Agilent Technologies HP 8566B Spezifikationen Seite 177

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Seitenansicht 176
2. High-Voltage Adjustment (SN 3001A and Below)
i
..___
-_.-
..~................~.
-
._..
i
.._.....
-
.._.........................................--.....................
!
-250.000
US
0.00000
s
250.000
us
50.0
us/div
1
f
75.00
v
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 . .
. .
.
.
.
.
.
. .
.
.
. .
.
.
.
.
.
.
.
.
.
500
kHz
wave . . . , ,
.
.
.
.
.
amplitude . .
.
.
.
. .
Y input
52:
frequency . .
.
.
.
. .
.
.
.
. .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
1
kHz
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
AlA3TP5. As the INTENSITY control is turned clockwise, the
peak-to-peak voltage at
AlA3TP5
will drop. To prevent long-term
CRT damage, this voltage should not drop below (V,,
-
5O)V,, or
Adjustments 3-37
Seitenansicht 176
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