User`s guide

Channel-to-Channel Locktime Tool
Overview
Applications of the Channel-to-Channel Locktime Tool
• Measure skew between channels relative to an arm
• Measure Input/Output jitter relative to an arm
This tool is actually an automated histogram process. The tool gathers time measurements to create
many histograms. Statistical information from these histograms is then plotted.
In this tool, The Skew between channels is the measurement being made. This measurement is then
stepped out from an arm signal. A histogram of time measurements is created of the first edge on CH1
to the first edge on CH2 following the arm. The edges being measured are then incremented to create a
histogram of the
second edge on CH1 to the second edge on CH2 following the arm. The mean values
from these histograms are plotted relative to the corresponding edge increment.
The Arm must be periodic in order for the measurement process to work. A single power up or a single
frequency lock will not allow this process to occur. Using a signal from a pulse generator works well as
the Arm and lock signal.
Channel-to-Channel Locktime Setup Directions
This tool requires an Arming signal and two Clock signals.
• Verify the proper input signal levels
• Connect the clock signals to separate channels
• Connect the arm to a third channel
• Press "Acquire Options"
• Choose "Channel" and "Reference Channel" for Clock A and B.
• Press "Back" and "Arming" to go the Arm setup menu.
• Press "Arm Number" and select the channel to be used as the Arm.
© WAVECREST Corporation 2005 Section 4 - GigaView
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