Keysight M8000 Series of BER Test Solutions User Guide 515
Working with Measurements 8
Down logarithmic The Down Logarithmic search algorithm starts at the maximum
jitter value determined by the template.
If a BER measurement has errors above the measurement
threshold, the jitter amplitude is adjusted lower by the coefficient
calculated from the logarithmic step size. For example, if the
coefficient is 10%, then the next amplitude equals the previous
amplitude minus 10% of the previous amplitude.
This algorithm exits when the BER is measured below the
measurement threshold BER, or if the last amplitude
measurement point was at the minimum jitter value in the
template.
The jitter tolerance result at each jitter modulation frequency is
the highest jitter amplitude at which the measurement was made
below the threshold BER. However, if the device is intolerant of
even the minimum jitter value, the result is not valid and is not
plotted.
Up linear The Up Linear search algorithm starts at the minimum jitter value
determined by the template.
If a BER measurement has errors below the measurement
threshold, the jitter amplitude is adjusted higher by the linear step
size.
This algorithm exits when BER is measured above the
measurement threshold BER, or if the last amplitude
measurement point was at the max jitter value in the template.
The jitter tolerance result at each jitter modulation frequency is
the highest jitter amplitude at which the measurement was made
below the threshold BER. However, if the device is intolerant of
even the minimum jitter value, the result is not valid and is not
plotted.
Up logarithmic The Up Logarithmic search algorithm starts at the minimum jitter
value determined by the template.
If a BER measurement has errors below the measurement
threshold, the jitter amplitude is adjusted higher by the coefficient
calculated from the logarithmic step size. For example, if the
coefficient is 10%, then the next amplitude equals the previous
amplitude plus 10% of the previous amplitude.
This algorithm exits when the BER is measured above the
measurement threshold BER, or if the last amplitude
measurement point was at the maximum jitter value determined
by the template.
The jitter tolerance result at each jitter modulation frequency is
the highest jitter amplitude at which the measurement was made
below the threshold BER. However, if the device is intolerant of
even the minimum jitter value, the result is not valid and is not
plotted.
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