Contents

Revision and Copyright Information
Warranty and Assistance
Table of Contents
AM16/32 Relay Analog Multiplexer
- 1. Function
  - 1.1 Typical Applications
  - 1.2 Compatibility
- 2. Physical Description
- 3. AM16/32 Specifications
- 4. Operation
  - 4.1. The Control Terminals
    - 4.1.1 Reset
    - 4.1.2 Clock
    - 4.1.3 Ground
    - 4.1.4 Power Supply
  - 4.2 Measurement Terminals
    - 4.2.1 COM Terminals
    - 4.2.2 Sensor Input Terminals
- 5. Datalogger Programming
  - 5.2 Multiple Loop Instruction Sequence
  - 5.3 CR5000 and CR1000 Programming
    - 5.3.1 CR5000 Programming
    - 5.3.2 CR1000 Programming
  - 5.4 General Programming Considerations
- 6. Sensor Hook-up and Measurement Examples
  - 6.1 Single-Ended Analog Measurement without Sensor Excitation
  - 6.2 Differential Analog Measurement without Sensor Excitation
  - 6.3 Half Bridge Measurements
    - 6.3.1 Half Bridge Measurement with Completion Resistor at Datalogger
    - 6.3.2 Potentiometer Measurement
    - 6.3.3 Four Wire Half Bridge (Measured Excitation Current)
  - 6.4 Full Bridge Measurements
  - 6.5 Full Bridges with Excitation Compensation
  - 6.6 Thermocouple Measurement
    - 6.6.1 Measurement Considerations
    - 6.6.2 Single-ended Thermocouple Measurement
    - 6.6.3 Differential Thermocouple Measurement
  - 6.7 Mixed Sensor Types
    - 6.7.1 Mixed Sensor Example: Soil Moisture Blocks and Thermocouples
- 7. General Measurement Considerations
- 8. Installation
  - 8.1 Mounting Tabs
  - 8.2 Controlling Humidity
Appendix A. AM16/32 Improvements
Campbell Scientific Contact Information

Campbell Scientific AM16/32 Instruction Manual

Campbell Scientific AM16/32 Multiplexer manual cover

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Campbell Scientific AM16/32 Multiplexer Specification

The Campbell Scientific AM16/32 Multiplexer is designed to expand the measurement capabilities of data loggers by allowing multiple sensors to be connected to a single data logger channel. It supports up to 32 single-ended or 16 differential measurements, accommodating a wide range of sensor types including thermocouples, thermistors, and resistive bridges. With a robust construction suitable for harsh environmental conditions, the AM16/32 ensures reliable operation in field applications.

It features a solid-state switching system that enhances durability and minimizes maintenance needs. The multiplexer operates at a control voltage range of 4.5 to 5.5 V, sourced from the data logger, ensuring compatibility with various data logging systems. The switching time for the AM16/32 is approximately 20 milliseconds, allowing for efficient data acquisition from multiple sensors.

The AM16/32 supports both serial and parallel modes of operation, providing flexibility in measurement configurations. In serial mode, sensors are scanned sequentially, while in parallel mode, multiple sensors can be scanned simultaneously, optimizing the data collection process for specific applications. The device also features an operating temperature range of -25°C to 50°C, making it suitable for a wide range of environmental conditions.

Integration with Campbell Scientific data loggers is seamless, facilitated by the included control and signal cables. An integrated terminal strip provides easy connection to sensors, while the compact design allows for easy installation in field enclosures. The AM16/32 is designed to meet stringent industry standards, ensuring accuracy and reliability in data collection for scientific research and environmental monitoring applications. This multiplexer is an essential component for expanding data collection capabilities in complex monitoring systems.

Campbell Scientific AM16/32 Multiplexer F.A.Q.

How do I connect the Campbell Scientific AM16/32 Multiplexer to a datalogger?

To connect the AM16/32 Multiplexer to a datalogger, use the provided ribbon cables to connect the multiplexer’s control ports to the control ports on the datalogger. Ensure that the power supply is connected and that all connections are secure to ensure reliable data transmission.

What is the purpose of using a multiplexer like the AM16/32 in a data collection system?

The AM16/32 Multiplexer allows a single datalogger to measure multiple sensors by sequentially switching between them, thus expanding the number of sensors that can be read without the need for additional dataloggers.

What troubleshooting steps can I take if the multiplexer is not switching channels correctly?

First, check all cable connections for security and proper configuration. Verify that the datalogger program is correctly set up to control the multiplexer. Ensure that the power supply is adequate and that there is no physical damage to the unit.

How can I test if my multiplexer is functioning properly?

Use a known working sensor and channel to test the multiplexer by manually switching channels and checking if the datalogger receives the correct signals. Additionally, reviewing the datalogger's logs for any error messages can help diagnose issues.

What maintenance is recommended for the AM16/32 Multiplexer?

Regularly inspect the unit for physical damage, clean connectors to ensure good electrical contact, and verify that all screws and mounting points are secure. It is also advisable to perform periodic functional checks to ensure proper operation.

Can the AM16/32 Multiplexer be used in harsh environmental conditions?

Yes, the AM16/32 is designed for use in various environmental conditions, but it should be housed in a weather-resistant enclosure for protection against moisture, dust, and extreme temperatures.

How does the AM16/32 handle power supply issues?

The AM16/32 requires a stable power supply for optimal performance. It should be connected to a power source that matches its voltage and current specifications. An uninterruptible power supply (UPS) or battery backup is recommended to prevent data loss during power interruptions.

What software can be used to configure the AM16/32 Multiplexer?

Campbell Scientific's LoggerNet software is commonly used to configure the AM16/32 Multiplexer, allowing users to set up and manage communication between the multiplexer and dataloggers.

How do I expand the channel capacity of my current data collection system using the AM16/32?

To expand the channel capacity, connect the AM16/32 to your datalogger and configure it to sequentially switch through additional sensors. This allows one datalogger to read from multiple inputs without needing additional hardware.

What is the maximum cable length I can use with the AM16/32 Multiplexer?

The maximum cable length depends on the signal type and environment but generally should not exceed 100 meters. Longer cables may require signal conditioning or amplification to maintain data integrity.