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INSTRUCTION MANUALAM416 Relay MultiplexerRevision: 2/96Copyright (c) 1987-1996Campbell Scientific, Inc.

AM416 RELAY MULTIPLEXER4FIGURE 2. Hook-up Diagrams for Datalogger - AM416 ConnectionsCR10(X) Hook-up 21X Hook-upCR7 Hook-upThe 21X or CR7 (with a 7

AM416 RELAY MULTIPLEXER5voltage level must fall below 1.5VDC thenexceed 3.5VDC to clock. Pulse width must beat least 5 ms. An additional delay is re

AM416 RELAY MULTIPLEXER6FIGURE 4. Actuation Time of Relays vs.Temperature (oC) and Battery Voltage.4.2 THE MEASUREMENT TERMINALSThe terminals that r

AM416 RELAY MULTIPLEXER7(3) Clock/Delay - With the CR10(X), the clockline is connected to a control port. Instruction86 with the pulse port command (

AM416 RELAY MULTIPLEXER8EXAMPLE PROGRAMS - GENERALIZED PROGRAM LOOPS FOR THE CR10(X), 21X AND CR7.21X SAMPLE PROGRAM* 1 Table 1Programs01: 60 Sec.Exec

AM416 RELAY MULTIPLEXER9FIGURE 7. Wiring Diagram for Strain Gages and Potentiometers(8) Additional Loops - Additional loops may beused if sensors tha

AM416 RELAY MULTIPLEXER10BEGINNING OF POTENTIOMETERMEASUREMENT LOOP06: P87 Beginning of Loop01: 0 Delay02: 6 Loop Count07: P90 Step Loop Index (Extend

AM416 RELAY MULTIPLEXER11FIGURE 8. Single-ended Measurement Without ExcitationFIGURE 9. Differential Measurement Without Excitation6.2 DIFFERENTIAL

AM416 RELAY MULTIPLEXER12FIGURE 10. Half Bridge (Modified 107 Temperature Probe) Hook-up and Measurement.FIGURE 11. Potentiometer Hook-up and Measur

AM416 RELAY MULTIPLEXER13FIGURE 12. Four Wire Half Bridge Hook-up and MeasurementFIGURE 13. Differential Measurement with Sensor Excitation6.4 FULL

Warranty and AssistanceThe AM416 RELAY MULTIPLEXER is warranted by CAMPBELLSCIENTIFIC, INC. to be free from defects in materials and workmanship under

AM416 RELAY MULTIPLEXER14FIGURE 14. Full Bridge Measurement with Excitation Compensation6.6 THERMOCOUPLE MEASUREMENTThe datalogger manuals contain t

AM416 RELAY MULTIPLEXER15FIGURE 15. Differential Thermocouple Measurement with Reference Junction at the Datalogger.FIGURE 16. Differential Thermoco

AM416 RELAY MULTIPLEXER166.6.2 SINGLE-ENDED THERMOCOUPLEMEASUREMENTIn single-ended thermocouple measurement,the following precautions must be taken t

AM416 RELAY MULTIPLEXER17EXAMPLE PROGRAM - THERMOCOUPLEAND SOIL BLOCK MEASUREMENT(PROGRAM IS FOR CR10(X) - 33LOCATIONS ALLOCATED TO INPUTSTORAGE)* 1 T

AM416 RELAY MULTIPLEXER187. GENERAL MEASUREMENTCONSIDERATIONS1. Long lead lengths - long lead lengthscontribute to the formation of induced andcapac

A-1APPENDIX A. AM416 STUFFING CHART AND SCHEMATICS

APPENDIX A. AM416 STUFFING CHART AND SCHEMATICSA-2

APPENDIX A. AM416 STUFFING CHART AND SCHEMATICSA-3

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B-1APPENDIX B. DIFFERENCES BETWEEN THE AM416 AND THE AM32The AM416 differs from Campbell Scientific'sAM32 multiplexer in the following ways:1.

iAM416 RELAY MULTIPLEXER MANUALTABLE OF CONTENTSPDF viewers note: These page numbers refer to the printed version of this document. Usethe Adobe Acr

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Campbell Scientific CompaniesCampbell Scientific, Inc. (CSI)815 West 1800 NorthLogan, Utah 84321UNITED [email protected]

ii7. Wiring Diagram for Strain Gages and Potentiometers...98. Single-ended Measurement wit

CAUTIONARY NOTESThe AM416 is not designed to multiplex power. Its intended function is to switch low level analogsignals. Switched current in excess

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1AM416 RELAY MULTIPLEXER1. FUNCTIONThe primary function of the AM416 Multiplexeris to increase the number of sensors that maybe scanned by Campbell&a

AM416 RELAY MULTIPLEXER2Wires from sensors and datalogger areconnected to the gray terminal strips. The setof four terminals located near the strain-

AM416 RELAY MULTIPLEXER33. AM416 SPECIFICATIONSPOWER*: unregulated 12 VDC (9.6 V to 16 V)- See Figure 4 for implications of low power torelay actuat