HP 8566B Adjustment Manual page 207

4. Final Display Adjustments (SN 3004A and Above)
9.
Press
REFERENCE LEVEL
level to bring the displayed noise to the top division of the
graticule
dB/DIV. The noise should now completely fill
pattern, illuminating a large rectangular area. If necessary, adjust
the reference level until the graticule pattern is completely filled.
10. Press SWEEP CslNGLE), [SHIFT) DISPLAY LINE m, and then
graticule pattern.
Connect a 56503 photometer probe to the Tektronix J-16 digital
photometer. Set the photometer to the Xl range.
11. Place the photometer light probe hood against the IF-Display
Section glass RF1 filter, and adjust AlA2R319 INT GAIN for a
photometer reading of 80 NITS (cd/m2).
This reading must be made with the glass RF1 filter in place in front of
the CRT. It might be necessary to slightly trim the top and bottom of
the photometer probe's hood so that it will fit flush against
If a standard J-16 photometer is used (instead of metric option 02),
adjust AlA2R319 for a photometer reading of 23.5 fl (foot-lamberts).
12. Set the spectrum analyzer LINE switch to STANDBY and then
back to ON. The spectrum analyzer power-up annotation should
be visible on the CRT display. (This includes the firmware
datecode.)
13. For the best focus near the center of the CRT display, adjust the
following potentiometers in the sequence listed below. Repeat as
needed to optimize center-screen focus.
vectors)
14. Adjust AlA2R426 T/B FOC for best focus at the top and bottom of
the display.
15. Adjust AlA2R437 R/L FOC for best focus at the right and left
sides of the display.
16. If the top and bottom (or right and left sides) of the display
achieve best focus at different potentiometer settings, adjust
focus.
]
and then adjust the reference
Press and key in 1
the CRT graticule
Adjustments 3-67
the glass