326 Keysight M8000 Series of BER Test Solutions User Guide
6 Setting up Analyzer
Canceling Auto Align
Click this button to cancel the Auto Align, Threshold Center, or Data
Center functions while they are in progress. The following parameters will
be returned to their previous value or status:
• Auto Align Canceled
• Data Delay and Threshold values returned to previous.
• Threshold Center Canceled
• Threshold value returned to previous.
• Data Center Canceled
• Data Delay value returned to previous.
Alignment BER Threshold
In this list, select an alignment BER threshold that is appropriate for your
application.
The alignment BER threshold is the pre-defined threshold used by the
Auto Align, Threshold Center, and Data Center functions to define the
edges of the data input eye in the time and voltage axes. You may wish to
change the threshold for the following reasons:
• Choosing smaller alignment BER thresholds will cause the auto-search
functions to set more accurate sampling points. However, if the BER
threshold is set lower than the residual BER of the measurement, the
auto-search functions will fail. 1E-9 is the smallest BER threshold
available.
Sampling Point Setup Window
The Sampling Point Setup window allows you view and then manually
adjust the location of the sampling point.
It can be access though the Menu Bar. Go to Menu Bar and then click
Analyzer > Sampling Point Setup. However, if you are in the Setup View
window, you can click on the Manual Alignment… button to open the
Sampling Point Setup window.
The following figure shows the sampling point setup window for M8020A
system (M8041A and M8051A):
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