Teledyne-lecroy QPHY-SATA Manuel d'utilisateur télécharger pdf (Page 41)

QPHY-SATA Software Option

915745 Rev G 41

CALIBRATION PROCEDURES

Cable Deskewing using the Fast Edge Output (WavePro 7 Zi and WaveMaster 8Zi only)

The following procedure demonstrates how to deskew two oscilloscope 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 oscilloscope 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 20. 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 50mV/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 21. 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

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Teledyne-lecroy QPHY-SATA Manuel d'utilisateur Page 41