I found an application note describing how the E5061B can be used to measure the loop gain of DCDC converter.
But I only have access to a E5071C.
The E5061B is a much better choice to measure the loop gain of the DC/DC converter due to its additional high impedance inputs and low frequency range.
You may be able to use your E5071C depending on your DUT requirements. Here are a few things to keep in mind:
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