National Instruments USB-6525 - Page 13

USB-6525 User Guide and Specifications 12 ni.com
Figures 8 and 9 show examples of using an external flyback diode to
protect DC inductive loads and an MOV to protect AC inductive loads,
respectively.
Figure 8. Contact Protection for DC Inductive Loads
Figure 9. Contact Protection for AC Inductive Loads
Inductive
Load
USB-6525
Flyback Diode for
DC Inductive Loads
V
DC
+
–
P0.x A
P0.x B
Inductive
Load
USB-6525
MOV for AC
Inductive Loads
V
AC
P0.xA
P0.xB