LeCroy 9450 - Page 38

Check:
-
the
frequency of the
SG
503
must
be at least 200 MHz
Repeat
the above
for CHI
and CH2
for input
Volts/div
=
50
mV,
20 mV,
10
mV, and 5
mV.
Set
the
bandwidth
limiter ON.
Repeat
the same test as
for
bandwidth limiter
OFF.
Check:
-
the
frequency
of the SG 503
at the
3
dB point must
be
75 MHz
±
20
%
10
Trigger
Level for DC
and HFRej
Set up
any
sine wave generator,
capable of generating sine waves
to
500 Hz,
for example
Intron IFG-422
or Topward TFG-8101:
-
frequency
500
Hz
Connect
the output
of the
generator
to
EXT input and
to
CHI via
a
coaxial
T-connector.
The
cable length from EXT
to
CHI
must
be
short,
at
most
2 nsec.
Set up
the
DS0:
Turn off
all the traces except CHI.
Set
the trigger:
SMART
(COMPLEX)
Trigger:
OFF
Source:
CHI
Coupl:
Mode:
Delay
:
Level
DC
NORM
50%
Pretrigger
zero
Set
the
input CHI:
-
Coupl:
-
Gain:
-
Var:
-
Offset:
1 MS,
DC
.5 V/div
Gain
1
zero
Set
the
time base:
-
Time/div:
.2
msec/div
13