User`s guide

Total Jitter Spec (ns) - The width used in the Bathtub View to assess the Error Probability in nanoseconds. Different
specs will yield different bathtub curves) without re-acquiring measurements.
Total Jitter Spec = 500ps Total Jitter Spec = 300ps
Transimpedance - The ratio of differential output voltage to differential control current.
Trigger - Select trigger source channel.
Trigger button - Select and configure a trigger channel.
Trigger Edge - Selects the rising or falling edge to trigger the instrument.
Trigger Method - Select Auto to set the trigger threshold voltage to the 50% voltage point of the Pulsefind values on the
selected trigger channel. Voltage is displayed in "Trigger Voltage." Select "User" to manually enter a threshold
voltage in "trigger Voltage." Limits are +/- 1.1 volts.
Trigger Options (Oscilloscope) - Permits Oscilloscope trigger options to be set including Channel, Voltage and Edge.
Trigger Voltage - Displays the threshold voltage used to trigger the instrument. If User is selected in the Trigger
Method box, the user can enter a value. Limits are +/- 1.1 volts.
UI Window - Enter the desired UI Window. Similar to entering an "eye opening" value.
Unit Interval - One Unit Interval (UI) is one cycle of the clock frequency, which is the normalized clock period. Jitter
expressed in UIs describes the magnitude of the jitter as a decimal fraction of one UI.
Units - Select unit of measure.
User Value (ps) - Entry field for the user defined Spec lines displayed on the Jitter Plot view.
Values on Plot button (
) - Clicking on button will toggle select measurement data in text format in the active tool
window. These displayed values can be selected using the Values on Plot...command in the display pull-down menu.
Values on Plot...command (Display Menu) - When
selected, a dialog box pops up providing the option
of displaying all or select measurement data in text
format in the active tool window. The example to
the right is from the High Frequency Modulation
Tool.
V. Correction - The Voltage Correction Box should be
checked when the SMA jumpers are installed for
use with the Clock Recovery. The data signal is
split and the SMA jumpers route the signal into the
IN1 measurement channel. This means that the
voltage split needs to be compensated for by using
values from the 'External Calibration with DC
offset'. By checking this box, the tools making
voltage measurements will compensate for the
jumpers.
© WAVECREST Corporation 2005 Glossary
335