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(3)
operator may be better able
to
safely carry out
electrical
monitoring
of experimental animals, not
only
where the input
amplifier
is the Model
113,
but where
other
preamplifiers are used as well.
(1)
Turn-On Transients
When the
amplifier
is first turned on, all cir-
cuits
do not instantly assume
their
quiescent
operating state. Instead, a
finite
time
is
re-
quired for the common-mode loop amplifier
to
set the input stages
to
their proper operat-
ing point. During
this
interval (which varies
from a few
milliseconds
to
a second
or
more
depending on the source impedance), the
source-gate
junction
of
one input transistor
or
the
other
is forward-biased.
In
this
state,
the
transistor
does not
exhibit
a high im-
pedance, but instead appears as a low im-
pedance from the input
of
the instrument
to
the
output
of
the common-mode amplifier.
(2)
Power Transformer
The power transformer in the Model
113
is
of
very high quality and is unlikely to fail during
the
life
of
the instrument. Nevertheless, the
possibility
of
such a failure, however remote,
must
be considered. Should a short develop,
and
if
the
instrument were being used
with
in-
complete
or
improper ground returns (com-
mon in many
buildings
and installations), a
dangerous situation would exist.
(3)
Internal Component Failure
The input transistors
of
the Model
113
are
junction-type
field-effect
transistors.
Al-
though they
exhibit
an
extremely high input
resistance when properly biased,
their
resis-
tance can drop
to
a few
ohms
if
their
operat-
ing current or bias is
out
of
the normal operat-
ing range
sufficiently
to
give a simple forward
biased diode
junction
from the gate
to
either
the source or the drain. There are several
possible internal component failures which,
though unlikely, could bring about
this
condi-
tion. Should
it
occur, the input
of
the ampli-
fier
would be connected through a low im-
pedance
directly
to
the
instrument's
power
supply.
(4)
Excessive Common-Mode Input
As stated in the specifications, the common-
mode input
limit
of
the Model 113 is 1 V rms.
Higher levels
"turn
on"
low
conduction
paths
at the input
of
the preamplifier to protect the
input circuits, and thereby lower the
input
im-
pedance.
Again, it should be emphasized that, even though
EG&G Princeton Applied Research Corporation
does
not recommend the Model
113
for use
with
human subjects,
its
use in all other
applications
is
recommended
without
reservation.
G. VENTILATION
With a power consumption
of
only 5 watts when
operated from the ac line, and even less when bat-
tery operated, the Model 113 does not have any
special
ventilation
requirements. It can be
operated on a bench or
in
a rack (rack
mounting
kits can
be
purchased from the factory), the only
constraint being that the ambient temperature
be
in the range of 15°C to
45
°C.
H.
DEFECTS AND ABNORMAL
STRESSES
Whenever it is likely that the protection provided
by the connection
to
earth ground has been im-
paired, the apparatus shall be made inoperative
and secured against any unintended operation.
The protection is likely
to
be impaired if, for exam-
ple, the apparatus:
(1)
Shows visible damage,
(2)
Fails
to
perform the intended measurements,
(3)
Has been subjected
to
prolonged storage
under unfavorable conditions,
(4)
Has been subjected
to
severe transport
stresses.
Such apparatus should not be used until
its
safety
has been verified by qualified service personnel.
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