LeCroy 9450 - Page 27

Repeat the test for Tirae/div
=
5 msec/div,
2
msec/div, 1
msec/div,
and
.5 msec/div and check
as above.
Test
of the ADCs
This is
to
verify
proper
operation
of the
ADCs
at
the
four
nominal
sampling frequencies:
400, 200,
100,
and
40
Ms/sec.
With
both Channel 1 and Channel
2
inputs open,
set
the DS0
as
follows:
-
turn on the CHI
trace
-
Grid single
-
Input couplings CHI and
CH2: 1
MQ
DC
-
Input gain
50
mV/div
-
Trigger:
SMART (COMPLEX) Trigger:
OFF
Source
: LINE
Coupling:
AC
Mode
:
NORM
-
Time/div
=
10,
20, 50,
100
psec/div
For
each of the
four time
bases
above,
check
for CHI
and CH2:
-
displayed waveform
should
lie
within
a
band
of
less than
3
minor
divisions
-
Using the
offset
control
move
the
trace for
CHI and
CH2
slowly
through
the entire
range
and
check
that
there
is no
significant
change in
the
displayed
trace.
Repeat for
channel 2.
Offset
Set
the
DS0
as
follows:
-
turn on
the trace
for CHI
-
Grid
single
-
Input
set to
GND
-
Input gain 5 mV/div,
offset zero
-
Trigger:
SMART
(COMPLEX)
Trigger:
OFF
Source:
LINE
Coupling:
AC
Mode:
NORM
-
Time/div
=
50
psec/div
-
BWL
OFF