Jacob,
The correct term that fits the definition of
>behavior of the metal during variation of heating temperatures.
is CTE or coefficient of thermal expansion.
Thanks
Ryan Grant
Advanced Technology Engineer
MCMS
(208) 898-1145
[log in to unmask]
> -----Original Message-----
> From: <Jacob Pao King Hing> [SMTP:[log in to unmask]]
> Sent: Wednesday, October 11, 2000 5:52 AM
> To: [log in to unmask]
> Subject: Re: [TN] Thermohidrograph
> Importance: High
>
> Brian,
>
> Thanks for the fast response.
>
> But the definition that I get from the person who asked me is as per
> below:
>
> Definition: Thermohydrograph is basically the its characteristics and
> behavior of the metal traces within the board during exposure to variation
> of heating temperatures.
>
> Is his definition correct?? Or is he's trying to express his understanding
> as per above but used the wrong term?
>
> Regards,
>
> Jacob Pao
>
>
>
> -----Original Message-----
> From: Brian Ellis [ <mailto:[log in to unmask]>]
> Sent: Wednesday, October 11, 2000 5:33 PM
> To: TechNet E-Mail Forum.; Pao, JacobKH
> Subject: Re: [TN] Thermohidrograph
>
>
> A thermohygrograph, which is what I assume you are meaning, is an
> instrument to record the temperature and relative humidity. It usually
> consists of a drum, rotating over 24 hours, on which is clipped a paper
> chart, with two pens drawing squiggly lines, one attached to a bimetal
> spiral for the temperature and the other to a hair hygrometer movement
> for the humidity. Very useful for putting into rooms where you are
> stencilling solder paste, etc. to check that the environment is
> correctly controlled.
>
> Brian
>
> > "" wrote:
> >
> > Technetter,
> >
> > May I know what does the term "thermohidrograph" mean? Is it a test
> > measurement for PCB?
> >
> > Regards,
> >
> > Jacob Pao
>
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