Campbell CDM-VW300 Series Manual Pagina 17
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Valorado. / 5. Basado en revisión del cliente
CDM-VW300 Series Dynamic Vibrating-Wire Analyzers
4.6.4 Rainflow Histograms
Rainflow histograms are 3-D representations of the rainflow counting
algorithm of Matsuiski and Endo (1968). Rainflow histograms can be used to
monitor fatigue levels of structures under stress, such as components of a large-
scale transportation bridge. The histograms are calculated by the CDM-
VW300 analyzer to ease the processing burden required of the controlling
datalogger.
CRBasic Help topic for the Rainflow() instruction has more information about
rainflow histograms.
4.6.5 System Diagnostics
Several diagnostic values will help you scrutinize basic CDM-VW300
measurements. Excitation level and low / high frequency or amplitude
warnings are provided for each dynamic measurement. A standard deviation is
provided once each second.
Excitation level is bounded by setting the amplitude at which the wire in the
sensor is to be maintained. That figure is reported so that excitation levels can
be monitored. If the analyzer-sensor system experiences a low amplitude, high
amplitude, low-frequency, or high frequency condition, that information is also
provided.
Once each second, a standard deviation of a dynamic measurement is provided.
Unexplained changes in the standard deviation from baseline levels may
indicate noise or other interference.
5. Specifications
5.1 Features
• Measurement of standard, single-coil circuit, vibrating-wire sensors
• Dynamic-sampling rates of 20 to 333.3 Hz
• On-board frequency-output conversion
• Two (CDM-VW300) or eight (CDM-VW305), simultaneously-sampled
channels per module
• Time synchronization of multiple modules using one datalogger
• Thermistor input for each vibrating-wire channel measured at 1 Hz
• On-board temperature conversion
• Rainflow-histogram compilation
• Superior noise immunity and effective measurement resolution (precision)
• Continuous resonant vibration in the sensor
• Spectral analysis method protected under U.S. patent no. 7,779,690. An
additional U.S. patent that relates to the dynamic vibrating-wire
measurement technique is pending.
7
- CDM-VW300 Series 1
- Dynamic Vibrating-Wire 1
- Analyzers 1
- Warranty 3
- Assistance 4
- Table of Contents 5
- Figures 8
- Wire Analyzers 11
- 2. Cautionary Statements 12
- 3. Initial Inspection 12
- 4. Overview 13
- 4.2 Measurement Rates 14
- 4.4 Laboratory Mode 15
- 4.5 Field Mode 15
- 4.6 Data Uses 16
- 5. Specifications 17
- 5.2 Specifications 18
- 6. Installation 20
- 6.2 Field-Mode Installation 28
- Offset 29
- CDM_VW300Config() 34
- CDM_VW300Dynamic() 34
- CDM_VW300Static() 34
- 7. System Operation 36
- 7.1.2 Using DVWTool 37
- fields 38
- 7.1.3 Using DevConfig 39
- 7.2 Using the Datalogger 40
- 7.4 Using Power Supplies 41
- 7.5.1 Device Name 44
- 7.5.2 CPI Bus Speed 44
- ) allow 46
- 7.6 Sensor Selection 47
- 7.7 System Connections 47
- Shield / Sensor Ground 48
- Vibrating-Wire Sensor 48
- 7.8 Operating System 56
- 7.9 Power-Up Sequence 56
- 7.10 CRBasic Programming 57
- RF7, RF8) 58
- CPISpeed(BitRate) 58
- 7.11 System Adjustments 59
- 7.12 System Validation 59
- 8. Troubleshooting 63
- 8.4 Filtering Harmonics 64
- 8.5 Diagnostic Outputs 64
- (DiagCode AND 256) 67
- (DiagCode AND 512) 68
- (DiagCode AND 1024) 68
- (DiagCode AND 2048) 68
- 8.6 Factory Default Reset 69
- 9. Glossary 70
- Interface 75
- B.4 Specifications 77
- C.1.1 Power 79
- C.1.2 Interconnect Cable 79
- C.2 Distributed Architecture 81
- Thermistor 84
- 52611099 87
- F.2 Accuracy and Resolution 89
- G.1 Dynamic Measurements 93
- Channels 100
- output frequency 102
- Channels, Rainflow Histogram 104
- reading to obtain 109
- G.2 Static Measurements 117
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