Adjustment Procedure-2445A/2455A Service
DYNAMIC CENTERING,
DC
BALANCE, AND X-Y PHASE
DIFFERENTIAL ADJUSTMENTS
Equipment Required (see Table 4-1)
Primary Leveled-Sine Wave Generator (Item
2)
Calibration Generator (Item 3)
50
n BNC Cable (Item 10)
See ADJUSTMENT LOCATIONS 1
5X Attenuator (Item 17)
Alignment Tool (Item 20)
and ADJUSTMENT LOCATIONS 4
at
the back
of
this manual for test point and adjustment locations.
INITIAL CONTROL SETTINGS
Control settings not listed
do
not affect the procedure.
VERTICAL
CH
1 and
CH
2
VOLTS/DIV
CH
1 VAR
CH
2 VAR
CH
1 and
CH
2
Input Coupling
CH
1
CH
2,
CH
3 and
CH
4
ADD, INVERT, and
BW LIMIT
ALT/CHOP
POSITION
HORIZONTAL
A SEC/DIV
B SEC/DIV
SEC/DIV VAR
POSITION
TRIGGER
MODE
SOURCE
COUPLING
SLOPE
LEVEL
HOLDOFF
10 mV
CCW (out
of
detent)
In
detent
son
DC
On
Off
Off
ALT
Midrange
10
µS
100 ns (knob in)
In
detent
Midrange
AUTO LVL
VERT
DC
+ (plus)
Midrange
Minimum (CCW)
Delta
t:N
TRACKING/INDEP
~
REF
OR
DL Y
POS
and~
Display
INTENSITY
READOUT INTENSITY
SCALE ILLUM
FOCUS
On
(RATIO readout)
INDEP
Cursors near the 3rd line
above
and
3rd line below
graticule center
(6
division spacing)
Left
of
center
Right
of
center
Fully CCW
Best focused display
1.
Adjust Dynamic Centering (R3401 and R3407).
a.
Connect a 5-clivision, 6-MHz signal from the Primary
Leveled Sine-Wave Generator
to
the
CH
1 or X input via a
50-n BNC cable.
b. Rotate the INTENSITY control froni fully CCW
to
fully CW and note any horizontal and vertical shift that
occurs
in
the displayed waveform.
c.
ADJUST
-Horizontal
Dynamic Centering (R3401)
to
minimize the horizontal component
of
the shift.
d.
ADJUST-Vertical
Dynamic Centering (R3407)
to
minimize the vertical component
of
the shift.
5-21
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