g.
Set the generator amplitude for a 3-
to
5-division
display amplitude. Use the
CH
1
and
CH
2 POSITION con-
trols
to
vertically overlay the traces near the center of the
graticule
area.
h.
Set the Horizontal POSITION control
to
set the rising
edge of the signals near the center vertical graticule line.
i.
Press
and
release the X10 MAG button
to
obtain a
magnified display.
j. Pull out the SEC/DIV knob.
k.
CHECK-That
the readout indicates
"CH
2
DLY-
TURN
!:,,."
and
that the
t:,,.
control will move the leading
edge of the
CH
2 trace at least 0.5 division to either side
of the
CH
1 trace.
I.
ADJUST-!:,,. control
to
superimpose the leading
edges.
m.
Push
in
the SEC/DIV knob.
NOTE
If
the CH 2 Delay Adjust feature is to be disabled tor
normal instrument
use,
perform the following steps;
otherwise, proceed to CAL
05.
n.
Reenter the Diagnostic Monitor by pressing the
t:,,.V
and
t:,,.t
buttons simultaneously (hold them
in),
then press
and
hold the TRIGGER SLOPE button.
Release
the but-
tons after about 1 second.
o.
Scroll
to
CAL 04.
p.
Press
and
release the upper TRIGGER COUPLING
switch until the readout indicates
"DISABLED."
q.
Press
and
release the
NB
TRIG button to return
to
normal operating mode.
Adjustment
Procedure-2445A/2455A
Service
CAL
05-Set
HRS
ON
and
PWR
ON/OFF cycles.
5.
Check/ Adjust
Hours
On
and Power On/Off
cycles.
a.
Scroll
to
CAL
05.
b.
Press and release the upper TRIGGER COUPLING
switch
to
initiate the routine.
c.
CHECK-Readout
indicates
HRS
ON
xxx
PWR
ON/OFF
XXX
and!:,,.!:,,.
REF
HRS
t:,,.
PWR
PUSH
MAG 10/1.
d. Press
and
release the lower TRIGGER SOURCE and
then press and release the lower TRIGGER MODE
to
reset HRS
ON
and
PWR
ON/OFF
to
zero.
NOTE
HRS ON and PWR ON/OFF can
be set to any value
from 0-99999 with the
.:l
REF and
.:l
controls.
e.
Press and release the lower TRIGGER COUPLING
switch
to
exit routine.
CAL
06-VERTICAL
TRANSIENT
RESPONSE
6. Check/ Adjust Vertical Transient Response
a.
Scroll
to
CAL
06.
b.
Press
and
release the upper TRIGGER COUPLING
switch
to
initiate the routine.
c.
CHECK-Readout
indicates ADJ
t:,,.
(step)
1,
10 mV,
100
ns.
5-17
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