User Manual

Table of Contents

PDF viewers: These page numbers refer to the printed version of this document. Use the

PDF reader bookmarks tab for links to specific sections.

1. Introduction.................................................................1

2. Cautionary Statements...............................................1

3. Initial Inspection .........................................................1

4. Quickstart ....................................................................2

4.1 Installation............................................................................................2

4.2 Use SCWin to Program Datalogger and Generate Wiring Diagram ....2

5. Overview......................................................................6

6. Specifications .............................................................7

7. Operation.....................................................................8

7.1 Wiring ..................................................................................................8

7.2 Programming........................................................................................9

7.2.1 Control the Multiplexer.................................................................9

7.2.1.1 CRBasic..............................................................................9

7.2.1.2 Edlog ................................................................................10

7.2.2 Excite and Measure the 223........................................................10

7.2.3 Calculate Sensor Resistance........................................................11

7.2.4 Calculate Soil Water Potential ....................................................11

7.2.5 Example Programs ......................................................................14

7.2.5.1 Example CR1000 Program...............................................14

7.2.5.2 Example CR10(X) Program .............................................16

7.2.5.3 Example 21X Program.....................................................18

Figures

7-1. 223 wiring ............................................................................................8

7-2. Polynomial fit to typical block resistance vs. water potential ............13

7-3. Wiring for CR1000 example..............................................................14

7-4. Wiring for CR10(X) example ............................................................16

7-5. Wiring for example 21X program......................................................18

Tables

7-1. 223 Wiring ...........................................................................................8

7-2. Excitation and Voltage Ranges ..........................................................10

7-3. Typical Soil Water Potential, R

and V

/ V

......................................12