| 40m Log
||Not logged in
Sun May 10 13:34:32 2009, caryn, Update, PEM, Unplugged Guralp channels
Mon May 18 01:54:35 2009, rana, Update, PEM, Unplugged Guralp channels
Mon May 18 10:06:56 2009, caryn, Update, PEM, Temp sensor
Mon May 18 15:31:11 2009, rana, Update, PEM, Temp sensor
Message ID: 1599
Entry time: Mon May 18 10:06:56 2009
In reply to: 1597
Reply to this: 1600
|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