Campbell Scientific AM416 Multiplexer - Manual (Page 3)

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AM416 RELAY MULTIPLEXER MANUAL
TABLE OF CONTENTS
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1. FUNCTION
1.1 Typical Applications....................................................................................................................1
1.2 Compatibility...............................................................................................................................1
2. PHYSICAL DESCRIPTION .....................................................................................................1
3. AM416 SPECIFICATIONS ......................................................................................................3
4. OPERATION ................................................................................................................................3
4.1 The Control Terminals ...............................................................................................................3
4.2 The Measurement Terminals .....................................................................................................6
5. DATALOGGER PROGRAMMING
5.1 Single Loop Instruction Sequence .............................................................................................6
5.2 Multiple Loop Instruction Sequence ...........................................................................................9
5.3 General Programming Considerations.....................................................................................10
6. SENSOR HOOK-UP AND MEASUREMENT EXAMPLES
6.1 Single-Ended Analog Measurement without Sensor Excitation ...............................................10
6.2 Differential Analog Measurement without Sensor Excitation ...................................................11
6.3 Half Bridge Measurements.......................................................................................................11
6.4 Full Bridge Measurements .......................................................................................................13
6.5 Full Bridges with Excitation Compensation ..............................................................................13
6.6 Thermocouple Measurement ...................................................................................................14
6.7 Mixed Sensor Types ................................................................................................................16
7. GENERAL MEASUREMENT CONSIDERATIONS .......................................................18
8. INSTALLATION
8.1 Environmental Constraints ................................................................................................................18
APPENDIX A. AM416 STUFFING CHART AND SCHEMATICS .................................... A-1
APPENDIX B. DIFFERENCES BETWEEN THE AM416 AND AM32 ............................ B-2
LIST OF FIGURES
1. Plan View of the AM416 Relay Multiplexer ................................................................................2
2. Hook-up Diagrams for Datalogger - AM416 Connections..........................................................4
3. Power and Ground Connections for External Power Supply......................................................5
4. Actuation Time of Relays vs. Temperature ( o ) and Battery Voltage ..........................................6
5. Single Loop Instruction Sequence .............................................................................................6
6. Example Program Loops for CR10(X), 21X, and CR7 Dataloggers ..........................................8