Campbell Scientific CDM-VW300 Series Dynamic Vibrating-Wire Analyzer System - Manual (Page 38)

CDM-VW300 Series Dynamic Vibrating-Wire Analyzers
FIGURE 7-1. DVWTool Settings Editor and Data Display
If CDM-VW300 does not appear in the available selections for
Com Port, there is a problem with the installation of the device
driver or the creation of the COM port. See Section 7.1.1,
Software and Driver Installation, for remedial steps. NOTE
7.1.2.2 DVWTool Settings Editor
See TABLE 7-1, Summary of CDM-VW300 Configuration Settings, for a
listing of settings that can be viewed and edited with DVWTool.
7.1.2.3 Button and Field Descriptions
Enable — select each checkbox to turn on the respective channel.
Dynamic Frequency is the resonant frequency of the vibrating-wire sensor
sampled at the specified scan rate. This is the primary output of the attached
analyzer. If the Output Format field is set to Freq then this field represents
the resonant frequency of the vibrating-wire sensor. If the Output Format
field is set to Freq
2 , this is the square of the resonant frequency. In either
format, the resulting number is modified by the Multiplier and Offset fields
before being output to this field.
Static Frequency (Hz or Hz 2 ) represents the same information as the
Dynamic Frequency field in all respects except for the slower rate at which it
is computed.
Static Thermistor (ohms) is a measure of the resistance across the thermistor
inputs. It is measured once per second. If the Steinhart-Hart Thermistor
Coefficients (A, B, and C) are entered for the channel, then they are used to
convert the measured resistance to degrees Celsius.
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