问题：
Why is the cable used in the HDMI Sink minimum differential sensitivity test?
答案：
In the Sink minimum differential sensitivity measurement set up diagram, a cable is used for connecting the HDMI-TPA-R-TDR and DUT. This is not mandatory. You can connect the TPA-P-TDR test fixture instead of the TPA-R-TDR and connect the TPA-P-TDR directly to the DUT. For some sink device the accessibility of the HDMI port using the TPA-P-TDR is not possible, in those cases you can use the cable to connect the TPA-R-TDR and DUT. However, at the end of the measurement you need to measure the differential voltage at the DUT end.
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