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Campbell AM16/32B Instruction Manual

Relay multiplexer
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AM16/32B Relay Multiplexer
Revision: 7/16
C o p y r i g h t
©
1 9 8 7 - 2 0 1 6
C a m p b e l l
S c i e n t i f i c ,
I n c .

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Summary of Contents for Campbell AM16/32B

  • Page 1 AM16/32B Relay Multiplexer Revision: 7/16 C o p y r i g h t © 1 9 8 7 - 2 0 1 6 C a m p b e l l S c i e n t i f i c ,...
  • Page 3 Quotations for repairs can be given on request. It is the policy of Campbell Scientific to protect the health of its employees and provide a safe working environment, in support of this policy a “Declaration of Hazardous Material and Decontamination”...

  • Page 5: About This Manual

    PLEASE READ FIRST About this manual Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the North American market. Some spellings, weights and measures may reflect this origin. Some useful conversion factors: Area: 1 in...
  • Page 7 • Periodically (at least yearly) check electrical ground connections. WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS...

  • Page 9: Table Of Contents

    Compatibility ..................1 2. Precautions ..............2 3. Initial Inspection ............2 4. QuickStart ..............2 5. Overview ..............5 6. AM16/32B Specifications ........... 6 7. Installation ..............8 Wiring to Datalogger ................8 7.1.1 Control Terminals ................. 8 7.1.2 COM Terminals ................
  • Page 10 C-1. Differential thermocouple measurement with reference junction at the datalogger ................C-2 C-2. Differential thermocouple measurement with reference junction at the AM16/32B (using 107-L thermistor) ......... C-2 C-3. AM16/32B aluminum cover plate ........... C-3 Tables 7-1. Control Terminal Function and Datalogger Connection ..... 8 B-1.

  • Page 11: Introduction

    The user program advances the multiplexer through the sensor channels, making measurements and storing data. A slide switch located on the AM16/32B’s top panel selects one of two modes of operation. In 2x32 mode, the multiplexer adds 32 terminal pairs. In 4x16 mode, it adds 16 terminal groups with four terminals each.

  • Page 12: Precautions

    CDM-A108 and the AM16/32B. Precautions The AM16/32B is not designed to multiplex power. Its intended function is to switch low-level analog signals. Switched currents in excess of 30 mA will degrade the relay contacts involved, rendering that channel unsuitable for further low-level analog measurement.
  • Page 13 AC voltage. Select 50 Hz Noise Rejection for most of Europe and areas that operate at 50 Hz. A second prompt lists sensor support options. Campbell Scientific, Inc. (US) is probably the best fit if you are outside Europe. To change the first notch frequency or sensor support option for future programs, use the Program menu.
  • Page 14 107 Temperature Probe (4-wire). In the resulting window, enter the number of 107 temperature probes to measure on this AM16/32B multiplexer. For this tutorial, enter 6 as the number of 107 (4-wire) sensors to add. Click OK in the...

  • Page 15: Overview

    COM ODD and EVEN terminals on the other side of the mode switch carry multiplexed signals destined for datalogger terminals. The remaining terminals on the AM16/32B are for sensor and sensor-shield connection. All of the inputs of the AM16/32B are protected...

  • Page 16: Am16/32B Specifications

    11 mA typical in 4x16 mode Reset A continuous signal between 3.3 Vdc and 8 Vdc holds the AM16/32B in an active state (where a clock pulse can trigger a channel advance). A signal voltage < 0.9 Vdc deactivates the AM16/32B (clock pulse will not trigger a channel advance;...
  • Page 17 For power specifications on serial numbers less than 5056, refer to an older version of this manual at www.campbellsci.com/old-manuals. Assumes sequential activation of multiplexers and that each datalogger channel is uniquely dedicated. If the application requires additional multiplexing capability, please consult Campbell Scientific for application assistance.

  • Page 18: Installation

    Reset C, U terminal configured for control Connect the cable shield to G on the AM16/32B and to G on the CR6 series, CR800 series, CR1000, or CR3000. Connect to ⏚ on the CR5000. 7.1.2 COM Terminals The four terminals dedicated to multiplexer-datalogger connection are located under the blue COM label next to the mode switch.

  • Page 19: Measurement Terminals

    (p. B-1) Grounding The AM16/32B has a ground lug that should be connected to earth ground via an 8 AWG wire. This connection should be as short as possible. The ground lug provides a path to dissipate surges that might propagate on a sensor’s shield line.

  • Page 20: Installation In Enclosure

    Operation The reset (RES) line is used to switch on the AM16/32B by applying 3.3 to 8 Vdc. When this line drops lower than 0.9 Vdc, the multiplexer enters a quiescent, low current-drain state. In the quiescent state, the common (COM) terminals are electrically disconnected from all of the sensor input channels.

  • Page 21: Programming

    1H, 1L and ending with 32H, 32L. In 2x32 mode when the AM16/32B selects a given channel, the H terminal is relay-connected to both COM H terminals, and the L sensor terminal is connected to both COM L terminals.

  • Page 22: General Programming Considerations

    When programming for mixed sensors on a single AM16/32B, it is especially important to verify that each measurement is reasonable. Consult Campbell Scientific for application assistance when it is necessary to multiplex markedly different sensor types in an application.

  • Page 23: General Measurement Considerations

    Operation section of the datalogger manual for more information. 8.2.2 Earth Ground The AM16/32B’s ground lug should be connected to earth ground via an 8 AWG wire. This connection should be as short as possible. The AM16/32B also connects to earth ground via the datalogger. The lead wire that connects the datalogger power ground to the AM16/32B power ground (G) establishes this connection.
  • Page 24 AM16/32B Relay Multiplexer...

  • Page 25: Importing Short Cut Code Into Crbasic Editor

    Appendix A. Importing Short Cut Code Into CRBasic Editor This tutorial shows: How to import a Short Cut program into a program editor for • additional refinement • How to import a wiring diagram from Short Cut into the comments of a custom program Short Cut creates files, which can be imported into CRBasic Editor.

  • Page 27: Example Measurements And Programs

    Appendix B. Example Measurements and Programs This section covers sensor-to-AM16/32B connections and AM16/32B-to- datalogger connections. Most programs were created in Short Cut. The following are examples only and should not be construed as the only way to make a particular measurement. See the measurement section of the datalogger manual for more information on basic bridge measurements.

  • Page 28: Wiring For Single-Ended Voltage Measurements Crbasic Example

    Appendix B. Example Programs TABLE B-1. Wiring for Single-Ended Voltage Measurements CRBasic Example AM16/32B in 4X16 Mode CR1000 Sensors Control and COM Terminals Measurement Terminals ⏚ (Signal COM ODD H Odd-numbered H terminal Sensor 1, 2, and 3 grounds Ground...

  • Page 29: Differential Voltage Measurement

    The following example is a CR1000 program. With minor adjustments, this program can be used with the CR6 series, CR800 series, or CR3000. The AM16/32B must be in 2x32 mode. Notice this program uses arrays for multipliers and offsets. This allows you to adjust multipliers and offsets for each sensor individually.

  • Page 30: Half-Bridge Measurement

    Appendix B. Example Programs CRBasic Example B-2. Differential Voltage Measurements 'Declare Variables and Units Public BattV Public PTemp_C Public LCount Public DiffV(32) Public Mult(32)={9,1,8,8,8,1,5,2,8,5,3,6,2,6,5,5,2,9,1,7,8,8,2,3,9,2,8,1,7,2,7,4} Public Offs(32)={5,4,9,8,4,1,1,1,7,4,8,2,6,9,7,5,9,2,3,5,2,1,9,3,8,4,3,6,5,9,3,3} Units BattV=Volts Units PTemp_C=Deg C Units DiffV=mV 'Define Data Tables DataTable(Table1,True,-1) DataInterval(0,60,Min,10) Sample(32,DiffV(),FP2) EndTable DataTable(Table2,True,-1) DataInterval(0,1440,Min,10) Minimum(1,BattV,FP2,False,False)
  • Page 31 CR800 series, CR1000, or CR3000. This program measures 48 Campbell Scientific 107 temperature sensors through an AM16/32B. The AM16/32B must be in 4x16 mode. TABLE B-3. Wiring for Campbell Scientific 107 Temperature Sensors CRBasic Example AM16/32B in 4X16 Mode Sensors...

  • Page 32: Full-Bridge Measurement

    B.4 Full-Bridge Measurement Up to sixteen full-bridge measurements may be multiplexed through the AM16/32B. A problem with making full-bridge measurements with this configuration is that the resistance of the lead wire and multiplexer relays can cause a voltage drop, reducing the excitation at the bridge. The following section describes a configuration that compensates for this by measuring the excitation at the bridge.
  • Page 33 The following example is a CR1000 program. With minor adjustments, this program can be used with the CR6 series, CR800 series, or CR3000. This program measures 16 load cell sensors through an AM16/32B. The AM16/32B must be in 4x16 mode.
  • Page 34 Appendix B. Example Programs SampleFieldCal EndTable 'Main Program BeginProg 'Initialize calibration variables for 'Generic Full Bridge measurements 'LoadCell()' on the AM16/32 Multiplexer CIndex=1 : CAvg=1 : CReps=16 LCount = 1 COff(LCount)=Offs(LCount) Next 'Load the most recent calibration values from the CalHist table FCLoaded=LoadFieldCal(True) 'Main Scan Scan(10,Sec,1,0)
  • Page 35 The following example is a CR1000 program. With minor adjustments, this program can be used with the CR6 series, CR800 series, or CR3000. This program measures 48 Campbell Scientific CS616 water content reflectometers through an AM16/32B. The AM16/32B must be in 4x16 mode. See CRBasic Example and TABLE for a related program and wiring diagram, or use Short Cut to create your own.

  • Page 36: Cr5000 Program Example

    Table2 NextScan EndProg B.5 CR5000 Program Example This CR5000 program uses the AM16/32B in 4x16 mode to measure 16 100 Ω Platinum Resistance Thermometers (PRTs). See TABLE for wiring. TABLE B-6. Wiring for CR5000 Program Example AM16/32B in 4X16 Mode...
  • Page 37 CRBasic Example B-6. CR5000 Program Example 'CR5000 Example Program to measure 16 100-ohm Platinum Resistance Thermometers 'connected to an AM16/32B multiplexer used in the 4x16 configuration. The program also 'measures 6 copper constantan thermocouples. 'The Thermocouples are connected to differential channels 1-6.
  • Page 38 Appendix B. Example Programs B-12...

  • Page 39: Thermocouple Measurement

    The CR6, CR1000, CR800, CR850, CR3000, and CR5000 have built-in temperature references. When the reference junction is located at the datalogger, the signal wires between the datalogger and the AM16/32B must be of the same wire type as the thermocouple (FIGURE C-1). The “polarity” of...

  • Page 40: Am16/32B Reference

    AM16/32B (using 107-L thermistor) C.1.3 AM16/32B Reference An external reference, usually a thermistor, can be located at the AM16/32B, as shown in FIGURE C-2. This approach requires an additional single-ended datalogger input to measure the reference. Position the reference next to the...

  • Page 41: C-3. Am16/32B Aluminum Cover Plate

    Appendix C. Thermocouple Measurement AM16/32B is housed in a field enclosure, the enclosure should be shielded from solar radiation. FIGURE C-3. AM16/32B aluminum cover plate...
  • Page 42 Appendix C. Thermocouple Measurement...
  • Page 44 Santo Domingo, Heredia 40305 SOUTH AFRICA COSTA RICA • cleroux@csafrica.co.za • info@campbellsci.cc www.campbellsci.co.za www.campbellsci.cc Campbell Scientific Southeast Asia Co., Ltd. Campbell Scientific Ltd. 877/22 Nirvana@Work, Rama 9 Road Campbell Park Suan Luang Subdistrict, Suan Luang District 80 Hathern Road Bangkok 10250...

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