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Is compensation for pressure variations needed?

April 26, 2017compensation needed pressure variations

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Is compensation for pressure variations needed?

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The air pressure that is required should be an average value for the site the instrument is operated. It does not need to be updated over time. The meaning of it is to correct for (a small) optical shift due to atmospheric pressure. A normal value depends of course on the heath of operation. A value of 1000 mBar is typical for sea level.