Keysight M8000 Series of BER Test Solutions User Guide 323
Setting up Analyzer 6
Sampling Point Setup
This section provides basic information on the sampling point setup.
How Does the Sampling Point Setup Work?
The sampling point of a data signal is defined by two values: a point in time
and a voltage level. Each bit of the data signal is sampled at this point in
time and in reference to this voltage level. The point in time (in reference to
the clock signal) is referred to as the data input delay, and the voltage level
is referred to as the threshold.
The location of the sampling point is the decision factor as to whether the
incoming bits are identified as logic 0's or 1's. To measure the accurate bit
error ratio at the input port, false readings of logic 0's or 1's must be
avoided. Therefore, the sampling point must be set to the optimum
location within the data eye.
The functions within the Sampling Point Setup window allow you to:
• Prepare the Analyzer for the incoming data signal regarding the
connector termination.
• Adjust the location of the sampling point.
For details on Sampling Point Setup window, see Sampling Point Setup
Window on page 326.
Auto Alignment
Use this option to automatically set the optimum sampling point.
To perform the Auto Alignment:
1Go to the Menu Bar > Analyzer and then select Data In.
2 Select Analyzer function block from the Parameters window.
3Specify Alignment BER Threshold form the provided list.
4Click Execute button for the align sample delay and decision threshold
voltage to the received data.
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