CS616 and CS625 Water Content Reflectometers
power
Red
gnd
Black
output
Green
enable
Orange
drain/gnd
Clear
FIGURE 6-2. CS625 Water Content Reflectometer
6.4 Datalogger Instructions and Programming
This section is for users who write their own programs. A
datalogger program can be generated using Short Cut software.
You do not need to read this section if using Short Cut.
NOTE
The output of the CS616 is a square wave with amplitude of
±
0.7 Vdc and a
frequency that is dependent on the dielectric constant of the material
surrounding the probe rods. The CRBasic instruction
CS616()
is used by the
CR800, CR850, CR1000, CR3000, and CR5000 dataloggers to measure the
CS616 output period. Edlog Instruction 138 is specifically designed for the
CR510, CR10X, and CR23X to measure the output period of the CS616. The
period value is used in the calibration for water content. The period in air is
approximately 14.7 microseconds, and the period in saturated soil with porosity
0.4 is approximately 31 microseconds. Edlog Instruction 27, Period Average,
can also be used to measure CS616 output period.
The output of the CS625 is a square wave with amplitude of 0 to 3.3 Vdc and a
frequency that is dependent on the dielectric constant of the material
surrounding the probe rods. The CRBasic instruction
PeriodAvg()
is used by
the CR200(X) series dataloggers to measure the CS625 output period. The
period value is used in the calibration for water content. The period in air is
approximately 14.7 microseconds, and the period in saturated soil with porosity
0.4 is approximately 31 microseconds.
6.4.1 Measuring the CS616 Using CRBasic
The CRBasic instruction
CS616()
is used by the CR800, CR850, CR1000
CR3000, and CR5000 dataloggers to measure the CS616 output period (in
microseconds). The
CS616()
instruction is used to enable and measure a
CS616 Water Content Reflectometer.
CS616(
Dest, Reps, SEChan, Port, MeasPerPort, Mult, Offset
)
6
Summary of Contents for CS616
Page 2: ......
Page 8: ...Table of Contents iv ...
Page 50: ...CS616 and CS625 Water Content Reflectometers 42 ...
Page 52: ...Appendix A Discussion of Soil Water Content A 2 ...
Page 53: ......