Campbell Scientific CR510 Basic Datalogger - Manual (Page 7)

CR510 TABLE OF CONTENTS
iii
7.8 100 ohm PRT in 4 Wire Full Bridge ........................................................................................7-7
7.9 Pressure Transducer - 4 Wire Full Bridge ..............................................................................7-8
7.10 Lysimeter - 6 Wire Full Bridge.................................................................................................7-9
7.11 227 Gypsum Soil Moisture Block ..........................................................................................7-11
7.12 Nonlinear Thermistor in Half Bridge ......................................................................................7-12
7.13 Water Level - Geokon's Vibrating Wire Pressure Sensor.....................................................7-13
7.14 4 to 20 mA Sensor Using CURS100 Terminal Input Module ................................................7-17
8. PROCESSING AND PROGRAM CONTROL EXAMPLES
8.1 Computation of Running Average ...........................................................................................8-1
8.2 Rainfall Intensity ......................................................................................................................8-2
8.3 Sub 1 Minute Output Interval Synched to Real Time ..............................................................8-3
8.4 Switch Closures on Control Port (Rain Gage).........................................................................8-3
8.5 Converting 0-360 Wind Direction Output to 0-540 for Strip Chart...........................................8-4
8.6 Use of 2 Final Storage Areas - Saving Data Prior to Event ....................................................8-5
8.7 Logarithmic Sampling Using Loops.........................................................................................8-6
INSTRUCTIONS
9. INPUT/OUTPUT INSTRUCTIONS .....................................................................................9-1
10. PROCESSING INSTRUCTIONS ......................................................................................10-1
11. OUTPUT PROCESSING INSTRUCTIONS ...................................................................11-1
12. PROGRAM CONTROL INSTRUCTIONS ......................................................................12-1
MEASUREMENTS
13. CR510 MEASUREMENTS
13.1 Fast and Slow Measurement Sequence ...............................................................................13-1
13.2 Single-Ended and Differential Voltage Measurements .........................................................13-2
13.3 The Effect of Sensor Lead Length on the Signal Settling Time ............................................13-3
13.4 Bridge Resistance Measurements ......................................................................................13-12
13.5 Resistance Measurements Requiring AC Excitation ..........................................................13-16
13.6 Calibration Process .............................................................................................................13-17
INSTALLATION
14. INSTALLATION AND MAINTENANCE
14.1 Protection from the Environment ..........................................................................................14-1
14.2 Power Requirements.............................................................................................................14-1
14.3 Campbell Scientific Power Supplies......................................................................................14-2
14.4 Solar Panels ..........................................................................................................................14-5
14.5 Direct Battery Connection to the CR510 Terminal Strip........................................................14-5
14.6 Vehicle Power Supply Connections ......................................................................................14-5
14.7 Grounding .............................................................................................................................14-6
14.8 Terminal Strip........................................................................................................................14-7
14.9 Use of Digital I/O Ports for Switching Relays ........................................................................14-7
14.10 Maintenance..........................................................................................................................14-9