Re: TDR questions

[Steve Sargent <sargent@isgs.uiuc.edu>]

Hi luke,

	I've used the CS615 sensor and found calibrating is a good idea, at least
for the soil type in my area. Joel Green at Campbells was very helpfull
with this and should be able to answer your questions regarding cable
length. 200m is quite a distance. I designed a few dataloggers specifically
for this probe, to avoid the long cable runs. here in the midwest,
lightning is a concern, even in february!!! If you are interested in the
dataloggers I designed, feel free to contact me and I'll give you
additional details.
 
Steve Sargent
Il. State Geological Survey
Champaign, Il 61820
phone  217-333-5116
fax  217-333-2830
E-mail:  sargent@isgs.uiuc.edu
Alternate:  sargent@shout.net  


>From: owner-sowacs@aqua.ccwr.ac.za
>Date: Tue, 2 Feb 1999 17:58:07 GMT
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>Subject: TDR questions
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>Hi All
>
>Currently I am using a TDR system supplied by Campbell Scientific and
>comprises CS615 sensors and a CR10X logger.   I need to measure the soil
>water contents on different silvicultural treatments. Now these plots are
>really large and I will need to have cables up to 200m in length between the
>logger and sensor. Does the cable length affect the accuracy of the reading
>and what is the maximum cable length that can be used with these sensors?
>Second, I suppose like the neutron probe the best way to calibrate the
>sensors is gravimetrically?  Anyone else using the same equipment?
>
>Any comments or suggestions?
>
>Regards
>
>Luke
>
>
>Luke Esprey
>BSc (Hons), MSc (Hydrology)
>>Soilwater Research Officer                         
>>Institute for Commercial Forestry Research  
>>P.O. Box 100281, Scottsville, 3209, Republic of South Africa
>>                                             
>e-mail   lukes@icfr.unp.ac.za 
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