Campbell 237, Руководство по эксплуатации продукта

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237 Leaf Wetness Sensor
6
7.4 Datalogger Programming
Short Cut is the best source for up-to-date datalogger programming code.
If your data acquisition requirements are simple, you can probably create and
maintain a datalogger program exclusively with Short Cut . If your data
acquisition needs are more complex, the files that
Short Cut
creates are a great
source for programming code to start a new program or add to an existing
custom program.
Short Cut cannot edit programs after they are imported and edited
in CRBasic Editor .
A Short Cut tutorial is available in Section 4 , QuickStart
(p. 1)
. If you wish to
import Short Cut code into CRBasic Editor to create or add to a customized
program, follow the procedure in Appendix A ,
Importing Short Cut Code Into
CRBasic Editor
(p. A-1)
. Programming basics for CRBasic dataloggers are in the
following section. Complete program examples for select CRBasic dataloggers
can be found in Appendix B , Example Programs
(p. B-1)
. Programming basics
and programming examples for Edlog dataloggers are provided at
www.campbellsci.com\old-manuals .
The datalogger program measures Vs/Vx and then uses this measurement to
calculate resistance. Information about calculating the wet/time fraction is
provided in Section 8 ,
Operation
(p. 7)
. Refer to Appendix B ,
Example
Programs
(p. B-1)
, for suggested implementation of measurement and processing
concepts.
7.4.1 Measurement of Vs / Vx
The base measurement of the 237 sensor is Vs/Vx, where Vs is the voltage
measured and Vx is the excitation voltage supplied by the datalogger. Vs/Vx is
measured by the datalogger with the instructions and parameters listed in
TABLE 7-2 .
NOTE