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CALIBRATION
NOTES
8.
(CONT)
e.
Check INPUT
crosstalk:
<2.5%
Set
the
plug-in
scope
TRIGGERING
LEVEL
cw and
adjust
TYPE
106
for
4cm
of
amplitude
with
INPUT
ATTEN
and MILLIVOLTS/CM
each
set
to l.
With
DISPLAY
in
A-Vc,
change
A
INPUT
to GND
and
check
for
a display
of
<lmm
as
display
is
positioned
over
the
graticule.
Change
DISPLAY
to Vce-B,
reverse
settings
of A and
B INPUT
switches
and
repeat
the
check
for <lmm
of display.
Remove
the
TYPE
106
signal
setup.
9.
BANDWIDTH
a.
setup
Connect
TYPE
191
OUTPUT--GR
to
BNC
Adapter--502
cable--10:1
attenuator--
502
termination--A
INPUT.
Set
the
TYPE
W
controls
as
follows:
DISPLAY
A-Vc
INPUT
ATTEN.
1
MILLIVOLTS /CM
50
A INPUT
DC
B
INPUT
GND
b.
Check amplifier bandwidth:
>26MHz
@-3dB
Adjust
TYPE
191
for
a 4cm
display
of
50kHz
centered
on
the
graticule.
In-
crease
the
frequency
of TYPE
191
until
the
display
is
reduced
to
2.8cm
and
check
frequency
of
TYPE
191
for >26MHz.
Change
the
DISPLAY
to Vc-B,-move
signal
setup
to
INPUT
B and
repeat
the
step.
ce.
Check
MILLIVOLTS/CM
bandwidth
Check
the remaining
positions
of the
MILLIVOLTS/CM
switch
in both A and
B
INPUT
as
in
the
table
below:
MILLIVOLTS
/CM
Bandwidth
20
24MHz
10
21MHz
5
18MHz
2
14MHz
1
8MHz
Remove
the
TYPE
191
signal
setup.
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