Contents

Revision and Copyright Information
Limited Warranty
Assistance
Safety
Table of Contents
1. Introduction
- 1.1 Typography
- 1.2 Product Series
2. Precautions
3. Initial Inspection
4. Overview
- 4.1 Input Channels
- 4.2 Dynamic Sample Rates
- 4.3 Static Measurement
- 4.4 Embedded Thermistor or RTD
- 4.5 Rainflow Histograms
- 4.6 Diagnostics
- 4.7 Data Use
5. Specifications
6. Installation
- 6.1 Power Supply Tips
- 6.2 Installation Tips
- 6.3 Bench Test
  - 6.3.1 Bench Test Equipment
  - 6.3.2 Bench Test Procedure
- 6.4 Field Installation
  - 6.4.1 Field Installation Equipment
  - 6.4.2 Field Installation Procedure
7. Operation
- 7.1 CDM-VW300 Sample Rate
- 7.2 CDM-VW300 Settings
- 7.3 CDM-VW300 Outputs
- 7.4 Connections
  - 7.4.1 Sensor Connections
  - 7.4.2 CPI Connections
    - 7.4.2.1 CPI Speed
    - 7.4.2.2 CPI Network Status
    - 7.4.2.3 CPI Network Reset
  - 7.4.3 Power Connections
  - 7.4.4 Ground Connections
  - 7.4.5 Computer Connection
- 7.5 Analyzer and Channel Numbers
- 7.6 Datalogger Program
  - 7.6.1 Program Code
    - 7.6.1.1 Pipeline Mode
    - 7.6.1.2 CDM_VW300Config()
    - 7.6.1.3 Scan()
    - 7.6.1.4 CDM_VW300Dynamic()
    - 7.6.1.5 CDM_VW300Static()
    - 7.6.1.6 CDM_VW300RainFlow()
    - 7.6.1.7 RainFlowSample()
    - 7.6.1.8 CPISpeed()
    - 7.6.1.9 Processing Diagnostic Codes
  - 7.6.2 Sending Programs to the Datalogger
- 7.7 Data Quality
  - 7.7.1 Amplitude Warning Flags
  - 7.7.2 Diagnostic Codes
    - 7.7.2.1 Inside Diagnostic Codes
    - 7.7.2.2 Creating the Diagnostic Code Variable Array
    - 7.7.2.3 Decoding Excitation Strength
    - 7.7.2.4 Decoding Warning Flags
  - 7.7.3 DVWTool Errors
  - 7.7.4 Excitation Strength
  - 7.7.5 Frequency Filters
    - 7.7.5.1 Harmonics
    - 7.7.5.2 Estimated-Frequency Range
    - 7.7.5.3 Actual-Frequency Range
    - 7.7.5.4 Matching Estimated and Actual-Frequency Ranges
  - 7.7.6 Frequency Warning Flags
  - 7.7.7 Sample Rate and Noise Performance
  - 7.7.8 Standard Deviation
- 7.8 Operating Systems
- 7.9 Power Supplies
  - 7.9.1 CDM-VW300 Power Supply
  - 7.9.2 Field Station Power Supplies
- 7.10 Power-Up Sequence
- 7.11 Sensors
  - 7.11.1 Sensor Basic Design Features
  - 7.11.2 Basic Measurement of the Sensor
  - 7.11.3 Vibrating Wire Length and Tension
  - 7.11.4 Sensor Output Frequency Range and Maximum Sample Rate
  - 7.11.5 Sensor Versatility
  - 7.11.6 Temperature Sensor
- 7.12 Station Validation
  - 7.12.1 Monitoring System Performance
  - 7.12.2 Status of Input Channels and Sensors
8. Troubleshooting
- 8.1 Connections
- 8.2 CPI Network
- 8.3 Factory Default Reset
- 8.4 Fault Detection
- 8.5 Isolating Components
- 8.6 Power
- 8.7 Repair
9. Glossary
10. References and Attributions
Appendix A. Typography
Appendix B. VSPECT Measurement Theory
- B.1 Dynamic Vibrating Wire Measurement
Appendix C. Vibrating Wire Digits Conversion
Appendix D. Calculating Vibrating Wire Measurement Error
- D.2 Error Example: Geokon Strain Gage
- D.3 Error Example: DGSI Embedment Strain Gage
- D.4 Error Example: DGSI Spot-Welded Strain Gage
- D.5 Error Example: Geokon 4420 Crack Meter
- D.6 Error Example: DGSI Piezometer 52611099
Appendix E. Measuring Thermistors and RTDs
- E.1 Converting RTD Resistance to Temperature
- E.2 Converting Thermistor Resistance to Temperature
  - E.2.1 Thermistor Measurement Accuracy and Resolution
Appendix F. CRBasic Program Examples
- F.1 20 Hz Measurement Example One CDM-VW305, Eight Channels
- F.2 50 Hz Measurement Example Three CDM-VW305s, 24 Channels
- F.3 50 Hz Diagnostic Example One CDM-VW300, Two Geokon 4000 Sensors with FieldCal()
Appendix G. Supplemental Hardware and Software
- G.1 Dataloggers
- G.2 Datalogger Support Software
- G.3 Items Often Sold With the CDM-VW300
Campbell Scientific Regional Offices

Campbell Scientific CDM-VW300 VSPECT Product Manual

Campbell Scientific CDM-VW300 VSPECT Peripheral manual cover

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Campbell Scientific CDM-VW300 VSPECT Peripheral Specification

The Campbell Scientific CDM-VW300 VSPECT Peripheral is an advanced vibrating wire sensor interface designed for high-precision measurement applications. It integrates seamlessly with Campbell Scientific data loggers, utilizing the CAN (Controller Area Network) bus for efficient communication. This peripheral is specifically engineered to support up to eight vibrating wire sensors, offering unparalleled accuracy and reliability in data acquisition processes. The CDM-VW300 features Campbell Scientific's proprietary VSPECT technology, which enhances signal quality by providing superior noise rejection and signal resolution. This ensures that the peripheral delivers precise and stable measurements, even in challenging environmental conditions.

The peripheral's robust design ensures durability and performance in harsh field environments, with an operational temperature range suitable for a variety of field applications. It is powered directly through the CAN bus, simplifying setup and reducing the need for additional power supplies. The CDM-VW300 is equipped with advanced diagnostic capabilities, allowing for real-time monitoring of sensor performance and system health. This feature greatly aids in the early detection of potential issues, ensuring long-term reliability and reduced maintenance costs.

With a compact form factor, the CDM-VW300 can be easily integrated into existing monitoring systems, providing a scalable solution for expanding data collection capabilities. It supports easy configuration through Campbell Scientific's LoggerNet software, facilitating straightforward deployment and management. The peripheral is ideal for geotechnical, structural, and environmental monitoring applications, where precise and reliable data collection is paramount. Overall, the CDM-VW300 VSPECT Peripheral represents a state-of-the-art solution for vibrating wire sensor interfacing, combining cutting-edge technology with robust engineering to meet the demanding needs of modern data acquisition systems.

Campbell Scientific CDM-VW300 VSPECT Peripheral F.A.Q.

What is the primary function of the CDM-VW300 VSPECT Peripheral?

The CDM-VW300 is designed to interface vibrating wire sensors with Campbell Scientific data loggers, providing precise measurements in geotechnical and structural health monitoring applications.

How do you connect the CDM-VW300 to a data logger?

The CDM-VW300 connects to a data logger via the SDM (Synchronous Device for Measurement) interface, using the appropriate cables to ensure secure and reliable data transmission.

What troubleshooting steps should be taken if the CDM-VW300 is not responding?

First, check all cable connections for security and integrity. Ensure that the power supply is adequate. Verify that the data logger is correctly configured, and update the firmware if necessary.

How can I ensure accurate data collection with the CDM-VW300?

Regularly calibrate the sensors connected to the CDM-VW300, and ensure that the setup is free from electromagnetic interference. Use shielded cables and follow installation guidelines provided by Campbell Scientific.

What maintenance is required for the CDM-VW300?

Routine maintenance includes checking cable connections, inspecting for physical damage, cleaning connector interfaces, and verifying the integrity of sensor readings periodically.

Can the CDM-VW300 support multiple sensors simultaneously?

Yes, the CDM-VW300 can accommodate multiple vibrating wire sensors, typically up to four, depending on the specific configuration and requirements of the monitoring system.

What should I do if data from the CDM-VW300 is inconsistent?

Check for loose connections, ensure the sensors are properly installed, review the data logger configuration, and inspect for environmental factors that could affect sensor readings.

How do I update the firmware on the CDM-VW300?

To update the firmware, connect the CDM-VW300 to a computer with the appropriate software from Campbell Scientific, and follow the firmware update instructions provided in the user manual.

Is it possible to integrate the CDM-VW300 with third-party software applications?

Yes, data from the CDM-VW300 can be exported and integrated into third-party software applications, provided that the software supports the data formats used by Campbell Scientific.

What environmental conditions can the CDM-VW300 withstand?

The CDM-VW300 is designed to operate in harsh environments, including extreme temperatures, humidity, and dust, but users should refer to the specific environmental specifications in the product manual for detailed limitations.