Keysight M8000 Series of BER Test Solutions User Guide 517
Working with Measurements 8
Step Size
Table 72 Step size descriptions for characterization algorithms
Name Description
Binary Step Size The Step Size for the Binary algorithm defines the exit criteria for
the algorithm. The Binary search algorithm stops once its step size
falls below this user defined Step Size.
The Binary Step Size applies to the Binary algorithm and the binary
portions of the Binary + Down Linear and Binary + Up Linear
algorithms..
Linear Step Size This defines the step size for each step of the Up Linear and Down
Linear algorithms.
When Down Linear is enabled as the search algorithm, the
measurement starts from the maximum (which depends on the
jitter frequency). A step size of 100 mUI, for example, may result in
a sequence of 1000 UI, 999.9 UI, 999.8 UI, and so on. The test for
one frequency stops when the BER limit is met or minimum
specified amplitude is reached.
When Up Linear is enabled as the search algorithm, the
measurement starts from the minimum. A step size of 100 mUI, for
example, will result in a sequence of 0.1 UI, 0.2 UI, 0.3 UI, and so
on. The test for one frequency stops when the BER limit is
exceeded or the maximum amplitude is reached.
Log Step Size This defines the step size for each step of the Up Logarithmic and
Down Logarithmic algorithms.
When Down Logarithmic is enabled as the search algorithm, the
measurement starts from the maximum (which depends on the
jitter frequency). A percentage of 50%, for example, may result in a
sequence of 1000 UI, 500 UI, 250 UI, and so on. The test for one
frequency stops when the BER limit is met or the specified
minimum amplitude is reached.
When Up Logarithmic is enabled as the search algorithm, the
measurement starts from the specified minimum amplitude. A
percentage of 50%, for example, may result in a sequence of 0.1
UI, 0.15 UI, 0.23 UI, and so on. The test for one frequency stops
when the BER limit is crossed or the maximum amplitude (which
depends on the jitter frequency) is reached.
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