3 voltage range, 4 integration – Campbell Scientific CR200/CR200X-series Dataloggers User Manual
Page 52
Section 4. Sensor Support
Figure 27: Voltage Measurement Accuracy (0° to 40° C)
4.2.3 Voltage Range
The CR200(X) has one analog voltage range of 0 to 2.5 volts. The resolution
for a single A/D conversion is 0.6 millivolts.
4.2.4 Integration
Integration is used to reduce the noise included in a measurement. The
CR200(X) uses a form of digital integration. It makes 10 A/D conversions and
averages them for the result returned. The A/D conversions are made every 26
microseconds.
Averaging will also reduce signal noise from the sensor such as when water
level measured with a pressure transducer is changing because of pressure
fluctuations caused by wind.
Averaging also has an effect on the resolution. The resolution seen in the
numerical result is the resolution of a single A/D conversion (0.6 mV) divided
by the number of A/D conversions (10).
40
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