Last week you may recall that I posted about my new self contained MMTS unit that I’m experimenting with as a possible replacement of as a check system for NOAA’s existing MMTS. Below you can see my test setup in my back yard.
This is a custom wireless MMTS with internal data logger that I built, view from my backyard.
The most valuable thing about my version of MMTS is that it is cable free, can be placed anywhere, and can log data automatically for days, weeks of even months, depending on the interval. It also logs relative humidity, and dewpoint.
Here is what the internal sensor package/datalogger unit looks like when not installed in the infrared radiation shield:
When you are ready to download the data for analysis, all you have to do is unscrew the head, connect the USB cable to the datalogger and to your laptop as I did shown below. This easy ability to plug into a laptop to download data and start a new data logging run in under 5 minutes makes the design very suitable for field work away from networking and AC power.
Data transfer for the one week of data I recorded only took about two seconds.
I have plotted all three measurements from the sensor below:
And here is the raw data file, with data logged every minute, in comma delimited format if you wish to plot it, a key to the values is on line1 of the file. jan20-2008.txt
For comparison, I have logs online from the Davis Vantage Pro2 weather station shown in the background
Jan 13th http://www.bidwellranchcam.com/data/011308hd.txt
Jan 14th http://www.bidwellranchcam.com/data/011408hd.txt
Jan 15th http://www.bidwellranchcam.com/data/011508hd.txt
Jan 16th http://www.bidwellranchcam.com/data/011608hd.txt
Jan 17th http://www.bidwellranchcam.com/data/011708hd.txt
Jan 18th http://www.bidwellranchcam.com/data/011808hd.txt
Jan 19th http://www.bidwellranchcam.com/data/011908hd.txt
Jan 20th http://www.bidwellranchcam.com/data/012008hd.txt
I also prepared a comparison file showing how the New MMTS and the nearby Davis Weather Station max/min readings compare. There is good agreement, with some slight differences that could be related to observation height differences between the two sensor sets.
See the comparison file: newmmts_hi-lo_compare.txt