5-16
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.48832 GHz
clock amplitude. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 850 mV
3Press the Agilent 83430A’s front-panel SELECT key repeatedly until the DIGITAL
IN AC COUPLED light is on.
4While turning the Agilent 83430A’s front-panel DIGITAL THRESHOLD knob fu lly
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.
5Disconnect the modulation signal from the DIGITAL IN AC COUPLED connector, and
connect it to the DIGITAL IN DC COUPLED connector.
6Press the Agilent 83430A’s front-panel SELECT key so that the DIGITAL IN DC
COUPLED light is on.
7While turning the Agilent 83430A’s front-panel DIGITAL THRESHOLD knob fu lly
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.