Contents

Revision and Copyright Information
Warranty and Assistance
Table of Contents
Cautionary Notes
AM16/32A Relay Analog Multiplexer
- 1. Function
  - 1.1 Typical Applications
  - 1.2 Compatibility
- 2. Physical Description
- 3. AM16/32A 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
  - 5.1 Single Loop Instruction Sequence
  - 5.2 Multiple Loop Instruction Sequence
  - 5.3 CRBasic Programming
    - 5.3.1 CR5000 and CR3000 Programming
    - 5.3.2 CR1000, CR800, and CR850 Programming
  - 5.4 General Programming Considerations
- 6. Sensor Hook-up and Measurement Examples
  - 6.1 Single-Ended Analog Measurement without Sensor Excitati
  - 6.2 Differential Analog Measurement without Sensor Excitati
  - 6.3 Half Bridge Measurements
    - 6.3.1 Half Bridge Measurement with Completion Resistor at D
    - 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 Therm
- 7. General Measurement Considerations
- 8. Installation
  - 8.1 Mounting Tabs
  - 8.2 Controlling Humidity
Appendix A. AM16/32A Improvements
Campbell Scientific Contact Information

Campbell Scientific AM16/32A Instruction Manual

Campbell Scientific AM16/32A Multiplexer manual cover

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Campbell Scientific AM16/32A Multiplexer Specification

The Campbell Scientific AM16/32A Multiplexer is a robust and versatile device designed to expand the input capabilities of dataloggers. It facilitates the connection of multiple sensors to a single datalogger channel by sequentially switching each sensor into a common output. This multiplexer is capable of supporting up to 32 single-ended or 16 differential measurements, providing significant flexibility for various data acquisition applications. It integrates seamlessly with Campbell Scientific dataloggers, enhancing data collection efficiency in complex monitoring systems.

The AM16/32A is equipped with a durable, weather-resistant enclosure, making it suitable for both indoor and outdoor use in harsh environmental conditions. It can handle a wide range of sensor types, including thermocouples, thermistors, and resistive bridge measurements, among others. The multiplexer operates over a broad temperature range, ensuring reliability and precision in extreme climates. It features a simple design with low power consumption, making it ideal for remote or solar-powered installations.

With support for both grounded and ungrounded sensors, the AM16/32A ensures accurate measurements by minimizing noise and interference. Its compatibility with CRBasic and Edlog programming facilitates straightforward integration into existing systems. The device employs a straightforward wiring configuration that simplifies setup and maintenance. Overall, the Campbell Scientific AM16/32A Multiplexer is a highly efficient solution for expanding the sensor input capacity of dataloggers, offering reliability, flexibility, and ease of use in diverse monitoring applications.

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

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

To connect the AM16/32A Multiplexer to a datalogger, use the control lines for clock and reset, and connect the power and ground. Ensure that the datalogger is programmed to control the multiplexer for the desired channel switching.

What are the power requirements for the AM16/32A Multiplexer?

The AM16/32A requires a 12 V power supply with a typical current consumption of 9 mA when active. Ensure that the power supply is stable and capable of handling the multiplexer along with other connected devices.

How can I troubleshoot if the multiplexer is not switching channels?

First, verify the connections between the datalogger and the multiplexer. Check the control ports and ensure they are programmed correctly. Also, inspect the power connections and test with a voltmeter to ensure proper voltage supply.

What maintenance steps are recommended for the AM16/32A?

Regularly inspect the multiplexer for any signs of physical damage or corrosion. Clean the connectors and terminals to ensure good contact. Additionally, check the cabling for wear and replace if necessary.

Can the AM16/32A be used in outdoor environments?

Yes, the AM16/32A can be used in outdoor environments, but it should be housed in a weather-resistant enclosure to protect it from moisture and extreme temperatures.

How do I configure the AM16/32A for 4-wire measurements?

For 4-wire measurements, configure the AM16/32A by connecting the two sets of input terminals to the sensor's excitation and measurement lines. Ensure that the datalogger is programmed to handle the 4-wire configuration appropriately.

What should I do if the AM16/32A is not responding to the datalogger?

Check the wiring for any loose connections and verify the control lines are properly connected. Ensure that the datalogger program is correctly addressing the multiplexer. If issues persist, consult the user manual for troubleshooting steps.

How many channels can the AM16/32A Multiplexer handle?

The AM16/32A can handle up to 32 single-ended or 16 differential channels. It is important to configure it properly based on the measurement type required for your application.

Is there a specific cable length limitation for connecting sensors to the AM16/32A?

While there is no strict limitation, longer cable lengths may introduce resistance and noise. It's advisable to keep cable lengths as short as possible to minimize these effects. Use shielded cables to reduce interference.

What types of sensors can be used with the AM16/32A?

The AM16/32A Multiplexer is compatible with a wide range of sensors, including thermocouples, RTDs, thermistors, and voltage output sensors. Ensure the sensors are compatible with the multiplexer’s channel configuration.