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RickSFO
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Joined: 30 Dec 2012
Posts: 8
Location: San Francisco
Expertise: Professional

Posted Sat Apr 20, 2013, 11:19am
Subject: Re: coffee refractometer
 

On the VST LAB refractometer, does anyone know what the "temperature stability function" is?  It appears to be different from the temperature correction since it's listed as a separate feature.  Perhaps it's an "on the fly" temperature correction?
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andys
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andys
Joined: 10 May 2003
Posts: 857
Location: NY
Expertise: Just starting

Espresso: Speedster, Londinium 1
Grinder: EK-43,Robur, HG One, M3
Vac Pot: Yama
Drip: various
Roaster: PIDed Popper
Posted Sun Apr 21, 2013, 6:33pm
Subject: Re: coffee refractometer
 

RickSFO Said:

On the VST LAB refractometer, does anyone know what the "temperature stability function" is?

Posted April 20, 2013 link

According to VST:

When you take a reading with the VST LAB refractometer, the instrument actually takes 30 separate measurements in a brief period of time. If the prism temperature varies more than 0.1C during this process, a "temperature stability error" is returned. You have to wait until things thermally stabilize.

This is distinct from "temperature compensation." That means you can make your measurements at any temperature between 15C and 30C. The result will be accurate as long as you (a) zero the instrument and (b) make your measurement at the same temperature.

 
-AndyS
picture page:  http://flickr.com/photos/andy_s/sets/
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