User guide

If this is selected, RJ/DJ separation is not available.
BER Threshold
To calculate the parameters for the given BER threshold. This is the BER level
for which output timing numerical values (phase margin, skew, etc.) are
calculated. It is also the upper limit of the BER range for RJ/DJ separation.
The BER threshold influences some of the parameters of the DUT Output Timing
measurement. You can also drag and drop the horizontal BER threshold in the
graphical display to change this value.
Min BER for RJ/DJ Separation
Lower limit of the BER range for RJ/DJ separation.
Residual BER for Estimated Total Jitter
BER level for which the estimated total jitter is calculated. See “Estimated Total
Jitter” on page 245 for details on how it is used.
You can select the number of Decimal Places to be displayed in the table.
Graph Tab
On the Graph tab, you can use the several options to optimize the graphical display
according to your needs.
Choose between Unit Interval and Seconds to select the timebase for the display's
x-axis.
Choose between Logarithmic and Linear to select the scale for the display's y-
axis.
For example, a DUT Output Timing measurement displayed on a linear scale may
look like this:
6 Advanced Analysis
258 Agilent J-BERT N4903B High-Performance Serial BERT
Table Number Format
Timing Units
Scale