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HP AR - Operation

HP AR
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output
must
be
kept
away
from
the
input
to
avoid
the
possibility
of
feedback.
2-4
OPERATION
The
input
circuit
of
the
Model
460AR
is
a
terminated
transmission
line
with
a
characteristic
impedance
of
200
ohms.
The
output
circuit
has
an
impedance
of
280
ohms
(resistive).
The
load
impedance
determines
the
gain
of
the
amplifier.
Therefore.
it
is
not
neces
sary
to
match
the
load
to
the
output
of
the
amplifier
unless
the
gain
is
adversely
affected.
Shown
below
are
two
dia-
grams
for
connecting
a
matched
or
unmatched
load
to
the
Model
460AR
using
a
200
ohm
cable.
Connect
acros
s
output
Jack
inside
instrument
200
ohms
load
,-,
4'-----+/-'
.-0--'
-----,
Model
460AR
OUTPUT
~~~----'
-L"""
200
ohm
cable
<
,
, \
•
j
,
,
620
To
any
ohms
load
Model
460AR
OUTPUT
200
ohm
cable
The
GAIN
control
will
vary
the
gain
of
the
amplifier
over
a
range
of
approximately
6
db.
This
control
is
provided
so
that
the
gain
of
the
amplifier
can
be
set
to
a
known
value
if
nec-es
sary.
There
is
no
feedback
in
the
amplifier.
so
the
gain
is
directly
proportional
to
the
Gm
of
the
tubes.
The
gain
is
also
determined
by
the
output
load
and
will
vary
with
output
load
in
accordance
with
the
relation
280
X
ZL
280
+
ZL
The
Wide
Band
Amplifier
can
be
used
with
the
<$Model
410
Vacu-
um
Tube
Voltmeter
to
provide
additional
sensitivity
in
measuring
high
frequencies.
A
special
adaptor
is
available
to
connect
the
probe
of
the
Model
410
to
the
output
terminal
of
the
amplifier.
The
overall
frequency
response
of
the
Model
460AR.
in
combina-
tion
with
the
Model
410.
is
within
1
db
out
to
190
me.
This
combi-
nation
will
give
a
full
scale
meter
reading
on
the
Model
410
with
1/10
volt
applied
to
the
input
of
the
Model
460AR.
-4-

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