Performance Check-2445A/2455A Service
q. CHECK-Amplitude of each trace other than
CH
2 is
0.16 division or less (discount trace width).
r. Disconnect the test setup.
8.
Set
CH
1 and
CH
2
DC
Balance.
NOTE
For an accurate
DC
Balance setting, the instrument
MUST
be allowed to warm up for
20
minutes before
performing the following steps.
a.
Press both the
CH
1
and
CH
2 upper Input Coupling
buttons for approximately
1 second, then release them.
b.
VERIFY-DC
BALANCE
IN
PROGRESS
is
in
top
line of readout. A flashing dot may
be
displayed. The
display returns
to
normal in approximately 15 seconds.
c.
VERIFY - There is
less
than 0.2 division + 0.5
mV
vertical trace shift between adjacent settings of the
CH
1
and
CH
2 VOL TS/DIV
as
they are rotated through each of
their positions.
d.
VERIFY-There
is
less than 0.2 division vertical
trace shift between the
CH
3
and
CH
4 VOL TS/DIV
settings.
e.
VERIFY-
There is less than 1.0 division vertical
trace shift
as
the
CH
1
and
CH
2 VOL TS/DIV VAR con-
trols
are
rotated fully CCW.
f.
VERIFY-
There
is
less than 0.5 division vertical trace
shift when the INVERT button is pressed.
g. Return the VERTICAL VAR controls
to
their detent
positions
and
turn the
CH
2 INVERT function off.
9.
Check
CH
2 SIGNAL OUT and Cascaded
Operation.
a.
Set:
NOTE
Temporarily select CH 2 to
set
CH 2
VOL
TS/DIV.
4-14
VERTICAL
CH
1 On
CH
2,
CH
3,
and
CH
4 Off
20 MHz BW LIMIT
On
VOLTS/DIV
CH
1
and
CH
2
Input Coupling
CH
1
and
CH
2
HORIZONTAL
A SEC/DIV
TRIGGER
MODE
SOURCE
COUPLING
2mV
1
MO
DC
200
µs
(knob
in)
AUTO LVL
VERT
HF
REJ
b.
Connect a 1 kHz, 1 mV standard-amplitude signal
from the Calibration Generator
to
the
CH
2 input connec-
tor via a
50-0 BNC cable.
c.
Connect the
CH
2 signal from the rear -panel
CH
2
SIGNAL OUT connector to the
CH
1
OR
X input connec-
tor via a precision
50-0 BNC cable.
d.
CHECK-Display
amplitude is 4.5
to
5.5 divisions
(discount trace width).
e.
Set
CH
2 Input Coupling to
GND
and
align the
CH
1
trace with the center graticule
line.
f.
CHECK-
Trace noise
is
1.2 divisions peak to peak or
less.
g. Set
CH
1 Input Coupling to
GND
and
align the trace
with the center graticule line.
h.
Return
CH
1 Input Coupling
to
1
MO
DC
.
i.
Set the
CH
1 VOL TS/DIV to 10
mv.
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