Technical data

64 Agilent U7232A DisplayPort Electrical Performance Compliance Test Application
7 Source Non Pre-Emphasis Level Differential Tests
Source Non Pre-Emphasis Level Test
To evaluate the waveform peak differential amplitude to ensure signal is
neither over, nor under driven. (Reference: Table 3.10 VESA DisplayPort
Standard).
The source is given a range of expected output for each level setting that
correlates with the system budget elements such as cable loss and receiver
eye minimum and max values. This test ensures that the system budget is
obeyed.
The amplitude measurement is performed using the following equation at
all bit rates without pre- Emphasis and a PRBS 7 waveform:
Peak- to- peak Voltage = V
H
- V
L
where:
V
H
is the high voltage level
V
L
is the low voltage level
Test P ro ce du re
1 Start the automated testing application as described in “Starting the
DisplayPort Electrical Performance Compliance Test Application" on
page 22.
2 Connect the W2641A test fixture or other appropriate fixture to the
device under test (DUT).
3 If you are using one connection, connect the probe to one channel. If
you are using two connections, connect the two probes to two channels
of the oscilloscope. If you are using four connections, connect the four
probes to four channels of the oscilloscope.
4 Connect the SMA to SMP cable to the SMA probe head of one of the
probes and to the data lane connector on the W2641A fixture that you
want to test.
5 Connect the other SMA to SMP cable to the other SMA probe head and
to the data lane on the W2641A test fixture that you want to test.
6 In the DisplayPort Compliance Test Application, click the Set Up tab.
7 Set the Test Mode, Test Type, DUT Definition Settings, Fixture Type,
Connection Type and Number of Channels according to the type of
testing being done. Source tests are available in all the 3 test modes -
Compliance Conditions Only, User Defined Conditions and Targeted
Characterization Testing.
8 Navigate to the Non- Pre- Emphasis Level - Lane # - Non Pre- Emphasis
Level Test where # is the lane number to be tested.