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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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