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confusion over AD620

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raviram87

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On working with AD620 instrumentation amplifier, i found that pin number 5 has been designated as REFERENCE...

what is this mean? wat should ideally be supplied to this pin?
i supplied two input signals of the same amplitude and frequency to the 2 inputs of the AD620... i was getting an amplified output... i should be getting almost zero output rite???

i am not able to understand why this is happeneing... can u ppl help me...
 
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