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Appendix B. Example Programs

B.4 CR3000 Program for Measuring Pt-100

Temperature Sensor

This example measures the Pt-100 sensor for the body temperature of the

CNR4. This program requires four differential channels to measure the four

radiation outputs, one current excitation channel, and one differential channel

for Pt-100 measurement. The program measures the sensors every 1 second,

performs the online processing of the data, and stores the following processed

data to a data table called cnr4_data once every 60 minutes. It also stores the

raw time-series data from CNR4 to data table called cnr4_ts.

Minimum battery voltage

Sample datalogger panel temperature

Average short-wave radiation (pyranometer up)

Average short-wave radiation (pyranometer down)

Average long-wave radiation (pyrgeometer up)

Average long-wave radiation (pyrgeometer down)

Average CNR4 thermistor temperature (degrees C)

Average CNR4 thermistor temperature (Kelvin)

Average corrected long-wave radiation (pyrgeometer up)

Average corrected long-wave radiation (pyrgeometer down)

Average short-wave net radiation

Average long-wave net radiation

Average albedo

Average net radiation

TABLE B-1. Datalogger Connections for Differential Measurement with Pt-100

Function Wire Color CR3000/CR5000

Pyranometer Up Signal

Red

Differential Input (H)

Pyranometer Up Reference *Blue Differential Input (L)

Pyranometer Down Signal White Differential Input (H)

Pyranometer Down Reference *Black Differential Input (L)

Pyrgeometer Up Signal

Grey

Differential Input (H)

Pyrgeometer Up Reference *Yellow Differential Input (L)

Pyrgeometer Down Signal Brown Differential Input (H)

Pyrgeometer Down Reference *Green Differential Input (L)

Shield

Clear

PRT (Pt-100) Current Excitation Grey Current Excitation (IX)

PRT (Pt-100) Current Return Brown Current Excitation Return (IXR)

PRT (Pt-100) Signal

Green

Differential Input (H)

PRT (Pt-100) Signal Reference Yellow Differential Input (L)

Shield Clear

*Pull back wires for thermistor (white, red, and black), which are not in use, and tie

them around the TEMP cable using a cable tie or electrical tape to avoid possible

damage to the thermistor, due to electrical short circuit.

B-10

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