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5-18
Servicing
Performance Tests
generator” on page 5-35.
data pattern. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
23
–1
data amplitude (ECL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 850 mV p-p
data output high level (ECL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –900 mV
data termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –2 V
trigger mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CLOCK / 23
trigger pattern. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 zeros
clock rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.48832 GHz
clock amplitude. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 850 mV
3
Press the Agilent 83430A’s front-panel
SELECT
key repeatedly until the
ANALOG
IN AC COUPLED
light is on.
4
On the Agilent 83480A digital communications analyzer, perform the following
tasks:
a
Turn the optical channel on. All other channels should be turned off.
b
Enable the internal OC-48 filter.
5
Connect the Agilent 83430A to the optical channel.
6
Disconnect the modulation input cable from the
ANALOG IN AC COUPLED
connector.
7
On the Agilent 83480A, position voltage cursor 1 to the displayed unmodulated
level.
8
Turn the Agilent 83430A’s
LINE
switch off.
9
On the Agilent 83480A, position voltage cursor 2 to the displayed dark level
voltage. Do not disconnect the fiber-optic cable until the 80% modulation index
is measured.
10
Measure the voltage difference between the two cursors, multiply this value by
0.8, and position cursor 2 to where the difference equals this calculated value.
11
Turn the Agilent 83430A’s
LINE
switch on.
12
Reconnect the modulation input cable to the
ANALOG IN AC COUPLED
connector.
13
Increase the pattern generator’s data amplitude until the average (lower) peak
of the eye reaches the level indicated by voltage cursor 2.
14
The data amplitude shown on the pattern generator’s display should be
between 1.05 V p-p and 1.9 V p-p.
15
Connect the equipment as shown in the following figure.