the online user manual): the Hi-Res mode does not work with the ACV ranges.

--- End quote ---

Not true.



joeqsmith:
Vintage 1980's Fluke 8506A thermal RMS meter I saved from scrap.  Its set to high accuracy mode and shown with an external blocking capacitor.    My new 87V in high res mode.  Signal is a little closer to the 20mV noise mentioned above, with 800VDC offset.

Eventually the MOVs would clamp the input and we limit the current but I wonder if these caps would survive....  I'll stick with my old habits of using an external block.   It does look a bit scary hanging out there though...  :-DD 

AndrewBCN:
@Joe

That external blocking capacitor looks like it could hold a lethal amount of energy!

The question is, on the DMMs that use an internal blocking capacitor, how do they discharge it before you go on to the next measurement?

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