Teledyne LeCroy Zi Oscilloscope Synchronization ProBus Module (Zi-8CH-SYNCH) - Manual (Page 12)

Zi Oscilloscope Synchronization Module
12 918246‐00‐RevA
5. Upon completion of either User Edge or Periodic deskew adjustments; the Master and Slave oscilloscope
now have one channel deskewed in reference to one another. You now need to deskew the remaining
channels on the Master oscilloscope with reference to the Master reference channel, and the remaining
channels on the Slave oscilloscope with reference to the Slave reference channel.
Using Master and Slave Deskew Channel References to Deskew the
Remaining Channels
After using your signal reference to deskew C2 (Master) and C2 (relabeled C6, Slave), deskew the remaining
channels in the following manner.
Deskewing Remaining Slave Channels
• Disconnect the SMA power splitter or PCF‐200 Deskew Fixture from the C2 (Master) input and connect to
the C3 (or relabeled C7) channel on the Slave oscilloscope. Use the previous 1‐4 steps to deskew C3
(relabeled C7) to C2 (relabeled C6) on the Slave.
Note: Do not adjust the deskew on the C2 (relabeled C6, Slave) Channel since this is the reference.
Always adjust deskew on the other Slave channels C3 (relabeled C7), C4 (relabeled C8), and C1
(relabeled C5) to this reference.
• Repeat the previous step for the remaining C4 (relabeled C8), and C1 (relabeled C5) Slave channels.
• Upon conclusion of these steps, all Slave channels are deskewed with reference to the C2 (relabeled C6)
Slave reference established earlier.
Deskewing Remaining Master Channels
• Disconnect the SMA power splitter or PCF‐200 Deskew Fixture from the Slave oscilloscope cables or
probes and connect it to the Master oscilloscope cables and probes. One of the connections should be to
C2 (Master), and the other to C3 (Master).
• Use the previous 1‐4 steps to deskew C3 (Master) to C2 (Master).
Note: Do not adjust the deskew on the C2 (Master) Channel since this is the reference. Always adjust
deskew on the other Master channels C3, C4, and C1 to this reference.
• Repeat the previous step for the remaining C4, and C1 Master channels.
• Upon conclusion of these steps, all Master channels are deskewed with reference to the C2 (Master)
reference established earlier.
Obtaining Most Accurate Results
The above procedure describes the most accurate deskew possible using the Zi‐8CH‐SYNCH. However, more
accuracy may be obtained through an additional manual adjustment of single long acquisitions of customer
data.
For instance, the Master and Slave oscilloscopes can be deskewed with reference to each other within 2.5 ps
rms
,
and individual channels on the Slave or Master can be deskewed to much better than 1 ps with reference to
each other. However, a user may desire better than 2.5 ps
rms
skew between the Master and Slave channels.
In this case, deskew the Master and Slave oscilloscopes as described above, and then use the long memory of
the LeCroy oscilloscopes to make a single long acquisition. Once the acquisition is completed and all channels
are displayed on the Master display grid, create zoom waveforms of the C2 (Master) and C2 (relabeled C6,
Slave) previously used as reference channels for deskewing the Master to the Slave oscilloscope.