the new multimeters with conductance measure are 87V and 189. No one fits the
100 EUR range by far, but I can buy an used 80-series one, they are very
cheap and I can bring them on the field while I would like to let the 34401A
in the lab. I saw the 8060A resultion is only 0.1nS; I cannot find
the specs of
the 8050A (neither the user's manual). Which one do you suggest?
I think any Fluke with an LSD of 0.01nS would be fine. Some (like
the 8050A) have full-range counts of 2000 (50M ohms), others have
full-range counts of 4000 or 6000 (25M ohms and 16.7M ohms,
respectively), which wouldn't make any difference for this
application (5G ohms is 20 counts with an LSD of 0.01nS). It may
matter for other uses you find for the meter.
I'd say decide first whether you want a battery-only handheld (I have
an 87 Series III) or a portable like the 8050A (line operated -- some
have a battery option, but if that is important to you you're
probably better off with a handheld). I bought 4, 8050As in 1981,
and they have all been perfectly trouble-free this whole time and are
still about 10x better than their specs on all functions (they are
checked annually but have never been adjusted). The same is true of
the 87-III, which I've had since 1997. The 8050As have had easy
lives as bench instruments, while the 87-III has been treated
respectfully but has been bumped around a fair amount -- up and down
dozens of towers and through hundreds of utility tunnels and
inspection hatches on a belt clip, sometimes in inclement weather or
noxious environments.
Fluke 8050A manual: <http://assets.fluke.com/manuals/8050a___imeng0200.pdf>
Fluke 80 Series III
manual: <http://assets.fluke.com/manuals/8xiii___umeng0500.pdf>
Best regards,
Charles
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