Performance Check-2445A/2455A Service
6. Check X-Axis Gain.
a.
Set:
NOTE
Select channels to
set
VOL
TS/DIV.
VERTICAL
CH
1
and
CH
2
VOLTS/DIV
CH
2
CH
1,
CH
3,
CH
4,
ADD,
and
BW LIMIT
CH
1 Input Coupling
CH
2 Input Coupling
HORIZONTAL
SEC/DIV
VAR
SEC/DIV
10
mV
On
Off
1
MO
DC
1
MO
GND
CW
(in
detent)
X-Y (knob
in)
b.
Connect a 50-mV standard-amplitude signal from the
Calibration Generator to the
CH
1
OR
X input connector
via a
50-0
BNC
cable.
c.
CHECK-Signal display amplitude
is
4.9 to
5.1
hor-
izontal divisions.
d.
Disconnect the test setup.
7. Check X-Axis Bandwidth.
a. Set the
CH
1 Input Coupling to
50
0
DC
.
b. Connect a 50-kHz signal from the Primary Leveled
Sine-Wave Generator to the
CH
1
OR
X input connector
via a precision
50-0 BNC cable.
c. Set the generator output for a 6-division horizontal
display.
d. Change the generator frequency to 3 MHz.
e.
CHECK-Signal display
is
greater than 4.2 horizontal
divisions.
4-34
8. Check X-Y Phase Differential.
a.
Set the Primary Leveled Sine-Wave Generator for a
1-MHz, 6-division horizontal display.
b. Set the
CH
2 VERTICAL MODE off.
CH
1 displays
automatically.
c.
Use the
CH
1 VERTICAL POSITION control to verti-
cally center the display
on
the graticule.
d. CHECK-Ellipse opening
is
0.1 division or less,
measured horizontally.
e.
Set the
CH
2 VERTICAL MODE on.
f.
Set the generator for a 2-MHz, 6-division horizontal
display.
g. Set the
CH
2 VERTICAL MODE off.
h.
CHECK-Ellipse opening
is
0.3 division or less,
measured horizontally.
i.
Set the
CH
2 VERTICAL MODE on.
9. Check X-Axis Low-Frequency Linearity.
a. Set the Primary Leveled Sine-Wave Generator
and
the
CH
1 POSITION control for a 50-kHz, 2-division hor-
izontal display centered on the graticule.
b.
Use the
CH
1 POSITION control to align the left
edge of the signal with the left side vertical graticule
line.
c. CHECK-Signal display is 1.8 to 2.2 divisions, meas-
ured horizontally.
d. Use the
CH
1 POSITION control to position the right
edge of the signal
on
the right side vertical graticule
line.
e.
CHECK-Signal display
is
1.8 to 2.2 divisions, meas-
ured horizontally.
f. Disconnect the test setup.
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