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Author Topic: Multimeter's rotary switch lubricant  (Read 1139 times)
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Signal
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« on: December 28, 2015, 04:52:44 16:52 »

My multimeter (Axiomet AX-105) after years of reliable work started to show incorrect unstable values of low resistance. The reason was - old lubricant over contacts of rotary switch.
After cleaning by alcohol a good contact is back and becomes even better than was new - typical 0.1 Ohm value of short circuit now is 0.0 almost all time.
But I think that purpose of lubricant is a protection of contacts from abrasion.
What is your experience or knowledge?
What kind of lubricant do you use as a replacement of aged one? Is it easy accessible?
Or do you simply leave it dry without further sad consequences?
« Last Edit: December 28, 2015, 04:58:43 16:58 by Signal » Logged

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solutions
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« Reply #1 on: December 29, 2015, 01:14:42 01:14 »

Any decent meter, including an old analog one with a galvanic movement, can be zeroed out and should be, for leads' and contacts' resistances.

That said, unless someone knows of something better, there's a conductive grease that typically is used to protect lead acid battery terminals from corroding and from acid exposure - I'm guessing that MAY work.
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Gallymimu
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« Reply #2 on: December 29, 2015, 04:09:11 04:09 »

The lubricants are often helpful in preventing corrosion as well as fretting. 

This can work for cleaning (but it sounds like you got it clean) http://www.amazon.com/CRC-05101-QD-Electronic-Cleaner/dp/B000CCMLD0

I think this might be what solutions is talking about http://www.alliedelec.com/mg-chemicals-846-80g/70125869/?mkwid=sabYU23qn&pcrid=30980760979&gclid=CNSTt4iNgMoCFQ9afgodXnQJPQ

But honestly I'd personally use non-conductive grease like a silicone / dielectric grease (http://www.adhesivecentral.com/cgi-bin/commerce.cgi?preadd=action&key=LT-37535-BP&gclid=CMTRy_KNgMoCFUWVfgodF1wBBA)

That said these are primarily used to exclude moisture and oxygen from the connection.  I've not seen grease used on the wiper contacts of any Fluke meters I've ever used.

Also bear in mind if the hard gold or hard tin coatings have worn off the wiper or PCB then it will be forever difficult to clean and keep working because contact abrasion and fretting will be more prevalent than it was when the original coatings were present.
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Signal
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« Reply #3 on: December 29, 2015, 04:13:25 16:13 »

Any decent meter, including an old analog one with a galvanic movement, can be zeroed out and should be, for leads' and contacts' resistances.
If shorted Ohmmeter indicates form 2 to 120 Ohms depending on light touches to the switch knob and indication changes in time itself that is not the case for trimming/zeroing.

That said, unless someone knows of something better, there's a conductive grease that typically is used to protect lead acid battery terminals from corroding and from acid exposure - I'm guessing that MAY work.
Conductive grease spread over dielectric surface of board between exposed contacts looks irrelevant. I am pretty sure - it is not applicable here.
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dR-mR
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« Reply #4 on: December 30, 2015, 12:21:47 12:21 »

I used that lubricant for my old multimeter without problems
http://www.wurth.co.uk/technical-chemicals/lubricants-and-rust-removers/lubricating-grease/hhs-grease-400ml
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Signal
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« Reply #5 on: December 30, 2015, 01:13:11 13:13 »

I used that lubricant for my old multimeter without problems ...
I suppose that you use one from reserves on your shelf. How long do you use the multimeter after application of that lubricant?
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dR-mR
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« Reply #6 on: December 30, 2015, 01:34:59 13:34 »

3 or 4 months.
I gave the multimeter to a friend he works with car electronics, i think he still use the multimeter.
The lubricant i got from the same friend
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sotos234
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« Reply #7 on: January 02, 2016, 09:43:37 09:43 »

Silicone Dielectric Grease is preferred.
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Mega32
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« Reply #8 on: January 03, 2016, 07:47:13 19:47 »

Use Caig Deoxit

See TechNote 012 from Kron-Hite (They make serious references, based on dial wheels)
http://www.krohn-hite.com/htm/technotes/technical_note.htm#Technical%20Note%20#012

Caig DeoxIT D5 for cleaning
http://store.caig.com/s.nl/it.A/id.1602/.f

Note PreservIT is now : DeoxIT® Shield , for lubricant after cleaning
http://store.caig.com/s.nl/sc.2/category.192/.f

Nice reading about the productlines
http://store.caig.com/s.nl/it.I/id.22/.f

Mega32
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zac
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« Reply #9 on: January 03, 2016, 10:38:24 22:38 »

I have had good results with Cramolin (now called Deoxit) products:

http://store.caig.com/s.nl?sc=1&category=&search=cramolin

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mylogin
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« Reply #10 on: January 31, 2016, 06:08:40 06:08 »

Deoxit works great for my multi-meter rotary switch, phone jack, Ethernet jack, RF connector, and power adapter connector contact,  especially for old instrument switch contacts. --highly recommended.
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bobcat1
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« Reply #11 on: January 31, 2016, 09:31:56 09:31 »

Hi

I use this cleaner for contact clean for many years - proven to do the work

http://www.maplin.co.uk/p/servisol-super-10-switch-contact-cleaner-200ml-jp17t

All the best

Bobi
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GroundPlaneLoop
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« Reply #12 on: February 05, 2016, 08:03:43 20:03 »

Isopropanol with a little white mineral oil works also good.
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