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October 2000

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Subject:
From:
Timothy Reeves <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 11 Oct 2000 11:50:37 -0700
Content-Type:
text/plain
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text/plain (44 lines)
It can also be done with an electronic datalogging instrument, the data from
which can be downloaded to a PC for graphing/analysis. A human hair
hygrometer is generally more accurate than an electronic humidity sensor,
but the electronic version is less expensive, more easily moved around, and
lets you save the data to a file.
Tim Reeves

|-----Original Message-----
|From: Brian Ellis [mailto:[log in to unmask]]
|Sent: Wednesday, October 11, 2000 2:33 AM
|Subject: Re: 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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