Campbell Scientific AM16/32A Multiplexer - Manual (Page 4)

AM16/32A Relay Multiplexer Table of Contents
6.6 Thermocouple Measurement.................................................................. 28
6.6.1 Measurement Considerations ....................................................... 28
6.6.2 Single-ended Thermocouple Measurement .................................. 30
6.6.3 Differential Thermocouple Measurement .................................... 31
6.7 Mixed Sensor Types............................................................................... 31
6.7.1 Mixed Sensor Example: Soil Moisture Blocks and
Thermocouples............................................................................... 31
7. General Measurement Considerations
....................35
8. Installation
..................................................................35
8.1 Mounting Tabs ....................................................................................... 36
8.2 Controlling Humidity............................................................................. 36
Appendices
A. AM16/32A Improvements
........................................ A-1
Figures
1. AM16/32A Relay Multiplexer ................................................................... 3
2. AM16/32A Relay Actuation Time vs. Temperature and Battery Voltage .. 5
3. AM16/32A to Datalogger Power/Control Hookup .................................... 6
4. Power and Ground Connections for External Power Supply ..................... 8
5. Typical AM16/32A to Datalogger Signal Hookup (4x16 Mode)............... 9
6. SCWIN (Short Cut for Windows Program Builder) ................................ 10
7. Example “4x16” Mode Program Loops for CR23X, CR10(X),
21X, and CR7 Dataloggers ............................................................ 14
8. Example “2x32” Mode Program Loops for CR23X, CR10(X),
21X, and CR7 Dataloggers ............................................................ 15
9. Wiring Diagram for Strain Gages and Potentiometers............................. 16
10. Single-ended Measurement without Excitation...................................... 23
11. Differential Measurement without Excitation........................................ 23
12. Half Bridge (Modified 107 Temperature Probe) Hook-up and
Measurement.................................................................................. 24
13. Potentiometer Hook-up and Measurement............................................. 25
14. Four Wire Half Bridge Hook-up and Measurement............................... 26
15. Full Bridge Measurement....................................................................... 26
16. Full Bridge Measurement with Excitation Compensation ..................... 27
17. Differential Thermocouple Measurement with Reference
Junction at the Datalogger ............................................................. 29
18. Differential Thermocouple Measurement with Reference
Junction at the AM16/32A............................................................. 29
19. AM16/32A Aluminum Cover Plate ....................................................... 30
20. Thermocouple and Soil Block Measurement ......................................... 32
21. Mounting Tab Hole Pattern.................................................................... 36
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