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1.1
rNTRODUCTION
The
Keithley
Mode!
177
Microvolt
DMM
Is
a
versatile,
highly
sensitive
digital
multimeter
which
is
used
for
measurement
of
DC
and
AC
voltages,
DC
and
AC
currents,
as
well
as
resistance.
For
a complete
summary
of
ranges
for
each
of
these
five
functions,
refer
to the specifications at
the
front of
this
manual.
Ranges and
functions are
easily
selected
with
front
panel
pushbuttons,
while
connections
for
all
functions
are
easily
made
with a
single set
of front
panel Input
ter-
minals.
1.2
MODEL
177
FEATURES
1.
4V2
Digit
LED
Display—
An
easy
to read
4H
digit
display
shows
20,000 counts
of
information with
automatic
polari-
ty
indication.
2.
VV/1mfi
Resolution—
The Model
177
is
capable
of
reading
DC
voltages as
low
as
l/xV
and
resistances
down
to 1mfl.
3.
Front Panel
Zero—
The
front
panel zero control
may
be
used
to
compensate
for
thermal
offsets or lead resistance
when
making measurements.
4.
Analog
Output—
An
analog output of IV/ 10,000
counts
is
available
on
the
rear panel.
1.3
WARRANTY
INFORMATION
Warranty
information
may
be found
inside
the front
cover
of
this
manual. Should
it
become
necessary
to
use
the warran-
ty,
contact your nearest
Keithley representative
or the factory
to
determine the
correct
course
of action. Keithley
Instru-
ments
maintains
service
facilities in
the United
States,
West
Germany,
Great
Britain,
France,
the
Netherlands,
Switzerland
and
Austria.
Information
concerning the
appli-
cation,
operation or
service of
your instrument
may
be
directed to
the
applications
engineer
at
any
of these
loca-
tions.
Check
inside
the
front
cover
of
this
manual
for
ad-
dresses.
1.4
MANUAL ADDENDA
Information
concerning improvements
or
changes
to the
instrument
that
occur
after
the
printing
of
this
manual
will
be
covered
in
an
addendum
sheet
packed
with the instrument.
Be
sure to review these
changes
before attempting to operate
or service
the instrument.
1.5
SAFETY
SYMBOLS AND TERMS
The
following safety
symbols and terms
are
used
in
this
manual
or
may
be found on
the
Model
177.
The
symbol
on
the instrument
indicates that
the user
should
refer
to the
operating
instructions.
The symbol
y^^n
the instrument denotes
that
a
potential
of
1000V
or
more
may
be found
present
on
the
terminals.
Standard
safety practice
should be observed
when
such
dangerous
voltages are
encountered.
The
WARNING
heading
used
In
this
manual
explains
dangers
that
could
result
In
personal
injury
or
death
if
not
handled
properly.
Be
sure to read the
WARNING
informa-
tion carefully
before
performing the
associated procedure.
The
CAUTION
heading
is
used
in
this
manual
explains
hazards
that
could
damage
the instrument.
1.6
SAFETY PRECAUTIONS
The
following safety precautions
should be observed before
operating
any
digital
multimeter.
1
.
This instrument
is
intended
for
use
by
qualified
personnel
who
recognize
shock
hazards and
are
familiar
with the
safety
precautions required
to avoid possible
injury.
Read
over the
manual
carefully
before operating
this
instrument.
2.
Exercise
extreme
caution
when
a
shock
hazard
is
present
at
the
instrument's
input.
The
American
National
Standards
Institute
(ANSI)
states that
a
shock
hazard
ex-
ists
when
voltage
levels
greater
than
30V
rms
or
42.4V
peak
are present.
A
good
safety practice
is
to
expect
that
hazardous
voltage
is
present
in
any
unknown
circuit
before
measuring.
3.
Inspect
the
test
leads
for
possible
wear, cracks
or
breaks
before
each
use.
If
any
defects
are
found,
replace
with
test
leads that
have
the
same
measure
of safety as those sup-
plied
with the instrument.
4.
For
optimum
safety
do
not touch
the
test
leads
of
the
instrument while
power
is
applied
to
the
circuit
under
test.
Turn
the
power
off
and
discharge
ail
capacitors,
before
connecting
or
disconnecting the
instrument.
5.
Do
not
touch any
object
which
could provide a
current
path
to
the
common
side of
the
circuit
under
test
or
power
line
(earth)
ground.
Always
make
measurements
with dry
hands
while standing
on
a
dry, insulated surface,
which
is
capable
of
withstanding the voltage being measured.
6.
Exercise
extreme
precaution
when
testing
high
energy
power
circuits
{AC
line
or mains,
etc.).
Refer
to
the oper-
ation section of
the
manual.
7.
Do
not
exceed
the instrument's
maximum
allowable input
as defined
in
the specifications
and
operation
section.
1.7
SPECIFICATIONS
Detailed
Model
177
specifications are located at
the
front
of
this
manual.
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