c.
CHECK-
The display reads
DC
BALANCE
IN
PRO-
GRESS for approximately 10 seconds, then the display
returns
to
normal.
d.
CHECK-For
less than 0.2-division + 0.5 mV verti-
cal trace shift when the
CH
1 VOL TS/DIV switch is rotated
through
all
of
its settings.
e.
Set the VERTICAL MODE switches
to
disable
CH
1
and display
CH
2.
f.
CHECK-For
less than 0.2-clivision + 0.5-mV vertical
trace shift when the
CH
2 VOL TS/DIV switch is rotated
through
all
of
its settings.
4. Adjust X-Y Phasing (C118).
a.
Set:
VERTICAL
CH
1
CH
2,
CH
3,
and
CH
4
CH
1 VOL TS/DIV
CH
1 Input Coupling
BW LIMIT
HORIZONTAL
SEC/DIV
On
Off
50mV
500
DC
Off
X-Y
Adjustment Procedure-2445A/2455A Service
b.
Connect the Primary Leveled Sine-Wave Generator
to
the
CH
1 OR X input connector via a 50-U BNC cable.
c.
Set the generator frequency
to
1 MHz and adjust the
amplitude for a 6-clivision vertical signal display.
d. Use the
CH
1 POSITION control to vertically center
the display on the graticule.
e.
ADJUST
-X-Y
Phasing (C118) for no opening
in
the
ellipse.
f.
Set the generator frequency
to
2 MHz and adjust the
amplitude for a 6-clivision vertical signal display.
g.
CHECK-Horizontal
opening in the ellipse is 0.3 divi-
sion or less, measured at the center horizontal
graticule line.
i.
Disconnect the test setup.
j. Turn POWER Off.
5-23
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