LeCroy 9450 - Page 44

Set
the time base:
-
Time/div
5
nsec/div
-
Interleaved
ON
Apply sine
wave signal
3
V
p-p
of
100 MHz
to CHI. Turn
to
INTERVAL
Width > and adjust
width
to
25
nsec.
Check:
-
100
MHz:
Width
>
25
nsec,
scope
should NOT
trigger
-
44
MHz: Width >
25
nsec,
scope
should NOT trigger
-
37
MHz: Width >
25
nsec,
scope
should trigger
Set
the
frequency
to
40 MHz
and INTERVAL
Width
to > 27.5 nsec.
Check:
-
40 MHz:
Width >
27.5
nsec,
scope
should NOT trigger
-
33
MHz: Width >
27.5
nsec,
scope
should
trigger
Repeat the
above
test
for CH2.
13 Time Base
Accuracy
In order
to
verify
the
time
base, use a
sine
wave generator of 1 MHz
with
a
frequency accuracy of
better than
10
ppm
(for example
Marconi 2019A).
Set up
the DS0:
Turn off all
the traces
except CHI.
Set the
trigger:
-
SMART (COMPLEX)
Trigger
OFF
-
Source
CHI
-
Coupl
DC
-
Mode
NORM
-
Slope +
-
Delay
0%
-
Level zero
19