Products > Test Equipment
Saving yet another Fluke 189
daisizhou:
picture
bdunham7:
It entirely possible that the current OEM part is made in China. The old ones were apparently black while the new ones are red. The part is still used, AFAIK, in the 787B and 789 products. I can't find the one I got from Newark a while back, once I'm mobile again I'll dig it out. I'm pretty sure it was red. I see the two eBay sellers have pictures with slightly different appearance--the fluke-usa version doesn't have the machining marks the other one does. I'm assuming the Newark-sourced version, which is NLA through them, would not be counterfeit.
joeqsmith:
--- Quote from: daisizhou on September 10, 2023, 09:12:33 pm ---picture
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These do not appear to be the correct replacement for the 189. See the ebay links I provided.
--- Quote from: joeqsmith on September 10, 2023, 04:24:29 pm ---
--- Quote from: daisizhou on September 10, 2023, 01:09:22 am ---It has many imitations in China.
If you replace it without the original soldering material, there may be errors--I mean measurement deviation
--- End quote ---
Please provide references and details.
--- End quote ---
I was more curious about your comment about the original soldering materials. I doubt anyone is mixing solders or not soldering them in. My interpretation of what you wrote is that if the original solder is not used, it may cause errors. This is what I am asking for details on.
joeqsmith:
I mentioned I had stole the best parts from my worse meter to repair the new one. One of the things I stole was the rubber keypad. I noticed when I reinstalled the terminal block and functional tested it, only two of the buttons worked. It looks like what ever chemicals this was exposed to damaged the rubber contacts. :palm:
I had used some of MGChemicals conductive paint for some 3D printed microwave horns I was testing. I sprayed a small amount into the cap and used a toothpick to apply a small bead on the end of the rubber. Let it dry overnight. All of the buttons works fine again.
https://www.eevblog.com/forum/rf-microwave/experimenting-with-waveguides-using-the-litevna/msg4638982/#msg4638982
daisizhou:
The error I am referring to is that there may be deviations in the measured values.
As far as I know, the soldering material used in the original factory FLUKE 187/189 contains silver,And ordinary soldering tin rarely contains this silver material.
Another issue is that if the solder contains silver, its welding temperature will increase. If you replace the seat, you will find that the solder pad will become focal, which can also lead to measurement deviation.
So I generally do not recommend that everyone replace this seat themselves unless it is truly beyond repair
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