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Servicing
Performance Tests
3
Turn the Agilent 83430A on, and press both front-panel
PRESET/VARIABLE
buttons so that the
WAVELENGTH ADJUST
and
BIAS ADJUST
lights are off.
4
On the Agilent 83480A digital communications analyzer, adjust the amplitude
scale, time scale, and offsets as needed.
5
Adjust the Agilent 83430A’s front-panel
DIGITAL THRESHOLD
knob so that a zero
crossing occurs at center screen (approximate 50% crossing).
6
On the Agilent 83480A, perform the following steps:
a
Turn the optical channel on. Turn all other channels off.
b
Enable the internal OC-48 filter.
c
Press the blue shift key and then press
MEAS EYE
.
d
Press
Extinction ratio
.
e
Press
Continue
to activate the color grade.
f
Press
Dark cal
, and follow the instructions on the screen.
g
When the dark calibration is complete, press
Format
to select decibels.
h
Press
Enter
to complete the measurement setup.
7
Clear the Agilent 83480A’s display, and allow adequate time for the extinction
ratio measurement to settle.
8
The extinction ratio should measure greater than 9.0 dB.
9
On the Agilent 83480A, set the persistence to 1s and turn off the color grade.
10
Press the blue shift key and then press
MASK TEST
.
11
Press
Mask Test On
.
12
Press
Create Mask
and then
Standard
. Select the OC-48 mask.
13
Press
Done
.
14
Set the mask margin to 10%.
15
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.
16
Press
Run Until
, and wait for 300 waveforms to be processed.
17
Press the blue shift key and then press
Eye mask
to display the eye mask results.
Verify that there are no mask or margin hits.