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5-16
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.48832 GHz
clock amplitude. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 850 mV
3
Press the Agilent 83430A’s front-panel
SELECT
key repeatedly until the
DIGITAL
IN AC COUPLED
light is on.
4
While turning the Agilent 83430A’s front-panel
DIGITAL THRESHOLD
knob fully
clockwise and fully counterclockwise, observe the following items:
• The eye is not squelched for any setting of the knob.
• The eye diagram’s zero crossing varies as the knob is turned.
• The eye diagram’s zero crossing should be approximately in the middle
when the knob is set to its center position.
5
Disconnect the modulation signal from the
DIGITAL IN AC COUPLED
connector, and
connect it to the
DIGITAL IN DC COUPLED
connector.
6
Press the Agilent 83430A’s front-panel
SELECT
key so that the
DIGITAL IN DC
COUPLED
light is on.
7
While turning the Agilent 83430A’s front-panel
DIGITAL THRESHOLD
knob fully
clockwise and fully counterclockwise, observe the following items:
• The eye is not squelched for any setting of the knob.
• The eye diagram’s zero crossing varies as the knob is turned.