LeCroy 9450 - Page 36

Set
the
trigger:
SMART
(COMPLEX)
Source:
Coupl:
Mode:
Delay
:
Level
:
Set input
CHI:
Coupl:
Gain:
Var
Gain:
Offset:
Trigger:
OFF
CHI
HF
NORM
zero
zero
50
Q
lV/div
1
zero
Set the
time
base:
-Time/div
.5 ysec/div
-Interleaved
ON
Bandwidth
limit:
OFF
Adjust
the
generator
output
amplitude
and
CHI
offset
to
get
a 5
division
p-p
sine
wave,
or
maximum
possible
from
the
generator
for
the
large
V/div
gains
(Marconi
2.8
V
p-p
maximum).
Increase
the
generator
frequency,
while
decreasing
the
Time/div
until
the
sine
wave
p-p
amplitude
is
.7*5
divisions
=3.5
divisions
(3
dB
point),
or
70% of the
initial
amplitude
at .5
MHz.
Check:
-
the
frequency
of the
generator
must
be
at
least
350
MHz
Repeat
the
above
for
CHI
and
CH2
for
input
Volts/div =
.5
V,
.2
V,
.IV,
50
mV,
20mV,
10 mV,
5 mV.
Set the
bandwidth
limiter
ON.
Repeat
the
same
test
as for
the
bandwidth
limiter
OFF.
Check:
-
the
frequency
of
the
generator
at the
3 dB
point
must
be
70 MHz
±
20%
11