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LeCroy 9450 Service Manual page 38

Digital oscilloscope
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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

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