Agilent Technologies J-BERT N4903B, User Manual, Page: 134 / 572

N O T E
Once you have connected the pattern generator to the N4916A/B De-Emphasis
Signal Converter, the Output Levels and Termination shown on the screen refer to
the outputs of the N4916A/B.
Check the indicated signal levels. The output voltage range of the N4916A/B is
lower than the range of the Serial BERT. The N4916A/B is first of all meant for low
voltage amplitudes. If the N4916A/B cannot generate the specified signal voltages,
they are reduced to safe levels. If this happens, you need to change the levels or
the termination.
C A U T I O N
Do not remove the connection cable between the pattern generator and the
N4916A/B while the N4916A/B is in
connected state (except for troubleshooting).
In this mode, the output levels of the pattern generator are not shown on the screen
and may present a hazard to your DUT (they have an amplitude of 1.2 V).
Controlling De-Emphasis Mode
For De-Emphasis mode, you have de-emphasis amplitude (either pre-cursor or post-
cursor) and the corresponding unit.
To change the de-emphasis amplitude value (for details see “Understanding the
N4916A/B De-Emphasis Signal Converter” on page 37 ), click inside the text field
and either:
• Enter the desired value directly with the numeric keyboard.
• Use the knob on the hardware front panel to set the value.
You can toggle between dB and percent. Toggling does not change the value.
The following topics tell you how to use the pattern generator's input ports:
•
“Bit Rate - Procedures” on page 141
• “Delay Control Input - Procedures” on page 156
• “Manually Inserting Errors” on page 157
• “Setting Up a Periodical Output” on page 162
4
Setting up the Pattern Generator
134 Agilent J-BERT N4903B High-Performance Serial BERT