Decagon Devices EC-5, Руководство пользователя

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EC-5 User’s Manual
4. Collecting Data
9
4. Collecting Data
Data Logger Requirements
The EC-5 sensor is designed to work most efficiently
with Decagon’s 5-channel Em5b, Em50, or ProCheck
handheld readout. All Decagon readout devices use a
3.0V excitation.
The sensors however, may be adapted for use with other
data loggers, such as those from Campbell Scientific,
Inc., for example. The EC-5 requires an excitation volt-
age in the range of 2 to 3.6 volts. The sensors produce
an output voltage that depends on the dielectric constant
of the medium surrounding the sensor, and ranges
between 10 and 50% of the excitation voltage. Any data
logger which can produce a 2.5 to 3.6V excitation with
approximately 10 millisecond duration and read a volt-
level signal with 12-bit or better resolution should be
compatible with the EC-5 sensor. The current require-
ment for the EC-5 is 10mA at 2.5V.
NOTE: EC-5 sensors are intended only for use with
data loggers and readout devices which can provide
short excitation pulses, leaving the sensors turned off
most of the time. Continuous excitation not only wastes
battery power, but may, under certain circumstances,
cause the sensor to exceed government specified limits
on electromagnetic emissions. Do not continuously
power the EC-5 sensor.