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About the role of Preload of LTC1733

hi

I am considering LTC1733.
I am checking the evaluation board user guide (DC454).


DC454 User Guide The Proper Measurement Equipment Setup in Figure 1 has 2Ω as a Preload connected to the input stage of the battery simulator.

What is the role of this 2Ω?

What happens if 2Ω is not connected?

Best regards

Yuya