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Servicing
Adjustment Procedures
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.
21
On the Agilent 83430A, press the front-panel
PRESET/VARIABLE
button so that
the
BIAS ADJUST
light is on.
22
Turn the Agilent 83430A’s front-panel
BIAS ADJUST
knob fully clockwise.
23
Adjust the
PRESET BIAS
potentiometer so that the extinction ratio measures
between 6.0 dB and 8.0 dB.
Between adjustments, be sure to clear the Agilent 83480A’s display and allow
adequate time for the extinction ratio measurement to settle.
24
Turn the Agilent 83430A’s front-panel
BIAS ADJUST
knob fully
counterclockwise.
25
Readjust the
PRESET BIAS
potentiometer so that the extinction ratio measures
slightly greater than 13.5 dB.
26
Turn the Agilent 83430A’s front-panel
BIAS ADJUST
knob fully clockwise.
27
The minimum extinction ratio should measure less than 8.0 dB.