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

---------------------------------------------------------------------------------
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF TECHNET
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------