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## Main Question or Discussion Point

Hi,

Suppose I have an amplifier with feedback, how would I measure the input and output resistances (using instruments)?

If the input of the amplifier is a voltage source, the input resistance would simply be V(signal) / I(signal).

Now if the output of the amplifier is a current, would I just need to hook a load resistance and measure the voltage across and then divide by the output current?

Lastly, is it possible to measure beta (the feedback gain), or does that have to be done mathematically?

Many Thanks

Suppose I have an amplifier with feedback, how would I measure the input and output resistances (using instruments)?

If the input of the amplifier is a voltage source, the input resistance would simply be V(signal) / I(signal).

Now if the output of the amplifier is a current, would I just need to hook a load resistance and measure the voltage across and then divide by the output current?

Lastly, is it possible to measure beta (the feedback gain), or does that have to be done mathematically?

Many Thanks