Campbell AM16/32B Product Manual
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Campbell AM16/32B Product Manual

Relay multiplexer
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AM16/32B
Relay Multiplexer
Revision: 12/20
Copyright © 1987 – 2020
Table of Contents – i
Campbell Scientific, Inc.

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  • Page 1 AM16/32B Relay Multiplexer Revision: 12/20 Copyright © 1987 – 2020 Table of Contents – i Campbell Scientific, Inc.

  • Page 2: Table Of Contents

    Typical applications ............................. 1 Compatibility ..............................1 Precautions ..............................2 Initial inspection ............................2 QuickStart ............................... 3 Overview ................................. 9 AM16/32B specifications ..........................10 Installation ..............................12 Wiring to data logger ..........................13 7.1.1 Control terminals ..........................13 7.1.2 COM terminals ............................13 7.1.3...
  • Page 3 Table B-1. Wiring for single-ended voltage measurements CRBasic example ........22 Table B-2. Wiring for differential voltage measurements CRBasic example ........... 23 Table B-3. Wiring for Campbell Scientific 107 temperature sensors CRBasic example ......25 Table B-4. Wiring for Load Cells CRBasic Example ..................26 Table B-5.

  • Page 4: Introduction

    A slide switch located on the AM16/32B 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 5: Precautions

    Changing the setting of the mode switch from 4x16 to 2x32 connects COM ODD H to COM EVEN H and also COM ODD L to COM EVEN L. After wiring the AM16/32B, exercise due care to avoid inadvertently putting excess voltage on a line or short-circuiting a power supply, which might damage connected devices such as data logger, wiring panel, sensor, or multiplexer, and which would not be covered under warranty.

  • Page 6: Quickstart

    CR3000, CR1000X, CR800-series, and CR1000 data loggers when creating a program to take Short Cut measurements through an AM16/32B. does not include support for programming the CR300-series to use the AM16/32B. To use the AM16/32B with the CR300 series, the program CRBasic Editor must be created in the . See Single-ended voltage measurement (p.
  • Page 7 50 Hz. A second prompt lists sensor support options. Campbell Scientific, Inc. (US) is the best option outside Europe. To change the first notch frequency or sensor support option for future programs, use the Program menu. AM16/32B Relay Multiplexer...
  • Page 8 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. AM16/32B Relay Multiplexer...
  • Page 9 Double­click on 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 10 Click Next. 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...
  • Page 11 AM16/32 tab. Short Cut Finish the remaining steps to complete the program. The remaining steps are outlined in Short Cut Help , which is accessed by clicking on Help > Short Cut Help > Contents > Programming Steps. AM16/32B Relay Multiplexer...

  • Page 12: Overview

    5. Overview Under data logger control, the AM16/32B sequentially connects terminal pairs or groups to data logger terminals. This effectively expands the number of terminals available on a data logger. FIGURE 5-1 shows the wiring panel of the AM16/32B multiplexer.

  • Page 13: Am16/32B Specifications

    Reset (RES) 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 14 4 AM16/32Bs per CR6 4 AM16/32Bs per CR3000 4 AM16/32Bs per CR1000X 2 AM16/32Bs per CR800/CR850 1 AM16/32B per CR300 4 AM16/32Bs per CR1000 Maximum cable length: Depends on sensor and scan rate. In general, longer cable lengths necessitate longer measurement delays. Refer to data logger and sensor manuals for details.

  • Page 15: 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 16: Wiring To Data Logger

    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. How the COM terminals connect to data logger terminals determines the function of the measurement terminals.

  • Page 17: Measurement Terminals

    (p. 21) for examples. 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.

  • Page 18: Installation In Enclosure

    AM16/32B and into the included grommets. 8. 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 low-power, low current-drain state. In the low- power state, the common (COM) terminals are electrically disconnected from all the sensor input channels.

  • Page 19: Programming

    ODD terminals while the even terminals (6H, 6L) are switched to the COM EVEN terminals. When activated by the RES line, as the AM16/32B receives clock pulses from the data logger, each SET of four in turn is switched into contact with the four COM terminals. For example, when the first clock pulse is received from the data logger, SET 1, consisting of 1H, 1L, 2H, and 2L, is connected to COM ODD H, ODD L, EVEN H, and EVEN L terminals respectively.
  • Page 20 '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...

  • Page 21: Using Crbasic Muxselect() Instruction

    PulsePort() instruction to disable it. The generalized programming sequence follows: PortSet() 'Turn AM16/32B Multiplexer on, C1-CLK, C2-RES 'Advance to first measurement channel in SET 1 MuxSelect (C1, C2 ,20,1,1) 'Make SET 1 measurements '<insert measurement instruction(s)>...

  • Page 22: Mixed Sensor Types

    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: Appendix A. Importing Short Cut Code Into Crbasic Editor

    Block. This adds an apostrophe (') to the beginning of each of the highlighted lines, which instructs the data logger compiler to ignore those lines when compiling. The Comment Block feature is demonstrated at about 5:10 in the CRBasic | Features video . AM16/32B Relay Multiplexer...

  • Page 24: Appendix B. Example Measurements And Programs

    The figures in this section do not show the wire connections between the data logger and AM16/32B control terminals. Only the path for each sensor through the AM16/32B to the data logger is shown. Control wiring is shown in the table giving the wiring for each example.

  • Page 25: Figure B-1. Typical Single-Ended Voltage Measurement Connection

    FIGURE B-1. Typical single-ended voltage measurement connection Table B-1. Wiring for single-ended voltage measurements CRBasic example AM16/32B in 4X16 mode CR1000X CR300 Sensors Control and Measurement COM terminals terminals ⏚ (Signal ⏚ (Signal Odd-numbered COM ODD H Sensor 1, 2, and 3 grounds...

  • Page 26: Differential Voltage Measurement

    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 2x32 mode. View CRBasic Editor the program in the FIGURE B-2.

  • Page 27: 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 28: Full-Bridge Measurement

    With minor adjustments, the CR1000X program can be used with the CR6, CR3000, CR800 series, CR300 series, or CR1000. This program measures 16 load cell sensors through an AM16/32B. The AM16/32B must be in 4x16 mode.

  • Page 29: Cs616 Measurement

    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 measurements.CR1X Short Cut...

  • Page 30: Table B-5. Wiring For Cs616 Sensor Crbasic Example

    Table B-5. Wiring for CS616 Sensor CRBasic Example AM16/32B in 4X16 mode CR1000X Sensors Control and COM Measurement terminals terminals Sensor 1, 2, and 3 COM ODD H Odd-numbered H Orange COM ODD L Odd-numbered L Sensor 1 Green COM EVEN H...

  • Page 31: Appendix C. Thermocouple Measurement

    Appendix C. Thermocouple measurement If the AM16/32B will be used in thermocouple measurements, the practices outlined below should be followed to make the best possible measurement. The data logger manuals contain thorough discussions of thermocouple measurement and error analysis. These topics will not be covered here.

  • Page 32: Figure C-1. Differential Thermocouple Measurement With Reference Junction At The Data Logger

    E, J, and K) may also be measured and linearized by the data loggers. It is not recommended to make measurements of any other sensor type through the AM16/32B if thermocouples are measured with respect to the data logger reference (the signal wires between the data logger and AM16/32B are made of thermocouple wire).

  • Page 33: Am16/32B Reference

    This technique allows heat to largely dissipate before it reaches the terminals. If the AM16/32B is housed in a field enclosure, the enclosure should be shielded from solar radiation.
  • Page 34 See Product Details on the Ordering Information pages at www.campbellsci.com. Other manufacturer's products, that are resold by Campbell Scientific, are warranted only to the limits extended by the original manufacturer.
  • Page 35 Campbell Scientific office serves your country. To obtain a Returned Materials Authorization or Repair Reference number, contact your CAMPBELL SCIENTIFIC regional office. Please write the issued number clearly on the outside of the shipping container and ship as directed.
  • Page 36 Dispose of spent batteries properly. 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...
  • Page 37 Campbell Scientific regional offices Australia France Thailand Location: Garbutt, QLD Australia Location: Vincennes, France Location: Bangkok, Thailand Phone: 61.7.4401.7700 Phone: 0033.0.1.56.45.15.20 Phone: 66.2.719.3399 Email: info@campbellsci.com.au Email: info@campbellsci.fr Email: info@campbellsci.asia Website: www.campbellsci.com.au Website: www.campbellsci.fr Website: www.campbellsci.asia Brazil Germany Location: São Paulo, SP Brazil...

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