Teledyne LeCroy QPHY-SAS2 - Manual (Page 40)

40
917718 Rev A
CALIBRATION PROCEDURES
Cable Deskewing using the Fast Edge Output (WavePro 7 Zi and WaveMaster 8Zi only)
The following procedure demonstrates how to deskew two oscillo scope channels and cables using the fast edge
output, with no need for any “T” connector or adapters.
This can be done once the temperature of the oscilloscope is stable. The
oscillo scope must be warmed up for at
least a half-hour before proceeding. This procedure should 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 will be referred to as Channel X and
Channel Y. The reference channel will be Channel X and the channel being deskewed will be Channel Y.
1. Begin by recalling 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 35 - 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 Averaging of Channel X and Channel Y to 500 sweeps
iv. Set the Interpolation of Channel X and Channel Y to Sinx/x
Figure 36 - Channel Pre-Processing Settings for Deskew with the Fast Edge Output

Trigger
i. Configure to Source to be FastEdge
ii. Set the Slope to Positive