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5-29
Servicing
Performance Tests
2
Set the pattern generator to the following settings. For step-by-step
instructions on setting these values, refer to “Configuring the pattern
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.84 MHz
clock amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 850 mV
3
On the Agilent 83480A digital communications analyzer, perform the following
steps:
a
Press the blue shift key and then press
MEAS EYE
.
b
Press
Extinction ratio
.
c
Press
Continue
to activate the color grade.
d
Press
Dark cal
, and follow the instructions on the screen.
e
When the dark calibration is complete, press
Format
to select decibels.
f
Press
Enter
to complete the measurement setup.
4
Clear the Agilent 83480A’s display, and allow adequate time for the extinction
ratio measurement to settle.
5
The extinction ratio should measure greater than 9.0 dB.
6
Turn off the Agilent 83480A’s color grade feature, and set the persistence to 1s.
7
On the Agilent 83480A, set the persistence to 1s.
8
Press the blue shift key and then press
MASK TEST
.
9
Press
Mask Test On
.
10
Press
Create Mask
and then
Standard
. Select the OC-1 mask.
11
Press
Done
.
12
Set the mask margin to 20%.
13
Press
Mask Align
to center the mask on the eye.
Repeat this step as needed if the vertical dashed lines do not occur at the cross-
ing waist on either side of the eye.