LeCroy 9450 - Page 40

Disconnect
the input from CHI
and
connect it
to input of CH2.
Turn off
all the traces except
for CH2.
Set
input
CH2:
-
Coupl:
-
Gain:
-
Var:
-
Offset:
1 MS2, DC
.5 V/div
Gain 1
zero
Set
the
trigger source
to
CH2.
Repeat the
above check procedure for CH2.
Leave the
input
connected
to
CH2,
leave the trace of CH2 on.
Set
trigger
source to
EXT.
Repeat the
above check procedure for EXT trigger,
but
observing the
effect on
CH2.
The tolerance
for the level crossing is
±
4 minor
divisions
for the
EXT trigger
level.
11 Bandwidth
for EXT
Trigger
Set
up a
sine
wave
generator (for
example Marconi 2019A):
-
Frequency
250
MHz
-
Amplitude
2.8 V
p-p
(maximum
for Marconi)
Connect
the output
of the
generator
to
EXT input and
to
CHI using a
coaxial
T-connector.
The
cable length between EXT and CHI must be
short (at
most 2 nsec).
Set up
the
DSO:
Turn off all the
traces except CHI.
Set
the
trigger:
SMART
(COMPLEX) Trigger: OFF
Source:
EXT
Coupl:
DC
Mode:
NORM
Delay 50%
Level
zero
15