Campbell Scientific CDM-VW300 Series Dynamic Vibrating-Wire Analyzer System - Manual (Page 15)

CDM-VW300 Series Dynamic Vibrating-Wire Analyzers
Vibrating Wire
Thermistor
Stainless Steel Housing
4-Conductor Cable
Filter Plucking and Pickup Coils
Diaphragm Internal Bulkhead Seal
Two Coil Outputs
Two Thermistor
Outputs
FIGURE 4-4. Single-coil vibrating-wire sensor including coil and
thermistor outputs
4.4 Laboratory Mode
Laboratory mode allows for examination and validation of specific
measurements types without a datalogger, such as might occur before field
deployment. As shown in FIGURE 4-5, a connection is made from the CDM-
VW300 to a personal computer using a USB cable. Campbell Scientific
DVWTool software on the PC enables observation of sensor outputs and
configuration of the CDM-VW300 to measure sensors. Specific procedures
can be found in Section 6.1.2, Laboratory-Mode Installation Procedure.
Vibrating-Wire
Sensors
CDM-
VW300
PC
DVWTool
FIGURE 4-5. Laboratory-mode measurement system diagram
4.5 Field Mode
Field mode is used for long-term measurement and data acquisition. As shown
in FIGURE 4-6, a connection is made from the CDM-VW300 to a Campbell
Scientific datalogger through the SC-CPI interface. A Campbell Scientific
datalogger with a customized CRBasic program configures, controls, and
collects data from the CDM-VW300. Specific installation procedures are
found in Section 6.2.2, Field-Mode Installation Procedure.
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