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CNR1 Net Radiometer

comparing the results of single-ended and differential measurements made

under the same conditions.

For the CR3000 and CR5000, one differential channel and a current excitation

channel are required to measure the PT-100.

For the other dataloggers, two differential channels and the 4WPB100 module

are required to measure the Pt-100 temperature sensor.

The 4WPB100 is included with the CNR1 sensor purchased from

CSI.

NOTE

FIGURE 6-1. 4WPB100 Module

6.1 Calibration Factor

Each CNR1 is provided with a ‘Certificate of Calibration’ by the manufacturer

that shows the sensor serial number and ‘sensitivity’, or calibration factor. The

serial number and sensitivity are also shown on a label attached to the sensor.

The calibration factor is in units of uV/(W m

-2

), which needs to be converted to

units of (W m

-2

)/mV for the multiplier parameter in the datalogger program.

To convert the units, divide the calibration factor into 1000. For example, if

the calibration factor is 7.30 uV/(W m

-2

), the multiplier is 1000/7.3 = 136.99

(W m

-2

)/mV.

6.2 Example Programs

6.2.1 Example 1, CR23X Program Using Differential Channels

Program Example 1 requires six differential channels and the 4WPB100

module to measure the four radiation outputs and the Pt-100 temperature

sensor. The program measures the sensors every 2 seconds and calculates and

stores the following data to final storage every 60 minutes:

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 31 32

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Campbell CNR1 Spezifikationen Seite 15