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From: Roger Johansson
Subject: Re: Humidity sensor - peculiar behavior
Date: Mon, 06 Jan 2003 12:07:42 +0100
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Steve Turner wrote:
>I believe I have eliminated the possibility of a faulty sensor. I
>have removed the sensor from the circuit board and suspended it naked
>in the 75% constant humidity chamber. The reading is spot on with
>only negligible drift.
>Oddly, though, I cannot reproduce the drift problem by plugging the
>end of the sensor cable into same circuit as exists on the printed
>circuit board. This configuration also gives a stable reading! The
>only difference here is that the circuit is on a solderless breadboard
>outside of the chamber instead of on a printed circuit board inside
I am not sure I understand all of this, but couldn't you use that
method for measurements in the future, to put just the sensor into the
measured environment and keep the circuit outside of it?
Or explore the possibility that there might be something wrong with
the circuit on the circuit board which is not wrong in the seemingly
identical circuit you have built on the solderless breadboard.
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