Home » Campbell Scientific Manuals » Electronics Accessories » Campbell Scientific Vibrating » Manual Viewer

Campbell Scientific Vibrating CRVW3 3-Channel Vibrating-Wire Datalogger - Page 33

Channel, Options, Spectrum, Undo Zoom, Time Series, Peak Frequency, Signal-to-Noise Ratio, Decay

View all Campbell Scientific Vibrating manuals

Add to My Manuals
Save this manual to your list of manuals

Page 33 highlights

CRVW3 3-Channel Vibrating-Wire Datalogger To ensure proper operation of the CRVW3, you should confirm that the RecordNo field of the VW_Data table is incrementing at the proper measurement interval, and that the measurement data (frequency, temperature) is correct. The Time Stamp field should also get updated as each measurement is made. By confirming this operation in the lab, you have the opportunity to resolve any problems as early as possible and in an environment more favorable for troubleshooting. The Troubleshoot tab is provided so you can see detailed information about the vibrating-wire sensor measurements made by the CRVW3. You can manually trigger a measurement test and see diagnostic results within a few seconds. Select your channel of interest in the Channel selection box. Use the Options button to set the sweep excitation and frequency filtering window, and also to set the excitation voltage level to be used during the test. Press the Poll button to initiate the test. Within a few seconds the results will be displayed on the screen. The Spectrum window shows the frequency domain response of the vibratingwire sensor. Peaks in the spectrum indicate the main frequencies at which the sensor's wire vibrated during the measurement. The strength of the peaks are shown in the millivolt scale. Drag a rectangle on the viewing area to zoom in. Press the Undo Zoom button to return to the initial scale. The Time Series window shows the motion of the sensor's wire (in millivolts) during the measurement period as given by the changing magnetic field sensed by the coil circuitry. Drag a rectangle on the viewing area to zoom in. Press the Undo Zoom button to return to the initial scale. The main frequency reading is given in the Peak Frequency box in units of Hertz (Hz). Other diagnostic readings are given to help assess the quality of the reading: • Signal-to-Noise Ratio: The amplitude (mV) of the strongest frequency peak in the spectrum divided by the amplitude (mV) of the 2nd strongest frequency peak. • Decay (Decay Ratio): The amplitude (mV) of the time-series motion of the wire at the beginning of the measurement divided by the amplitude (mV) of the wire motion at the end of the measurement. This can also be approximately discerned by a study of the results in the Time Series window. • Peak Amplitude: The amplitude in millivolts (mV) of the strongest frequency peak in the spectrum. • Noise Frequency: The frequency (Hz) of the 2nd strongest frequency peak in the spectrum. • Thermistor: The measurement of the thermistor's electrical resistance in units of Ohms. 23

Section	Page
Revision and Copyright Information	1
Limited Warranty	3
Assistance	4
Precautions	5
Table of Contents	7
1. Introduction	11
2. Cautionary Statements	12
3. Initial Inspection	13
4. Quickstart	14
5. Overview	15
5.1 Measurement Theory	15
5.2 About This Manual	17
6. Specifications	18
7. Installation	19
7.1 Individual Devices and Radio Considerations	20
7.2 Software Requirements	20
8. Installation of Individual CRVW3 Stations	20
8.1 Lab Connection and Configuration	21
8.1.1 Preparing the Windows Computer (PC)	21
8.1.1.1 Device Configuration Utility (DevConfig)	21
8.1.1.2 Install the CRVW3 USB Driver	22
8.1.1.3 Network Planner	22
8.1.2 Wiring Temporary Sensors to the CRVW3	23
8.1.3 Providing Temporary Power to the CRVW3	25
8.1.4 Connecting to the CRVW3	25
8.1.5 Configuring the CRVW3	28
8.1.5.1 Key Settings	28
8.1.5.2 Managing Changes to Settings	31
8.1.6 Testing the Measurement Operation of the CRVW3	32
8.1.7 Validating Radio Connectivity in the Lab	34
8.1.7.1 Configuring the RF450 Radio	35
8.1.7.2 Configuring the CRVW3-RF451	35
8.1.7.3 Using DevConfig to Connect to the CRVW3-RF451 Over the Radio	36
8.2 Field Deployment of the CRVW3	36
8.2.1 Connecting Sensors to the CRVW3	37
8.2.2 Providing Power to the CRVW3	39
8.2.2.1 Alkaline D-Cell Option (–ALK)	39
8.2.2.2 Rechargeable Battery Option (–RC)	41
8.2.2.3 Grid Power	42
8.2.3 Humidity Monitoring and Control	43
8.2.4 Mounting the CRVW3 Enclosure	43
8.2.5 Installing the CRVW3 Antenna	44
8.2.6 Connecting the CRVW3 Electrical System to Earth Ground	45
8.2.7 Validating and Fine-Tuning CRVW3 Settings	45
8.2.8 Confirming CRVW3 Sensor Measurement Operation	46
8.2.8.1 LED Operation	46
8.2.8.2 Validation with DevConfig	48
8.2.9 Validating CRVW3 Radio Operation	50
8.2.10 Sealing the CRVW3 Enclosure	50
8.3 On-site Manual Data Collection	51
9. Radio Networks	51
9.1 Simple Radio Network Definition	52
9.2 Simple Network Installation Overview	53
9.3 CRVW3-RF451 Simple Network Installation	53
9.3.1 Deploying CRVW3 End-node Stations, Confirming Radio Connectivity	54
9.3.2 Base Station Installation and Validation	54
9.3.3 Configuring LoggerNet for Connectivity and Scheduled Collection	55
10. Complex (Large) Radio Networks	56
10.1 Radio Network Station Types	56
10.1.1 LoggerNet Computer Station	56
10.1.2 Base Radio Station	57
10.1.3 CRVW3 End-node Station	58
10.1.4 CRVW3 Repeater Station	58
10.1.5 Dedicated Repeater Station	58
10.1.6 Aggregating Datalogger Station	59
10.2 Planning the Radio Network	59
10.2.1 Sensor Planning	61
10.2.2 Planning for CRVW3 End-node Stations	62
10.2.3 Repeater Planning	63
10.2.4 LoggerNet Station Planning	63
10.2.5 Planning the Base Station	64
10.2.6 Planning RF451 Radio Networks	65
10.2.6.1 Base Station Design for RF451 Radio Networks	66
10.2.7 Plan Validation and Hardware Procurement	67
10.2.7.1 Pre-procurement Field Visits	67
10.2.7.2 Plan Validation with Others	68
10.2.7.3 Hardware Procurement	68
10.3 Deployment Strategy	68
10.3.1 Radio Network Lab Validation	68
10.3.2 Field Deployment Considerations	69
10.4 Deployment of CRVW3 Radio Stations	70
10.4.1 CRVW3-RF451 Deployment	70
10.5 Base Station Deployment	71
10.5.1 Base Station on the RF451 Network	72
10.6 Repeater Station Deployment	73
10.6.1 Repeaters on RF451 Networks	73
10.7 LoggerNet Configuration	74
10.7.1 Physical Connection to the Base Station	74
10.7.2 Configuring the Network Map of LoggerNet	74
10.7.3 Connecting to CRVW3 Stations	79
10.7.4 Setting up Automatic Data Collection	81
11. Operation of CRVW3 Networks	81
11.1 Monitoring Automatic Data Collection	82
11.2 Manual Data Collection	84
11.2.1 Manual Data Collection From the LoggerNet Station	84
11.2.2 Manual Data Collection at the CRVW3 Site	85
11.3 Station Health Monitoring	86
11.4 Processing Collected Data	87
11.4.1 Monitoring Data Influx Using Real-time Displays	87
11.4.2 Analyzing and Publishing Historical Data	87
12. Maintenance of CRVW3 Networks	89
12.1 CRVW3 Maintenance with LoggerNet	89
12.1.1 Battery Monitoring	89
12.1.2 Sensor Spectrum Checks	90
12.1.3 Adjusting Device Settings	92
12.2 CRVW3 On-site Maintenance Visits	93
13. Troubleshooting CRVW3 Networks	94
13.1 Troubleshooting Problems Remotely Using LoggerNet	95
13.2 Troubleshooting Problems by Visiting the CRVW3 Site	95
Appendix A. Updating CRVW3 Firmware	97
Appendix B. Terminal Mode from Connect Screen or DevConfig	101
Appendix C. Aggregating Dataloggers	103
C.1 Aggregator Station Configuration	103
C.2 Programming the Aggregator	104
Appendix D. GetDataRecord Sample Program	105
Appendix E. Engineering Output and Calibration	107
E.1 Engineering Output	107
E.2 Calibration of Sensors	108

Match case Limit results 1 per page

CRVW3 3-Channel Vibrating-Wire Datalogger

To ensure proper operation of the CRVW3, you should confirm that the

RecordNo

field of the

VW_Data

table is incrementing at the proper

measurement interval, and that the measurement data (frequency, temperature)

is correct. The

Time Stamp

field should also get updated as each

measurement is made. By confirming this operation in the lab, you have the

opportunity to resolve any problems as early as possible and in an environment

more favorable for troubleshooting.

The

Troubleshoot

tab is provided so you can see detailed information about

the vibrating-wire sensor measurements made by the CRVW3. You can

manually trigger a measurement test and see diagnostic results within a few

seconds. Select your channel of interest in the

Channel

selection box. Use the

Options

button to set the sweep excitation and frequency filtering window, and

also to set the excitation voltage level to be used during the test. Press the

Poll

button to initiate the test. Within a few seconds the results will be displayed on

the screen.

The

Spectrum

window shows the frequency domain response of the vibrating-

wire sensor. Peaks in the spectrum indicate the main frequencies at which the

sensor’s wire vibrated during the measurement. The strength of the peaks are

shown in the millivolt scale. Drag a rectangle on the viewing area to zoom in.

Press the

Undo Zoom

button to return to the initial scale.

The

Time Series

window shows the motion of the sensor’s wire (in millivolts)

during the measurement period as given by the changing magnetic field sensed

by the coil circuitry. Drag a rectangle on the viewing area to zoom in. Press

the

Undo Zoom

button to return to the initial scale.

The main frequency reading is given in the

Peak Frequency

box in units of

Hertz (Hz). Other diagnostic readings are given to help assess the quality of

the reading:

•

Signal-to-Noise Ratio

: The amplitude (mV) of the strongest

frequency peak in the spectrum divided by the amplitude (mV) of the

strongest frequency peak.

•

Decay

(Decay Ratio): The amplitude (mV) of the time-series motion

of the wire at the beginning of the measurement divided by the

amplitude (mV) of the wire motion at the end of the measurement.

This can also be approximately discerned by a study of the results in

the

Time Series

window.

•

Peak Amplitude

: The amplitude in millivolts (mV) of the strongest

frequency peak in the spectrum.

•

Noise Frequency

: The frequency (Hz) of the 2

strongest frequency

peak in the spectrum.

•

Thermistor

: The measurement of the thermistor’s electrical resistance

in units of Ohms.