LeCroy 9450 - Page 39

Adjust the sine wave
generator's
output
amplitude
to
get 8
divisions
p-p,
corresponding
to
a
2
V amplitude.
It
is
important
that
the offset
of the input is
set to zero
(use Panel
Status
to verify).
Use the
offset adjustment
of the sine
wave
generator
to
center the
signal
with
respect
to
the
screen.
Later,
the
test on
the EXT
trigger
level
requires that the signal
has an
absolute
range
of
±
2
V.
Check:
-
the sine
wave must
pass through
the
horizontal
center
of the
screen
(502
pretrigger line)
at
the
vertical
position
zero
(vertical
center)
within
±
3
minor
divisions
Repeat
for the following
conditions:
-
trigger
slope POS and
NEG (verify
slope
at check
point)
-
trigger
coupling
DC and HFRej
Set the
trigger level
to
+
1.5
V.
Check:
-
the sine
wave
must
pass
the
horizontal
center
at +
3 divisions
within
±
3
minor
divisions
Repeat for
the
following
conditions:
-
trigger
slope POS
and
NEG
(verify
slope
at check
point)
-
trigger
coupling
DC and
HFRej
Set
the
trigger
level
to
-
1.5
V.
Check:
-
the
sine
wave
must
pass the
horizontal
center
at
-
3 divisions
within
±
3 minor
divisions
Repeat
for
the following
conditions:
-
trigger
slope POS
and
NEG
(verify
slope
at check
point)
-
trigger
coupling
DC and
HFRej
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