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How the CMO
works
3
ABOUT THE DEVELOPMENT BOARD
Current Measurement Option (CMO)
Current
measurement
option, CMO
R69
R78
This drawing shows how the Current Measurement Option works.
+9VDC -
+30VDC
Current
Measurement
Current
Measurement
Power
connector
+5V
power
controller
Option +5VDC
R69
+3.3V
power
controller
Option
R78
+3,3VDC
0.025 R
0.025 R
To measure the load current used on different power supplies, measure DC voltage
across the sense (CMO) resistor. The value of the resistor is 0.025 R ± 1%. Calculate
the current using this equation: I = E/R
where
?
?
?
I = current in Amps
E = measured voltage in Volts
R = 0.025 Ohms
56
ConnectCore 9C/Wi -9C Hardware Reference, Rev D 05/2010
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