Campbell CNR4, Руководство пользователя

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CNR4 Net Radiometer
16
Table 6-1. Datalogger Connections for Differential Measurement
Function Wire Colour CR1000 CR3000/CR5000
Pyranometer Up Signal Red Differential Input (H) Differential Input (H)
Pyranometer Up Reference *Blue Differential Input (L) Differential Input (L)
Pyranometer Down Signal White Differential Input (H) Differential Input (H)
Pyranometer Down Reference *Black Differential Input (L) Differential Input (L)
Pyrgeometer Up Signal Grey Differential Input (H) Differential Input (H)
Pyrgeometer Up Reference *Yellow Differential Input (L) Differential Input (L)
Pyrgeometer Down Signal Brown Differential Input (H) Differential Input (H)
Pyrgeometer Down Reference *Green Differential Input (L) Differential Input (L)
Shield Clear
Thermistor Signal White Single-ended Input Single-ended Input
Thermistor Voltage Excitation Red Voltage Excitation (EX) Voltage Excitation (VX)
Thermistor Signal Reference Black
Shield Clear
*Jumper to with user supplied wire.
Table 6-2. Datalogger Connections for Single-ended Measurement
Function Wire Colour CR1000 CR3000/CR5000
Pyranometer Up Signal Red Single-Ended Input Single-Ended Input
Pyranometer Up Reference Blue
Pyranometer Down Signal White Single-Ended Input Single-Ended Input
Pyranometer Down Reference Black
Pyrgeometer Up Signal Grey Single-Ended Input Single-Ended Input
Pyrgeometer Up Reference Yellow
Pyrgeometer Down Signal Brown Single-Ended Input Single-Ended Input
Pyrgeometer Down Reference Green
Shield Clear
Thermistor Signal White Single-ended Input Single-ended Input
Thermistor Voltage Excitation Red Voltage Excitation (EX) Voltage Excitation (VX)
Thermistor Signal Reference Black
Shield Clear
7. Datalogger Programming
The CNR4 outputs four voltages that typically range from 0 to 15 mV for the
pyranometers, and
±
5 mV for the pyrgeometers. A differential voltage
measurement is recommended because it has better noise rejection than a single-
ended measurement. If differential channels are not available, single-ended
measurements can be used. The acceptability of a single-ended measurement can
be determined by simply comparing the results of single-ended and differential
measurements made under the same conditions.
Additionally, one voltage excitation channel and a single-ended analogue channel
are required to make the temperature measurement, using the thermistor.