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A problem about ultra current measurement based on composite amplifier(AD 549)?

Question asked by sunjian036 on Aug 30, 2017
Latest reply on Sep 3, 2017 by krisf

This is a weak current measurement circuit, The first stage OP is AD 549LH, I have a doubt about this circuit,What is the effect of the resistor R3 and R5 in the circuit?

Regards,

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