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5-42
Servicing
Adjustment Procedures
2
Connect an optical power meter to the Agilent 83430A’s front-panel
OPTICAL
OUT
connector. Use a good quality optical fiber (9/125
µ
m) and make sure the
fiber is clean before connecting.
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
Press the
SELECT
key repeatedly until the
DIGITAL IN DC COUPLED
light is on.
5
Adjust the
THRESH BIAS
potentiometer so that the output power measures
–10.0 ±0.2 dBm.
6
Connect the output of the pattern generator to the Agilent 83430A’s front-
panel
DIGITAL IN DC COUPLED
connector.
7
Configure the Agilent 70841B pattern generator to output an ECL logic level 1:
a
Set the pattern generator to the following settings. For step-by-step instruc-
tions 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51.84 MHz
clock amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 850 mV
b
Press the left-side
edit usr-pat
softkey.
c
Press
CURRENT PATTERN
,
more 1 of 3
,
set pat length
, enter the value 8, and then
press
ENTER
.
d
Press
BIN HEX
so that
HEX
is underlined.
e
Press
more 2 of 3
and then press the
F
softkey twice.
f
Press
more 3 of 3
,
more 1 of 3
, and then
set pat label
.
g
Use 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.
h
Press
more 2 of 3
,
more 3 of 3
,
save pattern
, and then
INTERNL PATT 1
.
i
Press the left-side
select pattern
softkey.