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LWS Dielectric Leaf Wetness Sensor
7.2 Wiring
TABLE 7-1. Wire Color, Function, and Datalogger Connection
Color
Function
CR200(X), CR6,
CR800/850, CR5000,
CR3000, CR1000, CR9000(X)
White
Voltage Excitation
Switched Voltage Excitation
Red
Analog Out
Single-Ended Channel
Bare
Analog Ground
⏚
7.3 Programming
Short Cut
is the best source for up-to-date datalogger programming code.
Programming code is needed
•
when creating a program for a new datalogger installation
•
when adding sensors to an existing datalogger program
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
(p. 2)
. If you wish to
import
Short Cut
code into
CRBasic Editor
to create or add to a customized
program, follow the procedure in Appendix Appendix
(p. A-1)
. Programming basics for CRBasic
dataloggers are provided in the following sections. A complete program
example for a CRBasic datalogger can be found in Appendix
(p. B-1)
. Programming basics and programming examples for Edlog
www.campbellsci.com/old-manuals
7.3.1 Voltage Measurement
The LWS requires excitation voltage between 2.5 and 5 Vdc. It produces an
output voltage dependent on the dielectric constant of the medium surrounding
the probe. Output voltage ranges from 10 to 50% of the excitation voltage.
Except for the CR200(X), CRBasic dataloggers use the
BRHalf()
instruction to
measure the probe’s output. The
BRHalf()
instruction and parameters are as
follows:
BRHalf
(Dest,Reps,Range,SeChan,ExChan,MeasPEx,ExmV,RevEx,Settling,Integ,
Mult,Offset)
NOTE
7
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