Campbell Scientific CURS100 100 Ohm Current Shunt Terminal Input Module - Manual (Page 13)

CURS100 100 Ohm Current Shunt Terminal Input Module
Datalogger Transducer
I
H
L
G
Signal
Power
Battery
– +
Ground
FIGURE 4-5. 3-wire with external power
4.3 Four-Wire Transducers
A four-wire transducer has separate wires for power input and ground and for
signal output and ground. The signal ground may or may not be internally tied
to the power ground. Some transducers have completely isolated outputs.
Datalogger
H
L
G
+12 V
I
Transducer
Signal
Power
Ground
Signal Return
FIGURE 4-6. 4-wire with datalogger power
Datalogger
H
L
G
I
Transducer
Signal
Power
Ground
Signal Return
Battery
– +
FIGURE 4-7. 4-wire with external power
7