536 Keysight M8000 Series of BER Test Solutions User Guide
8 Working with Measurements
•In case the Step Accumulation End is selected as Pass/Fail, set Target
Error Ratio and Target Confidence Level.
• Target Error Ratio - This parameter sets the target error ratio of the
accumulated results.
• Target Confidence Level - This parameter sets the target
confidence level of the accumulated results.
•In case the Step Accumulation End is selected as No. of Bits, specify
Number of Compared Bits and Number of Errors.
• Number of Compared Bits - This parameter allows the user to
specify the number of compared bits; that would be used as criteria
for moving to the next measurement point in case when the sample
delay optimization is “NONE”.
• Number of Errors - This parameter enables the user to set the
additional no. of errored bits to consider while moving to the next
measurement points. To enable this feature, you have to click on the
toggle button.
• Pre BER Alignment - This parameter sets the pre BER alignment
criteria before it sweeps to next measurement point. The choices are:
• None - This parameter does not initiate any pre BER alignment.
• Data Alignment - This parameter initiates pattern
resynchronization.
• Sample Delay Optimization - This parameter initiates search for the
value of data/clock delay that puts the active clock edge in the
center of the data eye, midway between the two relative delay
points with a measured BER
• Threshold Optimization - This parameter initiates search for the 0/1
threshold voltage midway between the two 0/1 threshold voltages
with a measured BER
• Full Sample Point Optimization - This parameter initiates auto
alignment.
Graph Setup
The graph setup includes the following parameters:
• Vertical Axis Scale – This parameter specify the Y axis scale. The
choices are Linear and Logarithmic. If Linear is specified then the BER
values are in terms of a linear scale. If Logarithmic is specified then the
BER values are in terms of a logarithmic scale.
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