VW Jointmeter, 2006/6/15 8
Taking Readings
Test Readings •You should take readings before the sensors are installed to
check that they are working properly. Use the sensor calibra-
tion sheets to convert frequency readings to units of length.
•You should also take readings immediately after sensors are
installed to check that they are still working.
Initial Readings •You should take a set of initial readings to serve as the base-
line readings. All subsequent readings will be compared to the
baseline readings, so these initial readings are especially
important.
•Note the time, temperature, weather conditions. These should
be as close to typical as possible.
•If the sensors are underwater, allow at least four hours for full
temperature equilibrium.
•If the sensors are not in water, take some measures to prevent
heating by the direct sunlight. Then, when the sensors have
cooled to the ambient air temperature, obtain the initial read-
ings.
Using Portable Readouts These instructions tell how to read Vibrating Wire (VW) sensors
with Slope Indicator’s portable readouts. Instructions for read-
ing VW sensors with a Campbell Scientific loggers can be found
in the support - technotes section of at www.slopeindicator.com.
Reading with the
VW Data Recorder
1. Connect signal cable to the data recorder:
2. Choose Hz + Thermistor.
3. Select the 1400-3500 Hz range.
4. The recorder displays sensor reading in Hz and a temperature
reading in degrees C.
Binding Posts Wire Colors
VW Orange Red
VW White & Orange Black
TEMP Blue White
TEMP White & Blue Green
SHIELD Shield Shield
