Campbell Scientific CR7 Measurement and Control System - Manual (Page 7)

TABLE OF CONTENTS
iii
PROGRAMMING EXAMPLES
7. MEASUREMENT PROGRAMMING EXAMPLES
7.1 Single Ended Voltage-LI200S Silicon Pyranometer ................................................................7-1
7.2 Differential Voltage Measurement...........................................................................................7-1
7.3 Thermocouple Temperatures Using 723-T Reference ...........................................................7-2
7.4 Thermocouple Temperatures Using an External Reference Junction ....................................7-2
7.5 Thermocouples for Differential Temperature Measurement ...................................................7-3
7.6 Temperature with Calibrated Thermocouples.........................................................................7-4
7.7 107 Temperature Probe ..........................................................................................................7-5
7.8 207 Temperature and RH Probe.............................................................................................7-5
7.9 Anemometer with Photochopper Output .................................................................................7-6
7.10 Tipping Bucket Raingage with Long Leads.............................................................................7-6
7.11 100 ohm PRT in 4 Wire Half-Bridge........................................................................................7-7
7.12 100 ohm PRT in 3 Wire Half-Bridge........................................................................................7-8
7.13 100 ohm PRT in 4 Wire Full-Bridge ........................................................................................7-9
7.14 Pressure Transducer-4 Wire Full-Bridge ..............................................................................7-10
7.15 Lysimeter-6 Wire Load Cell...................................................................................................7-11
7.16 227 Gypsum Soil Moisture Block ..........................................................................................7-13
7.17 Nonlinear Thermistor in Half Bridge (CSI Model 101)...........................................................7-14
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 Analog Output to Strip Chart ...................................................................................................8-4
8.5 Converting 0-360 Wind Direction Output to 0-540 for Strip Chart...........................................8-5
8.6 Covariance Correlation Programming Example......................................................................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. CR7 MEASUREMENTS
13.1 Fast and Slow Measurement Sequence ...............................................................................13-1
13.2 Single-Ended and Differential Voltage Measurements .........................................................13-1
13.3 The Effect of Sensor Lead Length on the Signal Settling Time ............................................13-3
13.4 Thermocouple Measurements ............................................................................................13-11
13.5 Bridge Resistance Measurements ......................................................................................13-15
13.6 Resistance Measurements Requiring AC Excitation ..........................................................13-19
13.7 Pulse Count Measurements................................................................................................13-20