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Am I silly in even thinking about the 87-IV? Should I just get the 177 and upgrade later if I really do need better specs?
Most of what I have to say on meters is in this article:
How to Buy a Multimeter
...and in the forum threads linked from it.
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I don't really need the extra counts the 87-IV has over the 87-V
The thing about the 50,000 count Fluke meters is that they're 50,000 count meters full-time, no special modes. The 20,000 count 87's are 6,000 count meters in their default mode, and you have to switch them into a slower "HiRes" mode to get the 20,000 count readings. Lame.
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I have watched some videos about the 189/289 and those do look too big for a handheld
Well, realistically speaking, most electronic work is done with the meter propped up on the desk, not actually hand-held. Hand-carryable might be a more accurate term.
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If I had it all to do over I would have bought one of the Agilent hand helds with data logging instead.
There are traps in the data logging world, though, particularly with older designs, or current inexpensive ones.
First, most handheld instruments need special cables to get the data out, and they almost never come with the meter. If you need them, they're often $50-100. Modern bench instruments usually use commodity cabling or media: USB, Ethernet, CF cards, etc. Many handheld instruments tout "USB", but it's rare that there is actually a standard USB connector on the side of the meter.
Second, you may need special software to make use of the data logging feature. The meter provider will want to sell you a $$ software package for this. You may be able to find third-party freeware, but it will often have a poor UI. Bench meters and dedicated data loggers, on the other hand, will usually give you the data in some inherently open format like CSV, so you can use it directly in spreadsheets and other common data manipulation tools.
As a consequence of both these points, I've never bothered to use the data logging features in my Fluke 189, but I have several times with my Agilent 34410A.