Teledyne LeCroy QPHY-SAS3 - Manual (Page 34)

The following figure from the SAS-3 specification provides a definition for the Rpre, Rpost, VMA, and
VHL. In each test each of these voltage levels are labeled on the oscilloscope display.
Figure 28 – Definition of Rpre, Rpost, VMA, and VHL
• Rpre is defined as V3/V2.
• Rpost is defined as V1/V2.
• VMA is defined as V2-V5.
• VHL is defined as the peak to peak voltage on the alternating bit portion of the waveforms.
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