Teledyne LeCroy LabMaster 10Zi Getting Started Manual - Manual (Page 42)

Getting Started Manual
LM10Zi-GSM-E Rev A 35
LabMaster Calibration
The ChannelSync™ architecture in LabMaster modular oscilloscope
systems utilizes a single 10 GHz distributed clock for all acquisition
modules. This provides precise timing alignment and timing accuracy
between all channels in all acquisition modules as found in a single,
conventional oscilloscope package. However, to ensure that the static
skew of all connecting cables is accounted for, a calibration is required
for the most accurate results.
Calibration eliminates:

Static skew due to minor differences in length of PCIe
interconnection cables. LabMaster modular oscilloscopes may
consist of multiple acquisition modules. These multiple modules
need to deskewed with respect to each other to account for
connection cable propagation delay (static skew). This
propagation delay is normally 100-200 ps and is a result of the
very small differences in length between the PCIe cables used for
connections on your particular LabMaster setup.

Minor static skew differences between channels in a single
acquisition module.

The small amount of static skew resulting from the factory
hardware deskew. At the factory, channels in each Acquisition
Module are deskewed in hardware to within approximately 2 ps.
at 20 GHz. Depending on the timing accuracy desired for your
measurements and the bandwidth of your acquisition module,
you may need to correct for this.

Static skew introduced by probe and cable connections. With
probes and cables connected to the acquisition module,
additional static skew will be introduced. When these devices are
attached, deskew signals must be respectively deskewed to each
other is again required to eliminate the propagation delay of the
signal due to these items being added to the signal path.