Ryan-
The process verification plates are just board or component geometry artwork
on high strength glass.  You coat them with tacky adhesive so that the parts
you place on it do not move while you measure the placement offset.

The glass is dimensionally stable and the artwork on it is super-accurate.
It is just the thing for testing the absolute accuracy of your surface mount
component placement system, without picking up variances due to the circuit
board itself.  And, because the glass is clear, you can measure the
placement offsets of BGAs from the back side (tip: replace the round BGA pad
with a donut or a cross).  (Second tip:  beware of microscope parallax when
making leaded part measurements).

 Larry Jindra
 TRW/Avionics Systems Division
 [log in to unmask]
 ph (619) 592-3424
 fax(619) 592-3940



> -----Original Message-----
> From: Ryan Jennens [mailto:[log in to unmask]]
> Sent: Wednesday, December 09, 1998 1:06 PM
> To: [log in to unmask]
> Subject: Re: [TN] Process Verification and Calibration Tools
>
>
> Howdy all-
>
>         How do these process verification plates work?  I
> have never heard of them.
> I appreciate any insight.
>
> Ryan Jennens
> Phoenix Engineering Design, Inc.
>
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]]On Behalf Of Jindra, Larry
> > Sent: Wednesday, December 09, 1998 2:29 PM
> > To: [log in to unmask]
> > Subject: Re: [TN] Process Verification and Calibration Tools
> >
> >
> > William-
> > I use Infinite Graphics in Minneapolis, MN  ph 612 721-6283
> for process
> > verification plates.  I typically request black artwork on .090
> > thick glass
> > to an 1/8 mil tolerance, although you can go tighter.  They'll
> > turn in less
> > than a week, and I have always been satisfied.
> >
> >  Larry Jindra
> >  TRW/Avionics Systems Division
> >  [log in to unmask]
> >  ph (619) 592-3424
> >  fax(619) 592-3940
> >
> >
> >
> > > -----Original Message-----
> > > From: William Keeton [mailto:[log in to unmask]]
> > > Sent: Wednesday, December 09, 1998 8:02 AM
> > > To: [log in to unmask]
> > > Subject: [TN] Process Verification and Calibration Tools
> > >
> > >
> > > I am interested in obtaining information on glass calibration
> > > substrate
> > > manufacturing and SMT Process Verification and Calibration tools.
> > > I have a current design which I need artwork attached to a
> > > substrate. I have
> > > not identified the material as yet due in part for a need to
> > > have a glass or
> > > very flat surface with an image impregnated or attached to
> > > its surface. Can
> > > anyone give guidance to procure a process which can place an
> > > image on a 19X14
> > > area with shrink and stretch reduced to obtain a .005
> > > millimeter tolerance on
> > > center?
> > >
> > > Thank you,
> > >
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