f.
Push
the upper
TRIGGER
MODE button.
g.
Use
the
~
REF
OR
DL
y
POS
and
~
controls to
select
SWP
B,
START
A,
and
DLV
BY
B.
h.
Push
the upper TRIGGER MODE button.
i.
Pull
out the SEC/DIV knob.
j.
Use
the
~
REF
OR
DL
y
POS
and
the
~
controls to
set the number of delaying events to
1 .
k.
VERIFY-
That the intensified zone moves to
each
succeeding rising edge as the delaying event count is
changed to
2,
3,
4,
and
5.
8. Check Logic Trigger.
a.
Set the A
and
B SEC/DIV to 20
ns
(knob out).
b.
Set the time-mark generator to produce 0.1-µs time
markers.
c.
Set the pulse generator to produce a positive 5-ns
pulse when externally triggered.
d.
Set the B TRIGGER MODE to
TRIG
AFT
DLY.
e.
Set the B TRIGGER SOURCE to
CH
1.
f.
Set the B TRIGGER MODE to
MENU.
g.
Turn either
~
control clockwise to underline LOGIC-
TRIG.
h.
Push
the upper TRIGGER MODE button.
i.
Turn the
~
control to underline A:A·B.
(On
instru-
ments without Option
09,
underline A·B).
j.
Push
the upper
TRIGGER
MODE button.
k.
Push
in
the SEC/DIV knob.
Performance
Check-2445A/2455A
Service
I.
Adjust the B TRIGGER LEVEL for a readout of
o.oov.
m.
Push
the A/8 MENU button to illuminate
an
A
TRIGGER MODE indicator.
n.
Adjust the A TRIGGER LEVEL for a readout of
1.00
V.
o.
Set the
CH
1 Input Coupling to
GND.
p.
Tum the
CH
1 POSITION control to align the trace
with the center horizontal graticule line; do not readjust
the
CH
1 POSITION control during the remainder
of
this
step.
q.
Set the
CH
1 Input Coupling to
50
n
DC.
r.
Set X10 MAG on.
s.
Turn the HORIZONTAL POSITION control to align
the rising edge of the first displayed signal with the
intersection of the second vertical graticule
and
the center
horizontal graticule lines.
t. Set the pulse generator to produce a 2-ns pulse
when externally triggered.
u.
Increase the duration of the pulse until a stable
display
is
obtained.
v.
CHECK-Width
of the pulse measured at the center
horizontal graticule line is less than 4
ns.
w.
Set X10
MAG
off.
x.
Push
the upper TRIGGER MODE button.
y.
Push
the lower TRIGGER MODE button.
z.
Push
the upper TRIGGER MODE button.
aa.
Disconnect the test equipment from the instrument.
4-31
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