Adjustment Procedure-2445A/2455A Service
CAL
07-READOUT
CENTERING
AND
GAIN
e.
Adjust Bandwidth Limit.
a.
Set:
7. Check/Adjust Readout Centering and Gain
(R2918 R2931)
See ADJUSTMENT LOCATIONS 1
at
the
back
of
this manual for test point and adjustment locations.
a.
Scroll
to
CAL 07.
b.
Press and release the upper TRIGGER COUPLING
switch to initiate the routine.
c.
CHECK-Readout
displays large 8 characters
in
the
top line
and
BWL characters
in
the bottom line.
d.
ADJUST
-Readout
Centering (R2918) and Gain
(R2931) so the top
of
the large B's and the bottom
of
the
BWL characters
are
¼
to
½ minor division from the top
and bottom Horizontal Graticule lines.
e.
Press and release the lower TRIGGER COUPLING
switch.
f.
Return the CAL/NO CAL jumper
to
the
NO
CAL
position.
g.
Press the
A/8
TRIG button
to
return
to
normal
operation.
5-20
VERTICAL
CH
1
CH
2,
CH
3,
and
CH
4
CH
1 POSITION
CH
1 VOL TS/DIV
CH
1 VAR
CH
1 Input Coupling
20 MHz BW LIMIT
HORIZONTAL
POSITION
X10 MAG
A SEC/DIV
SEC/DIV VAR
·rRIGGER
HOLDOFF
LEVEL
A/8
TRIG
SLOPE
MODE
SOURCE
COUPLING
On
Off
Midrange
10mV
In
detent
1
MO
DC
On
Midrange
Off
1
µS
(knob
in)
In
detent
MIN (Fully CCW)
Midrange
A
+
AUTO LVL
VERT
DC
b.
Connect a fast-rise, positive-going square-wave out-
put via a precision
50-0 cable, a 50-0 1
OX
attenuator, and
a
50-0 termination
to
the
CH
1 input connector.
c.
Set the generator
to
produce a 100-kHz, 5-division
display.
d.
ADJUST
-Coil
L644 for as flat a response as
possible.
e.
Disconnect the test equipment from the instrument.
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