Ok, my method of re-cleaning no-clean flux.... Use an electronic sonic tooth-brush going through a flux-cleaning solvent cycle, then, windex cycle, then, hot water cycle, then back to windex. Windex was chosen since it completely evapourates & take any water with it.
This was the only way I could completely remove any electrical effect left by the no-clean flux. Note that I was measuring effect in the micro-amp & nano-amp regions where battery powered circuits, eg-32Khz oscilators, super-low powered radio recievers, have a measurable effect. ______________________ Brian Guralnick Vergent Technologies Inc. 438 Brahms Ave. Dollard Des Ormeaux Quebec, Canada H9G 2S6 (514) 624-4003 [EMAIL PROTECTED] ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; <[email protected]> Sent: Friday, December 15, 2006 8:24 AM Subject: Re: [PEDA] "No-clean" flux leakage, was: (500V power supply) > Doesn't that imply a basic flaw in the system, ie, that there is no > clear method of removal? I'm gbuesssing that the "solution" (hahahha) > is out there, it's just a mtter of getting someone to fess up and > publish their method. > >>-----Original Message----- >>From: [EMAIL PROTECTED] >>[mailto:[EMAIL PROTECTED] On Behalf Of Brian Guralnick >>Sent: Thursday, December 14, 2006 5:01 PM >>To: Protel EDA Discussion List >>Subject: Re: [PEDA] "No-clean" flux leakage, was: (500V power supply) >> >>> And a bit of hard won experience. Avoid "no-clean" flux, it >>will leak >>> at high humidity. It is only to be used at less than 100 V. >>> >>> Regards, >>> --Paul >>> >> >>I've measured no-clean flux leakage variance with voltages as >>low as 2v. It was a regulated supply for a battery powered >>project & the no-clean flux was conducting a number of >>pico-amps which varied from day-day. I was only able to solve >>the problem after "massive" number of cleaning & scrubbing cycles. >>Even with visual analysis with a microscope, you could not >>tell the difference before & after the cleaning, and yet, >>there was a significant measureable difference in effect. >> >> >>______________________ >>Brian Guralnick >>Vergent Technologies Inc. >>438 Brahms Ave. >>Dollard Des Ormeaux >>Quebec, Canada >>H9G 2S6 >>(514) 624-4003 >>[EMAIL PROTECTED] >> >> >>----- Original Message ----- >>From: "Paul Heilman" <[EMAIL PROTECTED]> >>To: "Protel EDA Discussion List" <[email protected]> >>Sent: Wednesday, December 13, 2006 5:40 PM >>Subject: Re: [PEDA] 500V power supply >> >> >>> And a bit of hard won experience. Avoid "no-clean" flux, it >>will leak at >>> high humidity. It is only to be used at less than 100 V. >>> >>> Regards, >>> --Paul >>> >>> -----Original Message----- >>> From: [EMAIL PROTECTED] >>[mailto:[EMAIL PROTECTED] >>> On Behalf Of [EMAIL PROTECTED] >>> Sent: Wednesday, December 13, 2006 2:11 PM >>> To: [email protected] >>> Subject: Re: [PEDA] 500V power supply >>> >>> Oh, come on...Electrical leakage is leakage Brad. Creepage >>is a "cute" >>> term meant to apply specifically to surface leakage, but it's all >>> leakage, as in electrical current flowing unexpectedly through a >>> dielectric medium. (call it over if you like, it's still "thru" to my >>> physics eye.) That's one of the novel things that the IPC >>brings to the >>> table. Redefinition of basic physics into terms that can suit the >>> purposes of obsfucation...and of course profit by >>intellectual ownership >>> of originally US-citizen-owned information. >>> >>> For instance, when I designed an instrument for KLM a couple >>years ago >>> to (amongst other things) measure LEAKAGE from pin to pin on a >>> connector, the mode of transport under consideration was not leakage >>> across the air gap, but through the dielectric separating >>the contacts. >>> >>> It's my policy to leave the cute to the IPC, Altium's marketing >>> Goo-Roos, and the cabal of "shhhhh...don't tell anyone its >>just water". >>> >>> And yes, DC or AC, the critical value is the peak value. All >>AC is DC if >>> time passes slowly enough, and most DC is AC if you speed the clock a >>> bit. Peak values Carlos. That means not only what you >>expect, but what >>> might be. (Hence the engineering margins I spoke of earlier) >>> >>> Regards, >>> >>> aj >>>>-----Original Message----- >>>>From: [EMAIL PROTECTED] >>>>[mailto:[EMAIL PROTECTED] On Behalf Of Brad Velander >>>>Sent: Wednesday, December 13, 2006 4:37 PM >>>>To: Protel EDA Discussion List >>>>Subject: Re: [PEDA] 500V power supply >>>> >>>> I don't believe I have seen anyone else point out that the >>> spacing >>>>requirements are typically specified for DC (RMS). >>>>Any AC, pulses or spikes have to be suitably considered at >>their "peak" >>> >>>>values. That 'typically' bumps you up at least one voltage >>>>rating/spacing category. >>>> >>>> I would say that you really need to read IPC-2221 section 6.3, >>> as a >>>>minimum. >>>> >>>> Besides that there is a lot of other information from safety >>>>regulators like UL/CSA/EU/TUV, more specifically towards >>product safety >>> >>>>and power supply design. With the safety regulators it typically gets >>>>even more complex because they start taking into account >>environmental >>>>pollutants (humidity, dust or other particles which can >>compromise the >>>>spacing) and applying pollutant/environment categories. >>Andrew mentions >>> >>>>"leakage" and leakage has two forms. Leakage is typically through air >>>>or an air gap, "creepage" is across surfaces and is equally important >>>>in most cases. >>>> >>>>Sincerely, >>>>Brad Velander >>>>Senior PCB Designer >>>>Northern Airborne Technology >>>>#14 - 1925 Kirschner Road, >>>>Kelowna, BC, V1Y 4N7. >>>>tel (250) 763-2232 ext. 225 >>>>fax (250) 762-3374 >>>> >>>> >>>>-----Original Message----- >>>>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >>>>Sent: Wednesday, December 13, 2006 1:15 PM >>>>To: [email protected] >>>>Subject: Re: [PEDA] 500V power supply >>>> >>>> >>>>Exactly. Be careful that you don't think "ideally". Think instead >>>>cautiously. Cautious is wider spacing. Do not go under, as >>you will not >>> >>>>necessarily see any immediate problem, even though there may >>very well >>>>be a major problem. (leakage) >>>> >>>> >>>> >>>>____________________________________________________________ >>>>You are subscribed to the PEDA discussion forum >>>> >>>>To Post messages: >>>>mailto:[email protected] >>>> >>>>Unsubscribe and Other Options: >>>>http://techservinc.com/mailman/listinfo/peda_techservinc.com >>>> >>>>Browse or Search Old Archives (2001-2004): >>>>http://www.mail-archive.com/[email protected] >>>> >>>>Browse or Search Current Archives (2004-Current): >>>>http://www.mail-archive.com/[email protected] >>>> >>>> >>> >>> >>> This e-mail transmission and its attachments may contain information >>> from Avtron Manufacturing, Inc. that is proprietary, >>privileged and/or >>> confidential and is intended exclusively for the person(s) >>to whom it is >>> addressed. Any use, copying, retention or disclosure by any >>person other >>> than the intended recipient or the intended recipient's designees is >>> strictly prohibited. If you have received this message in >>error, please >>> notify the sender immediately by return e-mail and delete all copies. >>> >>> >>> ____________________________________________________________ >>> You are subscribed to the PEDA discussion forum >>> >>> To Post messages: >>> mailto:[email protected] >>> >>> Unsubscribe and Other Options: >>> http://techservinc.com/mailman/listinfo/peda_techservinc.com >>> >>> Browse or Search Old Archives (2001-2004): >>> http://www.mail-archive.com/[email protected] >>> >>> Browse or Search Current Archives (2004-Current): >>> http://www.mail-archive.com/[email protected] >>> >>> >>> >>> ____________________________________________________________ >>> You are subscribed to the PEDA discussion forum >>> >>> To Post messages: >>> mailto:[email protected] >>> >>> Unsubscribe and Other Options: >>> http://techservinc.com/mailman/listinfo/peda_techservinc.com >>> >>> Browse or Search Old Archives (2001-2004): >>> http://www.mail-archive.com/[email protected] >>> >>> Browse or Search Current Archives (2004-Current): >>> http://www.mail-archive.com/[email protected] >> >> >> >>____________________________________________________________ >>You are subscribed to the PEDA discussion forum >> >>To Post messages: >>mailto:[email protected] >> >>Unsubscribe and Other Options: >>http://techservinc.com/mailman/listinfo/peda_techservinc.com >> >>Browse or Search Old Archives (2001-2004): >>http://www.mail-archive.com/[email protected] >> >>Browse or Search Current Archives (2004-Current): >>http://www.mail-archive.com/[email protected] >> >> > > > This e-mail transmission and its attachments may contain information from > Avtron Manufacturing, Inc. that is proprietary, privileged and/or > confidential and is intended exclusively for the person(s) to whom it is > addressed. Any use, copying, retention or disclosure by any person other > than the intended recipient or the intended recipient's designees is > strictly prohibited. If you have received this message in error, please > notify the sender immediately by return e-mail and delete all copies. > > > ____________________________________________________________ > You are subscribed to the PEDA discussion forum > > To Post messages: > mailto:[email protected] > > Unsubscribe and Other Options: > http://techservinc.com/mailman/listinfo/peda_techservinc.com > > Browse or Search Old Archives (2001-2004): > http://www.mail-archive.com/[email protected] > > Browse or Search Current Archives (2004-Current): > http://www.mail-archive.com/[email protected] > ____________________________________________________________ You are subscribed to the PEDA discussion forum To Post messages: mailto:[email protected] Unsubscribe and Other Options: http://techservinc.com/mailman/listinfo/peda_techservinc.com Browse or Search Old Archives (2001-2004): http://www.mail-archive.com/[email protected] Browse or Search Current Archives (2004-Current): http://www.mail-archive.com/[email protected]
