Measurement Computing Data Translation DT3034, User Manual

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Wiring Signals
49
Connecting Current Loop Inputs
Figure 9 shows how to connect a current loop input to the DT740 screw terminal panel.
Figure 9: Connecting Current Inputs to the DT740 (Shown for Channel 0)
DT740 Panel
TB1
Analog Input 0
Analog Input 0
Return
TB2
+
-
TB50
Analog Shield
Use current shunt resistor R17 to convert current
to voltage; 250

for 4 to 20 mA = 1 to 5 V. The
common side of the external loop supply must
either connect to analog ground or, if needed, to a
bias return resistor (R1 in this case).
4 to 20 mA
+V
CC
R1
R17
TB51
Analog Ground