5-42
Servicing
Adjustment Procedures
2Connect an optical power meter to the Agilent 83430A’s front-panel OPTICAL
OUT connector. Use a good quality optical fiber (9/125 µm) and make sure the
fiber is clean before connecting.
3Turn the Agilent 83430A on, and press both front-panel PRESET/VARIABLE
buttons so that the WAVELENGTH ADJUST and BIAS ADJUST lights are off.
4Press the SELECT key repeatedly until the DIGITAL IN DC COUPLED light is on.
5Adjust the THRESH BIAS potentiometer so that the output power measures
–10.0±0.2 dBm.
6Connect the output of the pattern generator to the Agilen t 83430A’s front-
panel DIGITAL IN DC COUPLED connector.
7Configure the Agilent 70841B pattern generator to output an ECL logic level 1:
aSet the pattern generator to the following settings. For step-by-step instruc-
tions on setting these values, refer to “Configuring the pattern g enerator” 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
bPress the left-side edit usr-pat softkey.
cPress CURRENT PATTERN, more 1 of 3, set pat length, enter the value 8, and then
press ENTER.
dPress BIN HEX so that HEX is underlined.
ePress more 2 of 3 and then press the F softkey twice.
fPress more 3 of 3, more 1 of 3, and then set pat label.
gUse the displayed softkeys to create a label to identify this new pattern. It
will minimize confusion as you use the pattern generator. Enter the suggest-
ed label ALL ONES. Press FINISH ENTRY when you have finished entering all
the letters in the label.
hPress more 2 of 3, more 3 of 3, save pattern, and then INTERNL PATT 1.
iPress the left-side select pattern softkey.