Campbell CDM-VW300 Series, User Manual

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1
CDM-VW300 Series Dynamic Vibrating-
Wire Analyzers
Configuring a dynamic vibrating-wire measurement system requires an integrated
system-wide approach. Please review this manual before connecting hardware
together or to the PC. The
ResourceDVD , which ships free of charge with most
Campbell Scientific instrumentation orders, contains the following tools that will
help you configure a dynamic vibrating-wire analyzer system:

A copy of this manual

DVWTool Dynamic Vibrating-Wire Toolbox software for CDM-VW300
support

DevConfig Device Configuration Utility software

Required datalogger operating systems
Other support information and downloads are available at
www.campbellsci.com/cdm-vw300-support .
1. Introduction
Vibrating-wire sensors are commonly used in geotechnical or structural
monitoring applications to measure strain, load, tilt, inclination, temperature,
pressure, extension, and crack movement. CDM-VW300 Series Dynamic
Vibrating-Wire Analyzers facilitate sub-second measurement of vibrating-wire
sensors. These analyzers perform advanced excitation, spectral analysis, and
digital signal processing to obtain high-accuracy measurements. Data are stored
on a Campbell Scientific datalogger, which is normally used to control the system
in field installations.
The CDM-VW300 has two modes of operation:

Laboratory mode
o
Manual operation
o
Does not require a datalogger
o
Requires a PC
o
Used in short-term evaluation
o
Real-time data and metadata are monitored with PC

Field mode
o
Automated operation
o
Requires a datalogger
o
PC used only for setup and collection of data from datalogger
o
Used in long-term monitoring applications
o
Time-series data and metadata stored in datalogger memory
Two analyzer models are available in the CDM-VW300 series:

CDM-VW300 (two channels)

CDM-VW305 (eight channels)
See Table 5-1, CDM / Datalogger Compatibility , in Section 5, Specifications , for
datalogger compatibility information.
Other than a few clearly noted exceptions, any discussion in this manual of the
CDM-VW300 also applies to the CDM-VW305.