5-29
Servicing
Performance Tests
2Set 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223–1
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
3On the Agilent83480A digital communications analyzer, perform the following
steps:
aPress the blue shift key and then press MEAS EYE.
bPress Extinction ratio.
cPress Continue to activate the color grade.
dPress Dark cal, and follow the instructions on the screen.
eWhen the dark calibration is complete, press Format to select decibels.
fPress Enter to complete the measurement setup.
4Clear the Agilent 83480A’s display, and allow adequate time for the extinction
ratio measurement to settle.
5The extinction ratio should measure greater than 9.0 dB.
6Turn off the Agilent 83480A’s color grade feature, and set the persistence to 1s.
7On the Agilent 83480A, set the persistence to 1s.
8Press the blue shift key and then press MASK TEST.
9Press 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.