OPERATING INSTRUCTIONS
b.
For
best results
with fl
o
a
t
i
n
g
o
p
e
r
a
t
i
o
n
,
follow the steps below:
1.
Remove
the
sh
o
r
t
ing
link
from
the
LO
or
GND
Post
on
the rear
p
a
n
e
l
.
MODEL 153
2.
Connect
the
unknown s
o
u
r
c
e
to
t
h
e
Model
153, connecting the
lowest im
p
e
d
a
n
c
e
point
to
the
input
low.
Operate
as
described
in
p
a
r
a
g
r
a
p
h
2-4.
Do
not
ground any re
corders used
with
this
operation, since
the
low of the Model 153
output
is
n
o longer
gr
ou
n
d
e
d
.
3.
Use
triaxial
cable
and
c
o
n
n
e
c
t
o
r
s
for floating o
p
e
r
a
ti
o
n
.
A
c
o
mpl
e
t
e
outer shielc
pr
o
t
ects the operator.
4.
Make
sure the
chassis
is
grounded.
Use the
G
Post
on
the rear panel
o
r
the
grounc
pin
o
f
the power
c
ord
.
2-7.
RECORDER
OUTPUT.
B.
Mod�l
153
output
for
full-scale
meter
deflection
on
any
range
is adjustable from
0
to
il.OS
volts
at
up
to 1
milliampere.
Output polarity is
p
o
si
t
i
v
e
.
Output resistance
is
less
than
10
o
h
m
s
with
the
DC
OUTPUT
ADJ
Control
s
e
t
for
maximum
ou
t
p
u
t
;
resistance vari
with
the Control
s
e
t
t
i
n
g
to
7.5
kilohms
maximum.
If
the
Model 153
is
used
for
f
l
o
a
t
i
n
g
measurements,
do
not
g
r
o
u
n
d
the
r
e
c
o
r
d
e
r
connected to the
output.
b.
When
r
e
c
o
r
d
i
n
g
with the Model
153
use
t
h
e
Keithley
Mo
d
e
l
370
R
e
co
r
d
e
r
.
The output
of
the Model
153
is
sufficient
to
drive
the
Mo
d
e
l
370
w
i
t
h
o
u
t the
use
of
any
r
e
c
o
r
d
e
r
preamplifiers.
The Model 370
allows
maximum
c
a
p
a
b
i l
i
t
y
of
the
Model
1
5
3
.
It
has
1%
line
arity,
10
chart speeds and c
a
n
float up
to
ISOO
volts
off ground.
Using
t
h
e
Model
370
with
t
h
e
Model 153 avoids interface
problems which
may
be
encountered between a m
e
a
s
uri
n
g
instrument and
a
recorder.
c.
To u
s
e
the Model
3
7
0
with
the
Mode l 153 conne ct the high and l ow binding
posts
on
t
h
e
Model 153 rear
p
a
n
e
l
to the
same posts on the Model
370.
Do
not
ground the Mode l
370
1f differential measurements
ar
e
being made.
Adjust the easily accessible Calibration
Control on
the
Model
370
for full-scale
recorder deflection.
2-8.
INPUT CONNECTIONS.
a.
The
Model
153
INPUT
Receptacle
is a triaxial
type;
its mating co
nn
e
c
t
or
is
the
Keithley Mode l 1533.
For input
leads
to the Model 153,
Keithley
Instruments, Inc. ,
has
the
Model 1534
Special
Low-Thermal
Triax
cable which can be conne cted directly to the
Mode l 1533 Connector.
The Connector
is
made to accommodate
the 0.145-inch
o
u
te
r
diam�ter
of
the
Cable.
b.
For best connections to the input, use the acc
e
s
s
o
r
y
p
r
o
b
e
s and
l
e
a
d
s
describe d
in
S
e
c
t
i
on
7.
This w
i
l
l
enable
the
Model
153
to
be
used under the best conditions.
Other
considerations
for
making
sure the Model
153
is pro
p
e
r
l
y connected are listed
in
the
following
paragraphs.
c.
carefull y shield the input connection
and
the source
b
e
i
n
g
measured.
Unless
the
shielding
is
thorough,
any
alteration
in
the
electrostatic
field near the
input
circuitry
will c
a
u
s
e
definite meter disturbances.
8
Summary of Contents for 153
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