1. Manuals
  2. Brands
  3. Campbell Manuals
  4. Multiplexer
  5. AM16B
  6. Product manual

Campbell AM16B Product Manual

Relay multiplexer
Hide thumbs Also See for AM16B:
Table of Contents

Advertisement

Quick Links

Download this manual
PRODUCT MANUAL
AM16/32B
Relay Multiplexer
Revision: 07/2024
Copyright © 1987 – 2024
Campbell Scientific, Inc.

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the AM16B and is the answer not in the manual?

Questions and answers

Related Manuals for Campbell AM16B

Summary of Contents for Campbell AM16B

  • Page 1 PRODUCT MANUAL AM16/32B Relay Multiplexer Revision: 07/2024 Copyright © 1987 – 2024 Campbell Scientific, Inc.
  • Page 2 U.S. standard external power supply details where some information (for example the AC transformer input voltage) will not be applicable for British/European use. Please note, however, that when a power supply adapter is ordered from Campbell Scientific it will be suitable for use in your country.

  • Page 3: Table Of Contents

    Table of contents 1. Introduction 1.1 Typical applications 1.2 Compatibility 2. Precautions 3. Initial inspection 4. QuickStart 5. Overview 6. AM16/32B specifications 7. Installation 7.1 Wiring to data logger 7.1.1 Control terminals 7.1.2 COM terminals 7.1.3 Measurement terminals 7.2 Grounding 7.3 Power supply 7.4 Installation in enclosure 8.
  • Page 4 Appendix A. Importing Short Cut code into CRBasic Editor Appendix B. Example measurements and programs B.1 Single-ended voltage measurement B.2 Differential voltage measurement B.3 Half-bridge measurement B.4 Full-bridge measurement B.5 CS616 measurement Appendix C. Thermocouple measurement C.1 Measurement considerations C.1.1 Reference junction C.1.2 Data logger reference C.1.3 AM16/32B reference C.1.4 Thermal gradients...

  • Page 5: Introduction

    1. Introduction The primary function of the AM16/32B multiplexer (also known as a mux) is to increase the number of sensors that can be measured by CR6, CR3000, CR1000X, CR800-series, CR300-series, and CR1000 data loggers. The AM16/32B is positioned between the sensors and the data logger. Mechanical relays in the AM16/32B connect each of the sensor channels in turn to a common output to the data logger.

  • Page 6: Compatibility

    1.2 Compatibility The AM16/32B is compatible with Campbell Scientific CR6, CR3000, CR1000X, CR800-series, CR300-series, and CR1000 data loggers. The AM16/32B is compatible with a wide variety of commercially available sensors. As long as relay contact current maximums are not exceeded (see Precautions [p.

  • Page 7: Quickstart

    Differential voltage measurement (p. 26) for CR300-series programming examples. This section will demonstrate programming a data logger to measure 6 Campbell Scientific 107 temperature sensors using a multiplexer. With minor changes, these steps can also be applied to other measurements and data loggers.
  • Page 8 United States and areas using 60 Hz 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 the best option outside Europe. AM16/32B Relay Multiplexer...
  • Page 9 To change the first notch frequency or sensor support option for future programs, use the Program menu. Select the data logger model in the Datalogger Model drop-down list. This tutorial uses the CR6-series data logger. The Progress Bar is used to track the progress of the program being created.
  • Page 10 The next window displays Available Sensors and Devices. Expand a folder by clicking on the symbol. Expand the Devices folder, then double-click on the AM16/32 to add it to the Selected panel. When the AM16/32 multiplexer is added as a device, a new AM16/32 tab will appear at the bottom of the Available Sensors and Devices pane.
  • Page 11 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 dialog window to accept the default name of T107_C and the default units of Deg C.
  • Page 12 After adding the measurements, click Wiring Diagram to see how the sensors are wired to the AM16/32B and how the AM16/32B is wired to the data logger. The data logger tab (CR6 Series in this example) shows the connection between the AM16/32B and the data logger, and the AM16/32 tab shows the sensor connection to the AM16/32B.
  • Page 13 Click on Sensors in the Progress list to return to the sensor-selection screen. Select any other sensors being installed in the Sensors section. Add sensors to the data logger by selecting the data logger tab (CR6 in this example). Add sensors to the multiplexer by selecting the AM16/32 tab.

  • Page 14: Overview

    If LoggerNet, RTDAQ, or PC400 is running on the computer and the computer-to­ - data-logger connection is active, click Finish in Short Cut, and a prompt will appear to send the program just created to the data logger. After powering on and sending the program to the data logger, check the output of sensors in the data logger support software data display to make sure the measurements are within the expected range.

  • Page 15: Am16/32B Specifications

    sensor and sensor-shield connections. All of the inputs of the AM16/32B are protected against surges with transient suppression. Data-logger-to-AM16/32B cabling requires a minimum of six and as many as nine individually insulated wires with shields. Figure 5-1. AM16/32B Relay Multiplexer 6.
  • Page 16 Operational temperature Standard: –25 to 50 °C Extended: –55 to 85 °C Operational humidity: 0 to 95%, non-condensing Dimensions Length: 23.9 cm (9.4 in) Width: 10.2 cm (4.0 in) Depth: 4.6 cm (1.8 in) Weight: 680 g (1.5 lb) (approx.) Mounting tab hole spacing: 1 x 3 x 9 in.

  • Page 17: Installation

    Assumes sequential activation of multiplexers and that each data logger channel is uniquely dedicated. If the application requires additional multiplexing capability, please consult Campbell Scientific for application assistance. Switching currents greater than 30 mA (occasional 50 mA current is acceptable) will degrade the contact surfaces of the mechanical relays and increase their resistance.

  • Page 18: Wiring To Data Logger

    For more information on wiring a data logger to a multiplexer, watch a video at www.campbellsci.com/videos/wiring-a-datalogger-to-a-multiplexer 7.1.1 Control terminals Table 7-1 (p. 14) shows control connections to Campbell Scientific data loggers. Table 7-1: Control terminal function and data logger connection Control terminal Function...

  • Page 19: Com Terminals

    7.1.2 COM terminals The four terminals dedicated to multiplexer-data-logger connection are located under the blue COM label next to the mode switch. The terminals are labeled: ODD H/L and EVEN H/L. In 4x16 mode, the AM16/32B maintains the four COM terminals electrically isolated from one another. In 2x32 mode, the AM16/32B maintains an internal connection between ODD H and EVEN H and between ODD L and EVEN L.

  • Page 20: Grounding

    7.2 Grounding Connect the AM16/32B ground lug to earth ground via an 8 AWG wire. Keep this connection as short as possible. The ground lug provides a path to dissipate surges that might propagate on a sensor shield line. A 35 V varistor is connected internally between the shield ground and the ground lug to provide surge suppression.

  • Page 21: Operation

    Figure 7-2. Example of an AM16/32B multiplexer and a CR1000X data logger mounted in an enclosure. In this example, the wiring between the AM16/32B and the data logger is configured for differential voltage measurements. Refer to Example measurements and programs (p.
  • Page 22 low-power state, the common (COM) terminals are electrically disconnected from all the sensor input channels. Always connect RES to a data logger terminal configured for control. MuxSelect() instruction is used to turn on the AM16/32B and advance to the channel specified in the instruction.

  • Page 23: Programming

    8.1 Programming The following sections describe the available programming methods and general considerations for programming and measuring with the AM16/32B. 8.1.1 Short Cut programs 8.1.2 Using CRBasic MuxSelect() instruction 8.1.3 General programming considerations 8.1.4 Mixed sensor types 8.1.1 Short Cut programs In most cases, Short Cut is the best way to create or begin data logger programs for the AM16/32B multiplexer.
  • Page 24 'Turn AM16/32B Multiplexer on PortSet(C2,1) 'Delay command inserted by Short Cut. 'Not required by AM16/32B and may be removed to increase program speed. Delay(0,150,mSec) 'Reset counter LCount=1 'Begin measurement loop SubScan(0,uSec,5)  'measures 5 sets 'Switch to next AM16/32B Multiplexer channel PulsePort(C1,10000) 'Make measurements 'Increment counter according to measurement mode   LCount=LCount+1...

  • Page 25: Using Crbasic Muxselect() Instruction

    Example 2 'Example 2 LCount = 1 SubScan (0,uSec,7) PulsePort (C1,10000) VoltDiff (Dest(LCount),2,mV5000,1,True ,0,60,1.0,0)   LCount = LCount + 2 NextSubScan With the multiplexer in 4x16 mode, differential voltage measurements will be made on the first SubScan() instruction is 7. seven 4x16 terminal groups because the Count parameter of the VoltDiff() Two differential sensors are measured per terminal group because the instruction...

  • Page 26: Mixed Sensor Types

    8.2.2 Completion resistors In some applications, it is advantageous to place completion resistors at the AM16/32B terminal strips. Certain sensors specific to the use of multiplexers are available from Campbell Scientific. Examples include soil moisture probes and thermistor probes. 8.2.3 Contact degradation Once excitation in excess of 30 mA has been multiplexed, that channel relay contacts are...

  • Page 27: Appendix A. Importing Short Cut Code Into Crbasic Editor

    Appendix A. Importing Short Cut code into CRBasic Editor Short Cut creates a .DEF file that contains wiring information and a program file that can be imported into CRBasic Editor. By default, these files reside in the C:\campbellsci\SCWin folder. Import Short Cut program file and wiring information into CRBasic Editor: 1.

  • Page 28: Appendix B. Example Measurements And Programs

    In all cases, is used at the end of each scan to turn the multiplexer off (Low). The example programs are downloadable from the Campbell Scientific website: www.campbellsci.com/downloads/am16-32b-example-programs . A single Zip archive contains all the example programs referenced in this manual.
  • Page 29 Alternatively, use Short Cut to create the program. With minor adjustments, the CR1000X program can be used with the CR6, CR3000, CR800 series, or CR1000. In either case, the AM16/32B must be in 4x16 mode. View the program in the CRBasic Editor. Figure B-1.

  • Page 30: Differential Voltage Measurement

    Table B-1: Wiring for single-ended voltage measurements CRBasic example AM16/32B in 4X16 mode Control and COM Measurement CR1000X CR300 Sensors terminals terminals B.2 Differential voltage measurement Figure B-2 (p. 26) shows a typical connection for differential voltage measurements. Using this method, a data logger can make up to 32 differential voltage measurements through a multiplexer.

  • Page 31: Half-Bridge Measurement

    With minor adjustments, the CR6 program can be used with the CR3000, CR1000X, CR800 series, CR300 series, or CR1000. This program measures 48 Campbell Scientific 107 temperature sensors through an AM16/32B. The AM16/32B must be in 4x16 mode.

  • Page 32: Full-Bridge Measurement

    NOTE: U terminals are only available on the CR6 data logger. Table B-3: Wiring for Campbell Scientific 107 temperature sensors CRBasic example AM16/32B in 4X16 mode Sensors Control and COM Measurement terminals terminals Odd-numbered Sensor 1, 2, and 3 excitation...

  • Page 33: Cs616 Measurement

    B.5 CS616 measurement Example AM16-32B Example B-7 CR1000X CS616 measurements.CR1X is a CR1000X program measuring 48 Campbell Scientific CS616 water content reflectometers through an AM16/32B. With minor adjustments, this program can be used with the CR6, CR3000, CR800-series, or CR1000. The AM16/32B must be in 4x16 mode. See AM16-32B Example B-7 CR1000X CS616...
  • Page 34 measurements.CR1X and Table B-5 (p. 30) for the program and wiring diagram, or use Short Cut to create the program. Table B-5: Wiring for CS616 sensor CRBasic example AM16/32B in 4X16 mode Control and COM Measurement Sensors CR1000X terminals terminals Sensor 1, 2, and 3 COM ODD H Odd-numbered H...

  • Page 35: Appendix C. Thermocouple Measurement

    NOTE: The AM16/32B is not recommended for making highly accurate thermocouple measurements. Instead, Campbell Scientific recommends the AM25T, which uses an onboard PRT as a reference junction. C.1 Measurement considerations Proper reference junction configurations are critical for accurate thermocouple measurements.
  • Page 36 When the reference junction is located at the data logger, the signal wires between the data logger and the AM16/32B must be of the same wire type as the thermocouple (Figure C-1 [p. 32]). The “polarity” of the thermocouple wires must be maintained on each side of the multiplexer (for example, if constantan wire is input to an L terminal, then a constantan wire should run between the multiplexer COM ODD L terminal and the data logger measurement terminal).

  • Page 37: Am16/32B Reference

    Figure C-2. Differential thermocouple measurement with reference junction at the 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 (p. 33). This approach requires an additional single-ended data logger input to measure the reference.
  • Page 38 Figure C-3. AM16/32B aluminum cover plate AM16/32B Relay Multiplexer...
  • Page 39 2. The defect cannot be the result of misuse. 3. The defect must have occurred within a specified period of time; and 4. The determination must be made by a qualified technician at a Campbell Scientific Service Center/ repair facility.
  • Page 40 Campbell Scientific’s Terms, the provisions of Campbell Scientific’s Terms shall prevail. Furthermore, Campbell Scientific’s Terms are hereby incorporated by reference into this Warranty. To view Terms and conditions that apply to Campbell Scientific, Logan, UT, USA, see Terms and Conditions ...
  • Page 41 Please state the faults as clearly as possible. 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, when equipment is returned to Campbell Scientific, Logan, UT, USA, it is mandatory that a “Declaration of Hazardous Material and...
  • Page 42 Comply with all electrical codes. Electrical equipment and related grounding devices should be installed by a licensed and qualified electrician. Only use power sources approved for use in the country of installation to power Campbell Scientific devices. Elevated Work and Weather Exercise extreme caution when performing elevated work.
  • Page 43 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,...
  • Page 44 Campbell Scientific Regional Offices Australia France Spain Location: Garbutt, QLD Australia Location: Montrouge, France Location: Barcelona, Spain Phone: 61.7.4401.7700 Phone: 0033.0.1.56.45.15.20 Phone: 34.93.2323938 Email: info@campbellsci.com.au Email: info@campbellsci.fr Email: info@campbellsci.es Website: www.campbellsci.com.au Website: www.campbellsci.fr Website: www.campbellsci.es Brazil Germany Thailand Location: São Paulo, SP Brazil...

This manual is also suitable for:

Am32b

Table of Contents