Teledyne LeCroy QPHY-SAS2 - Manual (Page 37)

QPHY-SAS2 Software Option
917718 Rev A
37

F1 is the differential input waveform. This is calculated by subtracting the negative input waveform from the
positive input waveform.

F2 is the resampled and interpolated waveform that has exactly 16 evenly spaced samples per UI. This
waveform is also averaged to reduce Rj. This is all done in accordance with the specification. This
waveform is saved in the required input format for the SASWDP script. This file is saved in the
D:\Waveforms\SAS2 directory on the oscilloscope.
Figure 33 - WDP Results
In the measure section:

WDP (P1) is the value that was entered in the WDP dialog box. This should be the value that was the output
from the SASWDP script. This is the measured value for Tx-WDP (5.3.9). This value must be less than
13 dB in order to pass this test.

Patt Length (P3) is an output of the pattern length of the input waveform. This can be used to ensure that a
patten of the appropriate length was sent from the device under test.