Campbell CNR4, Инструкция по эксплуатации

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Appendix D. CNF4 Heater/Ventilator
D-7
D.3 Wiring
TABLE D-1 shows the recommended datalogger wiring for using the CNR4
sensor with the CNF4 heater/ventilator while making the differential
measurement.
Beginning in May of 2016, the CNF4 design was changed from a
four-wire connection to an eight-wire connection. The electrical
specifications for the heater, ventilator, and tachometer output are
identical for the four-wire and eight-wire versions. The only
difference between them is the connector layout. The eight-wire
version has an added opto-coupler in the tachometer output, which
minimizes the voltage drop over the ground line and maximizes
the usable cable length. Depending on the datalogger that is used
with the CNR4-L and the older, four-wire version of the CNF4-L,
the tachometer output may not work for 25-m (82-ft) or 50-m
(164-ft) cables.
TABLE D-1. Datalogger Connections for Differential Measurement
with Heater/Ventilator Control
Function Wire Color CR6, CR1000, CR3000
Pyranometer Up Signal Red Differential Input (H)
Pyranometer Up Reference Blue 1 Differential Input (L)
Pyranometer Down Signal White Differential Input (H)
Pyranometer Down Reference Black 1 Differential Input (L)
Pyrgeometer Up Signal Grey Differential Input (H)
Pyrgeometer Up Reference Yellow 1 Differential Input (L)
Pyrgeometer Down Signal Brown Differential Input (H)
Pyrgeometer Down Reference Green 1 Differential Input (L)
Shield Clear
⏚
Thermistor
Thermistor Signal White Single-Ended Input
Thermistor Voltage Excitation Red Voltage Excitation (VX)
Thermistor Signal Reference Black
⏚
Shield Clear
⏚
CNF4 Heater/Ventilator
Ventilator Power Yellow SW12V
Ventilator Ground Brown G
Tachometer Output Green Pulse/control port
Tachometer Ground Grey
G or ⏚
Heater Power White SW12V
Heater Power Black SW12V
Heater Ground Red G
Heater Ground Blue G
Shield Clear
⏚
1 Jumper to ⏚ with user-supplied wire
NOTE