User guide

External PLL Clock Divider and Multiplier
The internal clock (i.e. the bitrate) is the external PLL divided by the value specified
in the divider field and multiplied with the value specified in the multiplier field.
The external PLL clock divider and multiplier field are available if you have chosen
an external PLL clock source.
Value and Units
This text field allows manual entry of the clock rate value. Click inside this text
field and use the numerical keypad or front panel knob to enter a clock rate value.
Complete the entry with a frequency unit by pressing the G/n, k/m, M/µ, or X1
front panel key.
Preset List
The Preset list contains clock rate values that are commonly used by the pattern
generator.
Click a preset to select it for the pattern generator clock rate.
User presets can be modified. To do so, double-click the preset. System presets
can not be modified.
Add Preset Button
Click this button to open the Enter Bit Rate dialog box and add a new clock rate to
the preset list. In this dialog box you can enter a value, unit and text description of
the new clock rate.
Delete Preset Button
Select a preset clock rate in the Preset list and click this button to remove it from
the list. You can only delete presets that are user-defined.
4 Setting up the Pattern Generator
144 Agilent J-BERT N4903B High-Performance Serial BERT