[volt-nuts] Best cleaning procedure for precision cirquits

[J. Forster]

Maybe a water wash with a drop of Dawn or the like in it, followed by
several distilled water rinses.

Are you sure your alcohol is clean? Try letting some evaporate on a mirror.

FWIW,

-John

===========

> 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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>>
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>
>
>
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