Campbell Scientific CDM-VW300 Series Dynamic Vibrating-Wire Analyzer System - Manual (Page 7)

Table of Contents
8.5.1 Diagnostic Codes (Dynamic) ......................................................54
8.5.1.1 Description of Diagnostic Parameters ..............................55
8.5.1.2 Calculating Low- and High-Frequency Boundaries .........56
8.5.1.3 Using Diagnostic Parameters ...........................................57
8.5.1.4 Decoding the Diagnostic Code.........................................57
8.5.1.4.1 Excitation Strength ................................................57
8.5.1.4.2 Low-Amplitude Warning Flag ..............................57
8.5.1.4.3 High-Amplitude Warning Flag..............................58
8.5.1.4.4 Low-Frequency Warning Flag...............................58
8.5.1.4.5 High-Frequency Warning Flag ..............................58
8.5.1.4.6 Interpreting the Diagnostic Code...........................58
8.5.2 Standard Deviation of Dynamic Output......................................59
8.6 Factory Default Reset.........................................................................59
9. Glossary ....................................................................60
10. References and Attributions....................................60
Appendices
A. Measurement Theory.............................................. A-1
A.1 Dynamic Vibrating-Wire Measurements ........................................ A-1
A.1.1 Dynamic and Static Frequencies.............................................. A-2
B. SC-CPI Datalogger to CPI Interface....................... B-1
B.1 Introduction......................................................................................B-1
B.2 Quickstart.........................................................................................B-1
B.3 Overview..........................................................................................B-1
B.4 Specifications ...................................................................................B-3
C. CDM Devices and CPI Bus ..................................... C-1
C.1 CDM Interconnection and Datalogger Connection..........................C-1
C.1.1 Power ........................................................................................C-1
C.1.2 Interconnect Cable ....................................................................C-1
C.1.3 Speed as a Function of Distance ...............................................C-2
C.1.4 CPI Grounding ..........................................................................C-3
C.1.6 Addressing ................................................................................C-3
C.2 Distributed Architecture...................................................................C-3
D. Digits Conversion ................................................... D-1
D.1 Example: Frequency to Digits to Displacement.............................. D-1
E. Calculating Measurement Error............................. E-1
E.1 Example Error Calculation: Geokon Strain Gage ............................E-1
E.2 Example Error Calculation: DGSI Embedment Strain Gage ...........E-2
E.3 Example Error Calculation: DGSI Spot-Welded Strain Gage..........E-2
E.4 Example Error Calculation: Geokon 4420 Crack Meter ..................E-2
E.5 Example Error Calculation: DGSI Piezometer 52611099................E-3
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