Products > Test Equipment
Saving yet another Fluke 189
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joeqsmith:
Picked up a cheap, dead, Fluke 189.  The plastic is in poor condition.  Looks like it was dipped in chemicals and abandoned.  I suspect this weakened the plastic and it there are a lot of cracks and chips.   I have a 189 I had bought dead for the purpose of transient testing.   A few of the plastics parts on that meter were in better condition, so I swapped them out.   All of the standoffs on the front cover were broke off and split.   I used an inverted cone cutter with the dremel tool to cut these down to a flat surface and inserted brass standoffs into them, which I then covered with heat shrink.  The ones towards the leads, I glued to the sidewall of the case.   I replaced the supercap and bad battery clips.  There was a small crack in the lens was all, so just some light polishing.     

joeqsmith:
Didn't get so lucky.  The terminal block was damaged as well.  All 4 pins for the common and voltage inputs were broke off.   For now, I stole the terminal block from my beat up meter until I can get a replacement.   The new meter is the one reading a count low.   Doing a basic checkout, it doesn't appear anyone tried to muck with the alignment. 
joeqsmith:
After posting about the instability problem I ran into with the 121GW, someone commented how the BM869s gives the wrong result for I assume ACmA (never heard of resistance voltage units).   

Showing the repaired 189 with the 789 and both BM869s meters.  None of these are in cal but suggests the new Fluke is alright.  Also that our viewer is clueless.  I would imagine if we used a signal with high frequency, they would read different.   Maybe they don't understand that.  I'm showing a 60Hz sinewave. 
joeqsmith:
Appears there are none of the OEM terminal blocks available.  There are two different red ones.   Has anyone purchased one of these?  Do they use rubber like the OEM parts?  Sealed?  Crap metal terminals from China?   

https://www.ebay.com/itm/234863848071

https://www.ebay.com/itm/265685003138
daisizhou:
Have you carefully checked and cleaned the 4 terminal blocks?
You must carefully clean the bottom of each terminal,It is recommended to soak with 95% ethanol after cleaning and rinse each terminal with a syringe.After all steps are completed, they must be dried and then checked to see if the data is consistent.
If there are still errors, follow the steps above and try again.

I think it makes no practical sense for you to replace 4 terminal blocks.
First of all, it is difficult to buy brand new terminal blocks, and secondly, counterfeit terminals are not as reliable as repairing old ones.
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