Campbell LWS, Руководство по эксплуатации продукта

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LWS Dielectric Leaf Wetness Sensor
6
7.2 Wiring
TABLE 7-1. Wire Color, Wire Function, and Data Logger Connection
Wire
Color Wire Function Data Logger Connection Terminal
Brown or
White
Voltage
excitation input
U configured for voltage excitation 1 , EX,
VX (voltage excitation)
Orange or
Red
Analog voltage
output
U configured for single-ended analog
input 1 , SE (single-ended, analog input)
Clear Shield
⏚ (analog ground)
1
U terminals are automatically configured by the measurement instruction.
7.3 Programming
Short Cut
is the best source for up-to-date data logger programming code.
If your data acquisition requirements are simple, you can probably create and
maintain a data logger 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 Appendix A , Importing Short Cut
Code Into CRBasic Editor
(p. A-1)
. Programming basics for CRBasic data
loggers are provided in the following sections. Complete program examples for
CRBasic data loggers can be found in Appendix B , Example Programs
(p. B-1)
.
Programming basics and programming examples for Edlog data loggers are
provided at
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 sensor. Output voltage ranges from 10 to 50% of the excitation voltage.
Except for the CR200(X), CRBasic data loggers use the BRHalf() instruction
to measure the sensor output. The BRHalf() instruction and parameters are as
follows:
BRHalf (Dest,Reps,Range,SeChan,ExChan,MeasPEx,ExmV,RevEx,Settling,
fN1/Integ,Mult,Offset)
The CR200(X) uses the ExDelSE() CRBasic instruction to measure the sensor
output. The ExDelSE() instruction and parameters are as follows:
ExDelSE ( Dest, Reps, SEChan, ExChan, ExmV, Delay, Mult, Offset )
NOTE