Campbell Scientific Vibrating CRVW3 3-Channel Vibrating-Wire Datalogger - Page 49

Peak Frequency, Thermistor, Options, Save Last Results, Export, Signal-to-Noise Ratio, Channel1

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CRVW3 3-Channel Vibrating-Wire Datalogger Check the Peak Frequency to ensure that the main sensor reading is in the expected range. A Signal-to-Noise Ratio of 6 or greater is preferred. Check the Thermistor value (in units of Ohms) if used. If multiple peaks occur in the response spectrum of the sensor, be sure to choose the Begin Frequency and End Frequency carefully to eliminate unwanted signals, yet still allow for variation of the sensor output frequency due to changes in the measured phenomenon. The grey shading in the Spectrum display indicates how the beginning and ending frequencies are set. Use the Options button to temporarily experiment with different frequency window ranges. Use the Channel1, Channel2, and Channel3 tabs (under the Settings Editor tab) to make permanent changes to the Begin Frequency and End Frequency settings. You can use the Save Last Results or Export buttons to save the test information shown on the screen into a file. These saved results can be stored and used as a historical reference (baseline or datum point) for comparison with the same sensor's behavior in the future. The saved results can also be sent to others (including Campbell Scientific support personnel) for evaluation and troubleshooting purposes. Use the Off Line Analysis tab of DevConfig (shown when disconnected from the CRVW3) to open and view a file saved previously with the Save Last Results button. Refer to Section 8.1.6, Testing the Measurement Operation of the CRVW3, for more information about the operation of the Troubleshoot tab screen. Use the Data Monitor tab in DevConfig to view frequency and temperature data in both the Public table and the VW_Data table. The VW_Data table is the final storage table used to persist measurements made by the CRVW3. You should confirm that the data in the VW_Data table is updating immediately after each measurement is made by the device. Refer to Section 8.1.6, Testing the Measurement Operation of the CRVW3, for more information about using the Data Monitor tab. 39

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CRVW3 3-Channel Vibrating-Wire Datalogger
Check the
Peak Frequency
to ensure that the main sensor reading is in the
expected range. A
Signal-to-Noise Ratio
of 6 or greater is preferred. Check
the
Thermistor
value (in units of Ohms) if used.
If multiple peaks occur in the response spectrum of the sensor, be sure to
choose the
Begin Frequency
and
End Frequency
carefully to eliminate
unwanted signals, yet still allow for variation of the sensor output frequency
due to changes in the measured phenomenon. The grey shading in the
Spectrum display indicates how the beginning and ending frequencies are set.
Use the
Options
button to temporarily experiment with different frequency
window ranges. Use the
Channel1
,
Channel2
, and
Channel3
tabs (under the
Settings Editor
tab) to make permanent changes to the
Begin Frequency
and
End Frequency
settings.
You can use the
Save Last Results
or
Export
buttons to save the test
information shown on the screen into a file. These saved results can be stored
and used as a historical reference (baseline or datum point) for comparison
with the same sensor’s behavior in the future. The saved results can also be
sent to others (including Campbell Scientific support personnel) for evaluation
and troubleshooting purposes. Use the
Off Line Analysis
tab of
DevConfig
(shown when disconnected from the CRVW3) to open and view a file saved
previously with the
Save Last Results
button. Refer to Section 8.1.6,
Testing
the Measurement Operation of the CRVW3
, for more information about the
operation of the
Troubleshoot
tab screen.
Use the
Data Monitor
tab in
DevConfig
to view frequency and temperature
data in both the
Public
table and the
VW_Data
table. The
VW_Data
table is the
final storage table used to persist measurements made by the CRVW3. You
should confirm that the data in the
VW_Data
table is updating immediately
after each measurement is made by the device. Refer to Section 8.1.6,
Testing
the Measurement Operation of the CRVW3
, for more information about using
the
Data Monitor
tab.
39