Maybe with a climatic chamber and a psichometer will be easyest...

About small capacitance measurement, domestic scales are using an 8...10
pF variation for a 0 to 1000g measurement. Without any external circuit !
The sensor is tied directly to microcontroller from gnd ( what I wish to
find what chip is ! ) and a 300k resistor to VCC.

best, Vasile


On Tue, 2 Apr 2002, Sean H. Breheny wrote:

> Hi Spehro,
>
> Why do you have to prepare a range of solutions of different salts in ord=
er
> to calibrate a Humidity sensor?!
>
> Sean
>
> At 09:26 PM 4/2/02 -0500, you wrote:
> More of a problem with the Philips part is calibration.. you have to
> >procure saturated salt solutions like these:
> >
> >RH @25=B0C
> >Lithium chloride                LiCl            11.3%
> >Potassium acetate               KC2H3O2         22.5%
> >Magnesium chloride              MgCl2           32.8%
> >Potassium carbonate             K2CO3           43.2%
> >Magnesium nitrate               Mg(NO3)2        52.9%
> >Sodium chloride                 NaCl            75.3%
> >Potassium chloride              KCl             84.3%
> >Potassium nitrate               KNO3            93.6%
> >Potassium sulphate              K2SO4           97.3%
> >
> >Best regards,
> >
> >Spehro Pefhany --"it's the network..."            "The Journey is the re=
ward"
> >speff@interlog.com             Info for manufacturers: http://www.trexon=
=2Ecom
> >Embedded software/hardware/analog  Info for designers:  http://www.speff=
=2Ecom
> >9/11 United we Stand
> >
> >--
> >http://www.piclist.com hint: PICList Posts must start with ONE topic:
> >[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
> >
>
> --
> http://www.piclist.com hint: PICList Posts must start with ONE topic:
> [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
>
>

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics