n. Set the
CH
1 and
CH
2 Input Coupling
to
50 n DC.
o.
Connect the Calibration Generator
to
the
CH
1 OR X
input connector via a 50 n BNC cable. Do not use a
termination.
p. Check
CH
1 and
CH
2 VOL TS/DIV 50 0 Coupling
accuracy as follows:
1. Set VOL TS/DIV control
to
the first position listed
in
Table 4-3.
2.
Set the Calibration Generator STD AMPLITUDE
output level
to
the corresponding Standard
Amplitude Input Level
in
Table 4-3.
3. Use the VERTICAL POSITION control
to
set the
bottom
of
the signal 2 divisions below graticule
center.
4.
CHECK-Vertical
Deflection Accuracy (measured
against the graticule) is within the limits listed in
Table
4-3.
5. Change the VOL TS/DIV
to
the next position
listed in Table
4-3.
6.
Set the Calibration Generator
to
the correspond-
ing signal amplitude setting.
7. Repeat subparts 3 through 6
of
part p for each
VOL TS/DIV setting listed in Table
4-3.
8. Set
CH
1 and
CH
2 Input Coupling
to
1
MO
DC.
q. Move the test signal to
CH
2 and set the VERTICAL
MODE controls to display
CH
2.
r.
Return the
CH
1 VOLTS/DIV VAR control to the cali-
brated detent position.
s.
Repeat parts e through p for
CH
2.
t. Return the
CH
2 VOL TS/DIV VAR control to the cali-
brated detent position.
Performance Check-2445A/2455A Service
u.
Rotate the
~
REF OR
DL
Y control CCW until the
cursor stops moving.
v.
CHECK-Cursor
is aligned with the bottom graticule
line within
± 0.2 division.
w. Rotate the
~
control CW until the cursor stops
moving.
x.
CHECK-Cursor
is aligned with the
top
graticule line
within
±0.2
division. Push
~V
to
turn off cursors.
y.
Turn the INVERT function on, and obtain a 5--division
signal
as
explained
in
part g.
ZZ.
VERIFY-A
down-arrow symbol appears to the left
of
the
CH
2 VOL TS/DIV readout.
aa.
CHECK-Display
amplitude is between 4.9 divisions
and
5.1 divisions
in
amplitude (5 divisions ± 2%). Turn the
INVERT function off when finished.
bb. Connect a 5 V standard-amplitude signal from the
Calibration Generator
to
the
CH
1 OR X and
CH
2 input
connectors via a 50
n BNC cable and a Dual-Input
Coupler.
cc. Set:
VOLTS/DIV
CH
1 and
CH
2
VERTICAL MODE
CH
1 and
CH
2
ADD
VAR
2V
Off
On
In
Detent
dd.
CHECK-Vertical
deflection amplitude is 4.9
to
5.1
divisions.
ee.
VERIFY-A
+ (plus) symbol appears
to
the left
of
· the
CH
2 VOL TS/DIV readout.
ff.
CHECK-Signal
amplitude reduces
to
0.2 division
or
less
when
CH
2 INVERT
is
on.
4-9
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