[volt-nuts] Best cleaning procedure for precision cirquits

Sat Oct 9 08:38:23 UTC 2010

Hi,
Pure (99%+) IPA won't leave a residue. It my be dissolving dirt or a coating. For hermetic compounets a clean with dish washing soap and warm water in an ultrasonic cleaner, (followed by a second in fresh solution for very dirty parts), then de-ionised water and finally IPA is excellent.   If the components can stand it (metal, glass, teflon, epoxy) pure acetone is one of the best finishing agents. Don't leave it to soak though.
For non-ferrous metal parts add some ammonia solution to the first mix. 

Robert G8RPI.

--- On Sat, 9/10/10, Randy Evans <randallgrayevans at yahoo.com> wrote:

From: Randy Evans <randallgrayevans at yahoo.com>
Subject: Re: [volt-nuts] Best cleaning procedure for precision cirquits
To: jfor at quik.com, "Discussion of precise voltage measurement" <volt-nuts at febo.com>
Date: Saturday, 9 October, 2010, 4:04

I will be using teflon stadoffs but I am using range resistors from an old 
Keithley 414 Picoammeter that were very dusty and dirty and I need to clean them 
prior to using them again.  i did clean them with isopropyl alcohol but it left 
a residue on them that I want to clean off.

Randy

----- Original Message ----
From: J. Forster <jfor at quik.com>
To: Discussion of precise voltage measurement <volt-nuts at febo.com>
Sent: Fri, October 8, 2010 6:23:36 PM
Subject: Re: [volt-nuts] Best cleaning procedure for precision cirquits

Picoamp stuff is usually done with Teflon standoffs or guarded PCBs,
preferably the former.

FWIW,

-John

===============

> Separate from cleaning flux off a board, what is the best solvent/cleaning
> agent for removing dirt and grime from a board and compnents for the
> lowest
> leakage currents; e.g., for a picoamp measurement system with very high
> value
> reistors?
>
> Thanks,
>
> Randy Evans
>
>
>
> ----- Original Message ----
> From: Chuck Harris <cfharris at erols.com>
> To: Discussion of precise voltage measurement <volt-nuts at febo.com>
> Sent: Mon, September 27, 2010 3:18:27 PM
> Subject: Re: [volt-nuts] Best cleaning procedure for precision cirquits
>
> I don't like denatured alcohol.  They add a little methyl
> alcohol, which is very poisonous for skin contact, ingestion,
> and breathing.  Also, it is rather corrosive.... and worst of
> all, it leaves behind a white powder when it dries.
>
> If you really want to use ethanol (the base for denatured alcohol),
> buy it from the liquor store.
>
> Aerosol cans of "compressed air" are really filled with anything
> but air.  They used to be filled with freon, and then later butane,
> NO2, and finally CO2.
>
> -Chuck Harris
>
> Andreas Jahn wrote:
>> Hello all,
>>
>> thanks for the many informations and proposals.
>>
>>> From Your proposals I think the most interesting for my capabilites
>>> are:
>>
>> - the isopropylene alcohol
>> - and the "Kontakt LR" cleaner
>>
>> both for the last (3rd?) cleaning stage since the denatured alcohol is
>> much cheaper.
>>
>> And I have learned that I should get some aerosol cans with compressed
>> air for drying the cirquit.
>>
>> with best regards
>>
>> Andreas
>>
>>
>>
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