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Entry  Sun May 10 13:34:32 2009, caryn, Update, PEM, Unplugged Guralp channels 
    Reply  Mon May 18 01:54:35 2009, rana, Update, PEM, Unplugged Guralp channels Untitled.png
       Reply  Mon May 18 10:06:56 2009, caryn, Update, PEM, Temp sensor datadropout.pngcoolerpic1.jpgcoolerpic2.jpg
          Reply  Mon May 18 15:31:11 2009, rana, Update, PEM, Temp sensor Untitled.png
Message ID: 1599     Entry time: Mon May 18 10:06:56 2009     In reply to: 1597     Reply to this: 1600
Author: caryn 
Type: Update 
Category: PEM 
Subject: Temp sensor 

To see if Caryn's data dropouts were happening, I looked at a trend of all of our temperature channels. Looks OK now.

Although you can't see it because I zoomed in, there's a ~24 hour relaxation happening before Caryn's sensors equilibrate.
I guess that's the insulating action of the cooler? We need a picture of the cooler in the elog for posterity.[/quote

Dropouts can't been seen with a minute trend, only a second trend. No big deal, but they are still occurring. See plot below.

The 24hr relaxation period is due to the cooler and some metal blocks that were cooled in the freezer and then put in the cooler to see if the relationship between the temp sensors changed with temperature. The relationship is not linear, which probably means there is some non-linearity in each temperature sensor's relationship to temperature. So, when calibrating them with Bob's temp sensor, more than 2 data points need to be collected.

Picture of cooler for posterity is attached
Attachment 1: datadropout.png  10 kB  | Show | Hide all | Show all
Attachment 2: coolerpic1.jpg  72 kB  | Hide | Hide all | Show all
Attachment 3: coolerpic2.jpg  66 kB  | Hide | Hide all | Show all
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