How to measure the open loop response in CFA?

Disabled Account
Joined 2015
I noticed the habitual way on this website to measure the open loop response, is to insert an AC generator in series with the feedback. Dadod uses also a current generator in parallel along the series voltage. In this thread Apex A40 fundamental improvement. (Sandy) , I asked to separate the output ac component , but I was advised to read Bob Cordell's book. Now, I did consult the evangil of saint Bob, and I found he prescribes on page 88 exactly the same what I think it should .
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What is the story of series generator in the feedback loop?
 

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