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NODEI. 615
ACCESSORIES
Model 399 Isolat
Description:
The Model 399 is a unity-gain
a
lifier
that
provides
input
isolation
greater
than 10 'f!: ohms.
It
is useable
for conrmon mode input
voltages
up to 1500
volte
peak,
dc or ac.
Application:
The 399 can be used for
"FIFO"
operation
where both input
and output
must be floated.
IC can
also
be used to break
ground
loops within
a system.
The 399 output
will
drive
recorders
up to 1 mA.
When
used with
the Model 615,
the electrometer
can be float-
ed up to
100 volts
while
driving
a Model 370 recorder
up to 100 volts
off
ground.
:ing Amplifier
Specifications:
(condensed)
CAIN:
Xl,
adjustable
) 3%.
GAIN ACCURACY:
& 0.2%
(as set at factory).
CAIN LINEARITY:
Within
3 mV for
signal
levels
below 1".
FREQURKY RESPONSE: Fast:
dc co IOOHZ; Slow: dc to
0.3&z
(-3
d* response).
1NP"T RESISTANCE:
106
ohms.
FULL SCALE INPUT:
+ 1 volt
with
100% overrange.
MAXIMUM INPUT OVERLOAD: 100 vole
INPUT ISOLATION:
Greater
than 10 720 ohma at 50% relative
humidity
and 25 C shunted
by less
than
100 pF.
MAXIl$M
COMMON MODE VOLTAGE:
1500 volts
peak,
dc or ac.
OUTPUT ISOLATION:
Greater
than lo8 ohms shunted
by
Less than 0.001
microfarad.
POWER: 105-125 or 210-250
volts
(switch
selected),
50-60
Hz,
5 watts.
Model 370
~escriprion:
The 370 is a compact,
paper chart
re-
corder
which
is compatible
with
most Keirhley
instru-
ments having
a 1 mA output.
Applications:
The 370 can be
used
directly
with
the
Model615
up to 100
volts
off
ground.
The Model 3701
cable
supplied
can be used for convenient
connections
co the instrument.
0372
55
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