Campbell Scientific CDM-VW300 Series Dynamic Vibrating-Wire Analyzer System - Manual (Page 39)

CDM-VW300 Series Dynamic Vibrating-Wire Analyzers
Standard Deviation of Dynamic Frequency (Hz or Hz 2 ) is the standard
deviation of the Dynamic Frequency field computed on one-second data. It is
output once per second. It is computed after the
Output Format, Multiplier,
and Offset have been applied.
Resonant Amplitude (V) sets the desired amplitude of the steady-state signal
response from the sensor.
Excitation Strength (V) is the peak-to-peak amplitude of the excitation
waveform that is required to produce the desired response amplitude. An
increase in the Scan Rate corresponds to a decrease in the excitation strength
needed.
Diagnostic Bits provides information on the operation of the module and can
indicate conditions during which the data may be suspect.
The Minimum Frequency (Hz) and Maximum Frequency (Hz) are the
bounds in which the resonant frequency of the sensor is expected to fall during
its operation. Signal frequencies measured outside of this range are not
included in the spectral analysis, except as noted in Section 8.5.1.1,
Description of Diagnostic Parameters.
Graph button brings up a graphical display of the frequency output of the
sensors.
Pressing the Rainflow button and selecting a channel brings up a rainflow
histogram of the frequency output of the sensor on that channel.
7.1.3 Using DevConfig
The Device Configuration Utility (DevConfig) is a software package that
enables a PC to communicate with many Campbell Scientific products. It
communicates with the CDM-VW300 via USB to configure settings and
display the output of attached sensors. No datalogger is required. Data are
output to the main window in tabular form.
Users of the CDM-VW300 should become familiar with the function and
operation of DevConfig. Detailed information about this software can be found
in the DevConfig Help system and the LoggerNet software manual, which is
available at
www.campbellsci.com .
7.1.3.1 Ensure Connection is Active
The installation of DevConfig 2.04 or later or DVWTool 1.0 or later
automatically installs the drivers required to make a connection between the
CDM-VW300 and the PC. Do not connect a USB cable between your CDM-
VW300 and the PC until after DevConfig or DVWTool has been installed.
Before starting DevConfig, ensure that the CDM-VW300 analyzer is connected
to the PC via USB cable. After opening DevConfig, choose the CDM-VW300
port from the Communication Port dropdown list as indicated in FIGURE
7-2. Click the Connect button.
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