User guide

Input and Output Ports - Reference
The pattern generator produces clock and data outputs that serve as frequency
reference and device stimulus for the device under test.
N O T E
The Serial BERT will not allow you to adjust a voltage beyond its limits. The limit is
determined by the Serial BERT's internal hardware. If a limit is encountered, the
Serial BERT sends a message to the status bar. For more information about voltage
limits, see the pattern generator's technical specifications.
N O T E
The parameters listed in the Pattern Generator's Data Out window will be disabled
if you select M8061A from the External Instrument(s).
Vhi
This text field allows manual entry of the logic high voltage level and displays the
current value.
To modify the value, click inside the text field and either:
• Enter the desired value directly with the numeric keyboard.
• Use the knob by the numeric keyboard to fine-tune the value.
See “Understanding the Output Level Parameters” on page 126 for information
about how the Serial BERT modifies the output levels.
Vof
This text field allows manual entry of the voltage level halfway between logic high
and logic low (the offset) and displays the current value.
To modify the value, click inside the text field and either:
• Enter the desired value directly with the numeric keyboard.
• Use the knob by the numeric keyboard to fine-tune the value.
T I P
You can also adjust Data and Clock V
of
with the Data Offset and Clock Offset knob
on the front panel.
See “Understanding the Output Level Parameters” on page 126 for information
about how the Serial BERT modifies the output levels.
Setting up the Pattern Generator 4
Agilent J-BERT N4903B High-Performance Serial BERT 135