[volt-nuts] Best cleaning procedure for precision cirquits

[Randy Evans]

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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