Campbell Hausfeld SDM-CD16AC Manual Do Utilizador

 

 
Datalogger (see note) 

First 

12 V 

12 V on datalogger or 

Power 

 

 

external supply  

 

Second Gnd 

Gnd 

Common 

ground 

 C1 SDM-C1 

(CR3000, 

CR5000) or C1 (other 
dataloggers) 

Data 

 C2 SDM-C2 

(CR3000, 

CR5000) or C2 (other 
dataloggers) 

Clock  

 C3 SDM-C3 

(CR3000, 

CR5000) or C3 (other 
dataloggers) 

Enable 

 

On a CR7, SDMs connect to the ports at the upper right corner 
of the 700X Control Module.  On a CR9000X, SDMs connect to 
the ports on the CR9032 CPU Module, and on a CR9000, SDMs 
connect to the ports on the CR9080 PAM Module. 

If the 21X power supply is used to power the SDM-CD16AC, all low level 
analog measurements (thermocouples, pyranometers, thermopiles, etc.) must 
be made differentially.  This is a result of slight ground potentials created 
along the 21X analog terminal strip when the 12 V supply is used to power 
peripherals.  This limitation reduces the number of available analog input 
channels and may mandate an external supply for the SDM-CD16AC. 

•  The SDM-CD16AC must be installed in an enclosure that provides a 

pollution degree 2 environment (normally, only nonconductive pollution.  
However, a temporary conductivity caused by condensation may be 
expected).  All Campbell Scientific enclosures meet this requirement. 

•  Use copper conductors only. 
•  Wire Range:  30 − 14 AWG 
•  Tightening Torque: 5 − 7 in./lb. 
•  Use minimum 60/75 degree C wire. 
•  Input power must be connected to a class 2 supply only.  All Campbell 

Scientific power supplies meet the class 2 supply requirements. 

The order in which connections are made is critical.  
Always connect 12 V first, followed by ground, then Control 
Ports.