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30.-------------,--------------,-------------,---------------
Recovery
Time
=
time
required
for
the
output
to
settle
to
within
1
volt
of
steady
state
value.
25~--------------~--------------_r--------------~
Overload
~
sufficient
input
to
saturate
the
output
stage
of
the
first
amplifier.
20
-:
(.)
Data
taken
with
the
input
coupling
switch
in
the
dc
position.
In
the
ac
coupling
position,
a
0.1
J.lF
capacitor
in'
series
with
a
100
megohm
resistor
is
added
(RC
~
10
seconds).
ILl
(/)
GAIN
X 2K - X
10
Minimum
Recovery
Time
is
available
when
the
input
coupling
is
dc
and
the
Low
Frequency
Rolloff
switch
set
at
dc.
ILl
15
::f
t=
>-
a::
ILl
>
8
ILl
a::
10
5
The
OV
L
pushbutton
provides
immediate
recovery
in
all
modes.
Absolute
Maximum
I
nput
Voltage
(differ·
ential
or
common
mode):
ac
coupling
~
115
V,
60
Hz
dc
coupling
~
±20
V
.01
.03
0.1
0.3
1.0
LOW
FREQUENCY
ROLL-OFF
SETTING
(Hz)
Figure
111-2.
TYPICAL
RECOVERY
TIME
VS LOW FREQUENCY
ROLLOFF
3.6 OVERLOAD FAST RECOVERY
If
the
input
signal
exceeds
the
level
indicated
in
the
specifications
(Section
I).
the
amplifier
will
saturate
and
remain
disabled
until
coupling
and
filter
capacitors
dis·
charge
(see
the
recovery
time
data,
Figure
111-2).
Pressing
the
spring·loaded
overload
recovery
toggle causes fast
discharge
of
the
capacitors
so
that
normal
operation
can
be
resumed
immediately.
3.7 LOW-PASS/HIGH-PASS FILTERS
Series
low·pass
and
high·pass filters are
incorporated
to
provide
bandpass
characteristics.
Minimizing
the
bandwidth
minimizes
the
source
thermal
noise. In
addition,
the
filters
can
be
used
to
eliminate
unwanted
signals (such as
dc,
high
frequency,
or
60 Hz
pickup).
The
following figures are
normalized
amplitude
and phase
transfer
characteristics.
If
one
or
both
Coupling
switches
are
set
to
the
AC
Coupling
position,
the
LF
ROLLOFF
switch
should
not
be
left
in
the
DC p.osition. If
it
is
left
in
the
DC
position,
output
voltage
111-3
offsets
resulting
from
the
input
offset
current
(100
pA
max)
may
occur.
At
high gains,
the
offset
could
exceed
full
scale.
3.8 SINGLE-ENDED/DIFFERENTIAL
OPERATION
The
amplifier
may
be
operated
differentially
or
single·
ended.
For
single·ended
operation,
simply
place
the
unused
input
coupling
switch
to
the
ground
position,
and
place
the
signal·input
switch
to
ac
or
de
coupling
as
desired.
For
differential
operation,
place
both
coupling
switches
in
ac
or
dc
positions
or
one
in
dc
and
the
other
in ac,
as
appropriate.
The
output
voltage
is
equal
to
the
gain
times
the
difference
of
the
voltages
at
the
A and B
inputs.
Remember
that
the
two
signal
grounds
(tied
together
internally)
are
connected
to
chassis
ground
through
a 10
ohm
resistor.
For
maximum
ground-loop
rejection,
avoid
shorting
the
signal
ground
to
chassis
ground.
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