I've read that ethanol, specifically not the denatured type, makes a good cleaning fluid for precision electronics. In the US this can be purchased as 'everclear' in very high proof values in liquor stores. The added bonus is if you ruin your instrument, you don't have to go anywhere. You have a supply of liquor on your bench! Anyway, this may be worth reading about... Dan On 6/25/2019 12:00 PM, volt-nuts-request@lists.febo.com wrote: > Message: 1 > Date: Tue, 25 Jun 2019 12:50:49 +0100 > From: "Dr. David Kirkby"<drkirkby@kirkbymicrowave.co.uk> > To:"volt-nuts@lists.febo.com" <volt-nuts@lists.febo.com> > Subject: [volt-nuts] How should I clean a 400 k ohm resistor? > Message-ID: > <CANX10hBMDyG1gmPXXU7eTiEemrD5_iJR5fvwkPA1mPgNkr-QwA@mail.gmail.com> > Content-Type: text/plain; charset="UTF-8" > > I want to change a 400 k ohm through hole resistor in a HP 34970B data > acquisition unit > > https://www.keysight.com/en/pd-1000001313%3Aepsg%3Apro-pn-34970A/data-acquisition-data-logger-switch-unit > > The resistor is only 1% tolerance, but has a temperature coefficient is 2 > ppm/deg C. Once the instrument is calibrated, changes in the value of this > resistor will mess up the resistance measurements on the data acquisition > unit. > > What is the best way to fit the resistor in such that there are not any > avoidable changes in value? > > I did think of cleaning the resistor with IPA once it Is soldered in, but > IPA readily absorbs water, so I am concerned IPA this will leave residual > around. > > Dave.