User guide

Input and Output Ports - Procedures

You have to do the following to set up the pattern generator's output ports:

Setting Logic Levels and Terminations

Before you can start sending signals to your device, you have to set the logic levels

and terminations:

From the PG Setup submenu, click the Data Outputmenu item to modify Data

and Aux Data and the Clock/Trigger Output menu item to modify Clock and

Trigger.

In the Data Logic Level list, select the logic family that is appropriate for the

data input of your device.

In the Clock Logic Level list, select the logic family that is appropriate for the

clock input of your device.

When you modify the Logic Level of an output, the instrument automatically

sets the appropriate voltage levels and the Termination voltage and enables

termination.

If necessary, change the termination voltage by entering a new value. You can

also use the front panel knob to change the value.

The logic level automatically changes to Custom.

C A U T I O N

Selecting the wrong terminations may damage your device. See “Why Incorrect

Terminations Could Damage Your Device” on page 129.

Connect the DUT's input ports to the Serial BERT's output ports.

C A U T I O N

Do not apply external voltages to the pattern generator outputs. For more

information, see “AC Coupling and Bias Tees” on page 130.

Output ports of the pattern generator that are not connected to another device must

be terminated with 50 Ohm to prevent the Serial BERT from damage.

Note that for unconnected ports, an internal protection circuit automatically

reduces the output voltages to safe levels.

Setting up the Pattern Generator 4

Agilent J-BERT N4903B High-Performance Serial BERT 131