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How i can i give differential output from sbrio

i want to connect relay at the output of the sbRIO for switching 

i gave a  (0-7) voltage for 5volt relay from ANALOG OUT and ANALOG OUT GROUND

but relay is not switching  

 

i tried with a mobile battery  3.7volt it is switching and i found it happened  when i connected -ve and +ve terminals of the battery with the relay

 

 

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Which sbRIO model do you have?

How much current does the relay draw?

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i am using sbRIO model number  9642

 

i have relays  of 12 volt (current 0.0375A) and 5 volt( current 0.072 A)..

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