Crt Cut-Off Voltage - HP 8566B Adjustment Manual

2. High-Voltage Adjustment (SN 3001A and Below)
Figure 3-9. CRT Cut-Off Voltage
35. Connect a separate function generator to each of the X and Y
inputs of the Display Adjustment Board, as shown in Figure 3-5.
Set the function generators as follows:
X input Jl:
frequency . .
wave . . . , ,
amplitude . .
Y input 52:
frequency . .
wave . . . . . .
amplitude . .
36. Adjust AlA2R35 INT LIMIT clockwise until the display is just
visible.
37. Adjust AlA4R7 POS, AlA5R7 POS, and if necessary the function
generator dc offsets for a full-screen illumination.
38. Set the front-panel INTENSITY control fully counter-clockwise,
and, if it is not sealed, adjust AlA2R5 INT GAIN fully clockwise.
Adjust AlA2R35 INT LIMIT just below the threshold at which the
display illumination becomes visible.
39. Slowly adjust the front-panel INTENSITY control through its
entire range while monitoring the peak-to-peak voltage at
peak-to-peak voltage at AlA3TP5 will drop. To prevent long-term
CRT damage, this voltage should not drop below (V,, - 5O)V,, or
!
5 0 0
1 kHz
Adjustments 3-37