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I
NOLLOHS
SECTION
I
CHARACTERISTICS
1.1
INTRODUCTION
The Model 113 Low-Noise Preamplifier provides high gain,
low
noise
amplification
of
wideband signals
from
dc
to
300
kHz. Adjustable high and
low
frequency
rolloffs
allow the
bandwidth
to
be
reduced.
Two
inputs,
with
individual
coupling switches,
allow
either
differential
or
single-ended
operation. Calibrated gain
is
switch selectable
from
x10
to
X104
in a 1·2-5 sequence, and
an
uncalibrated gain vernier
provides
x1
to
x2.5 range expansion.
The
unit
may
be
powered either
from
the
ac
line
or
from
its
own batteries. The nickel-cadmium batteries recharge
automatically
during line operation.
Other features include
an
overload fast-recovery switch,
special
circuitry
that
reduces the effects
of
ground-loop
currents, front-panel
dc
zeroing and common mode rejec-
tion
screwdriver controls,
and
battery
test provisions.
The Model 113
is
well suited
for
use
as
a preamplifier
for
other Princeton
Applied
Research signal processing instru-
ments.
1.2 SPECIFICATIONS
(1) INPUTS
Two
channels,
each
with
a three position switch
to
provide
for
ac
or
dc coupled, single-ended
or
differen-
tial operation. I
nput
connectors
are
BNC
type
.
/
\-1
(2)
INPUT
IMPEDANCE
(a)
Ac
coupled: through
0.1
J.1F,
shunted
to
ground
with
100 megohms and 15 pF in parallel.
(b) Dc coupled: 1 gigohm, shunted
by
15
pF.
(3)
MAXIMUM
INPUT
WITHOUT
DAMAGE
(a)
Dc coupled: Common-Mode,
±10
V;
Differen-
tial, ±7.5
V.
(b)
Ac
coupled: coupling capacitors can
withstand
200
V. Transients
which
pass
through coupling
capacitors cannot exceed dc coupled operation
limits.
(4)
MAXIMUM
INPUT
SIGNAL
CONSISTENT
WITH
LINEAR
OPERATION
(see
Subsection 3.10)
(a)
Common
mode: 1 V rms.
(b)
Differential
mode (gains
of
10
to
100):
±500
mY.
(c)
Differential
mode (gains
of
200
through 10
k):
±50
mY.
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