Groups > sci.electronics.design > #519142

Re: guard ring?

From	DecadentLinuxUserNumeroUno@decadence.org
Newsgroups	sci.electronics.design
Subject	Re: guard ring?
Date	2018-10-13 09:11 +0000
Organization	Aioe.org NNTP Server
Message-ID	<ppscr9$145q$1@gioia.aioe.org> (permalink)
References	<t422sdt4ht4vg7m40fqvvgfn20i6pala5r@4ax.com> <ppr5sh$3mq$1@dont-email.me> <b782sdhv8gtok4b8br9pjpik68m6rf15qt@4ax.com> <ppre16$cpu$1@dont-email.me> <pprker$6d5$1@dont-email.me>

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"Tim Williams" <tiwill@seventransistorlabs.com> wrote in
news:pprker$6d5$1@dont-email.me: 

> Hot air machines are super cheap, and don't melt anything but what
> they're pointed at.  Assuming the only thing melting is solder. 

With PCBs that have heavy via and high via counts near heavy parts even a 
single hot air jet can be detrimental to a board.

  Bringing the entire assembly up in temperature OVER ambient means less 
thermal WORK has to be done to do the job, AND less overall stress occuurs 
on the whole thing.

  One brings the entire assembly temp up (at least the area surrounding the 
rework location), THEN use a direct hot air jet to reflow the part.

  They have benchtop setups for this.

http://www.zeph.com/

Thread

guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-12 14:01 -0700
  Re: guard ring? TTman <kraken.sankey@gmail.com> - 2018-10-12 23:06 +0100
    Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-12 15:38 -0700
      Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-12 19:26 -0500
        Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-12 21:16 -0500
          Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-13 09:11 +0000
            Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-13 04:51 -0500
              Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-13 09:58 +0000
      Re: guard ring? George Herold <gherold@teachspin.com> - 2018-10-12 18:12 -0700
    Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-13 00:02 +0000
  Re: guard ring? <698839253X6D445TD@nospam.org> - 2018-10-13 06:59 +0000
  Re: guard ring? Robert Baer <robertbaer@localnet.com> - 2018-10-13 22:45 -0700
    Re: guard ring? John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-14 09:44 -0700
      Re: guard ring? John S <Sophi.2@invalid.org> - 2018-10-14 12:45 -0500
        Re: guard ring? krw@notreal.com - 2018-10-14 14:28 -0400
      Re: guard ring? Jasen Betts <jasen@xnet.co.nz> - 2018-10-14 19:28 +0000
        Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-14 20:57 +0000
          Re: guard ring? Jasen Betts <jasen@xnet.co.nz> - 2018-10-15 05:20 +0000
            Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-15 10:59 +0000
      Re: guard ring? "nuny@bid.nes" <alien8752@gmail.com> - 2018-10-14 17:39 -0700
  Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-14 14:56 -0700
    Re: guard ring? <698839253X6D445TD@nospam.org> - 2018-10-15 07:23 +0000
    Re: guard ring? <698839253X6D445TD@nospam.org> - 2018-10-15 07:54 +0000
      Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-15 11:21 +0000
        Re: guard ring? John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-15 07:52 -0700
  Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-16 10:31 -0700
    Re: guard ring? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-16 14:23 -0400
    Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-16 17:09 -0500
      Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-16 16:02 -0700
        Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-17 03:57 -0500
          Re: guard ring? John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-17 04:52 -0700
      Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-17 11:00 -0700
        Re: guard ring? Steve Wilson <9fe142ac@gmail.com> - 2018-10-17 12:13 -0700
        Re: guard ring? Steve Wilson <9fe142ac@gmail.com> - 2018-10-17 12:19 -0700
          Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-17 12:39 -0700
        Re: guard ring? Jasen Betts <jasen@xnet.co.nz> - 2018-10-17 19:15 +0000
        Re: guard ring? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-17 15:33 -0400
          Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-17 12:56 -0700
            Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-17 13:15 -0700
        Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-17 16:34 -0500

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