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Phil Hobbs Phil Hobbs is offline
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Default DMM banana jack inputs

On 06/21/2018 05:42 PM, Jeff Liebermann wrote:
On Thu, 21 Jun 2018 13:08:28 -0700 (PDT), wrote:

I've got a Fluke 189 DMM. The banana jack inputs are getting flaky.
With the probes or input pushed up or down they sometimes loose continuity.
I opened it up and looked at the solder joints... they look fine.
The banana jacks are encased in plastic so it's hard to see exactly.
I tried squeezing them in some, it's maybe a bit better, but no one
wants even a bit of flaky in their test gear. Any ideas? (about how I might
fix it.)


If the banana jacks really are intermittent, replacement are
available:
https://www.ebay.com/sch/i.html?_nkw=fluke+187+jacks
Judging by the number sold (247+105) it seems to be a common problem.

More Fluke parts, from Fluke:
https://www.ebay.com/sch/fluke-usa/m.html?_nkw=
Now we know what usually breaks on a Fluke meter.

Hints:
1. Beware of new and improved.
2. That which is most difficult to replace, is usually the problem.
3. When all else has been replaced, that which remains, no matter how
improbable, is the culprit.


Except that while replacing all that stuff, the real fault blew up
several of the replacements, so it's quite possible to replace
everything and still not fix it!

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net