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INPUT
TRANSFORMER
MODEL
AM
-2
Figure
111-14_
PHOTO OF
MODEL
AM-2
the
lamp
conducts
to
prevent
the
voltage induced
in
the
secondary
from damaging
the
transformer
or
amplifier
input
circuit_
An
output
cable, made
up
with
connectors,
is
supplied
with each Model
190
manufactured_ When ordering
the
transformer
remember
to
specify which instru-
ment
it
'
is
to
be used with so
that
the
proper
connector
can be provided
at
the
amplifier end
of
the
cable.
When making
up
cables
for
connecting
to
the
input
and
to
the
output,
use BNC
connectors
and
coaxial
cable_
The
coaxial cable should be
short
to
keep
capacitance low, and should be, preferably, low-noise
cable (such
as
Amphenol RG/U
type
21-537
or
type
21-541)_
+1
-I
-10
.01
.---
_
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t 5 .
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s,
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I
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SJ'
",.
'~On..
,
:
0.1
I
I
I
,
,
10
10
100
1000
10k
FREQUENCY
Hz
Figure
111-15
. FREQUENCY RESPONSE
OF
TYPICAL
MODEL
190
TRANSFORMER
111-9
10'
10'
10'
10'
10'
+-1-
-
-\-+---=""'-110-0::::'-""--+--
;""';"
10
1==::::':=-
I-=
I-=;:;;::~:::
E
' 0
10
1
0'
10
'
FREQUENCY
HI
Figure
111-16.
NOISE
FIGURE
CONTOURS FOR
TYPICAL
MODEL
190-113 SYSTEM
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