Advantech MIC-3723, User Manual

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31 Chapter 3
Figure 3.7: Differential-load w/Ground Connections
Current Sink Connections
MIC-3723/3723R’s current loop output uses a 0 to +5 V (unipolar) volt-
age output as each channel’s driving source. Current drive circuits consist
of a power field-effect transistor (FET). The current output’s voltage bias
must be less then 50 V for accurate results. The card also provides an
in12 V power source for current loop excitation.
You can use three types of current sink connections:
1. Grounded load with a floating power supply.
2. Floating load with a grounded power supply.
3. Floating load with an in12 V power supply.
These are shown in the following illustrations.
Figure 3.8: Grounded-load w/Floating Power