Teledyne LeCroy QPHY-USB3-Tx-Rx - Manual (Page 43)

QPHY-USB3-Tx-Rx Software Option
917719 Rev A
43
MANUAL CALIBRATION PROCEDURES
Cable Deskewing using the Fast Edge Output (WavePro 7 Zi and WaveMaster 8Zi only)
The following procedure demonstrates how to manually deskew two oscilloscope channels and cables using the
fast edge out put, with no need for any T connector or adapters.
This can be done once the temperature of the oscilloscope is stable. The oscilloscope must be warmed up for at
least a half-hour before proceeding. This proc edure sho uld be run again if the temperature of the oscilloscope
changes by more than a few degrees.
For the purpose of this procedure, the two channels being deskewed are referred to as Channel X and Channel
Y. The reference channel is Channel X and the channel being deskewed is Channel Y.
1. Begin by rec alling the Default Oscilloscope Setup
2. Configure the oscilloscope as follows:

Timebase
i. Fixed Sample Rate
ii. Set the Sample Rate to 40 GS/s
iii. Set the Time/Division to 1 ns/div
Figure 32 - Timebase Settings for Deskew with the Fast Edge Output

Channels
i. Turn on Channel X and Channel Y.
ii. Set V/div for Channel X and Channel Y to 100mV/div.
iii. Set the A veraging of Channel X and Channel Y to 500 sweeps .
iv. Set the Interpolation of Channel X and Channel Y to Sinx/x.
Figure 33 - Channel Pre-Processing Settings for Deskew with the Fast Edge Output

Trigger
i. Configure to Source to be Fa stEdge.
ii. Set the Slope to Positive.