5-45
Servicing
Adjustment Procedures
ePress Continue to activate the color grade.
fPress Dark cal, and follow the instructions on the screen.
gWhen the dark calibration is complete, press Format to select decibels.
hPress 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 Agilent83430A’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 Agilent83430A’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 Agilent83430A’s front-panel BIAS ADJUST knob fully clockwise.
27 The minimum extinction ratio should measure less than 8.0 dB.