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The
Model
177
was
carefully
inspected,
both mechanically
and
electrically,
before shipment.
Upon
receiving
the
instru-
ment,
carefully
unpack
it
from
the shipping carton
and check
for
any
obvious
signs of
physical
damage
that
might have
oc-
curred during shipment. Report
any
damage
to
the shipping
agent
at
once. Retain the
original
packing
materials
in
case
reshipment
becomes
necessary.
The
following
items
are
in-
cluded with every
Model
177 shipment.
1.
Model
177
Micro^'^lt
DMM
2.
Model
177
Instruction
Manual
3.
Additional accessories as ordered.
1.9
SCOPE
OF THE
MODEL
177
INSTRUCTION
MANUAL
This
manual
contains information necessary
to
operate
and
service
both
the
Model
177 and
the optional
Model 1788
Bat-
tery
Pack and
is
divided
into
the following
sections.
1.
Section 2 contains operating
information.
2.
Information
necessary
to
verify
that
instrument
per-
formance
is
within specified
accuracy
is
located
in
Section
3.
3.
Theory
of operation
is
covered
in
Section
4.
4.
Servicing information,
including
Model 1788
installation
instructions,
may
be found
in
Section
5.
5.
Replaceable
parts information,
component
layouts
and
schematic diagrams
are located
in
Section
6.
The Model
177 can be
powered by
tine
voltage
(105-125V
at
50-60HZ
or
210-250V
at
50-60Hz—
standard ranges)
or
the
optional
Model 1788
Rechargeable
Battery Pack. (Optional
line
voltage
ranges
are described
in
Section
2.)
The
Model
1788
is
available factory-installed or
Is
field-installable. Instal-
lation
and
operating
instructions are
given
in
Section
2.
1.10.2
Cables
and Connectors
Model
1681
Clip-On Test
Lead
Set—
This
set
contains
two
1,2m
(48
in.)
leads with
banana
plugs
at
one end and
spring-
action
clip-on
probes
at
the other end.
Model
1683
Universal Test
Lead Kit—
This
kit
contains
two
1m
(40
In.)
test
leads
and
14 screw-ln adapter
tips.
The
tips
consist of
two
alligator tips
with boots, four
banana
plugs,
phone
tips,
two
spade
lugs
and
four
heavy duty
tip
plugs
which
permit connection
of the
Model
177
to
virtually
any
source
within
its
measurement
range.
Model 1600A
High Voltage
Probe—
The
Model
1600A
High Voltage
Probe extends
the
measurable
DC
voltage
range
up
to
40kV.
It
has
a
1000:1
division
ratio,
so
that a
reading of
1
V
on
the
D
M
M
corresponds
to
1
kV
(
1
0OOV)
.
The
Model
1600A
has
a basic
accuracy
of
±25%
and an
input
resistance of
1000MQ.
Model
16S1
50-Ampere
Shunt—
The
Model
1651
50-Ampere Shunt
permits current
measurements
of
up
to
BOA
AC
or
DC. The
shunt has
a resistance of
0.0010± 1%,
so
that a
BOA
current
will
correspond
to a reading of
BOmV
(0.0500V).
Model 1682A
RF Probe-The
Model 1682A
RF
Probe
per-
mits
measurement
of
AC
voltages
at
frequencies
of
20kHz
to
250MHz.
AC
to
DC
transfer
accuracy
is
1dB
at
IV,
and
the
input
voltage
range
is
0.25V
to
15V
rms.
Model
1685
Clamp-On
AC
Current
Probe—
The Model
1685
Clamp-On
Current
Probe
permits
measurement
of
AC
current
by clamping around
a single
conductor,
eliminating
the
need
to interrupt
the current
path.
The Model
1685
has
a
current
conversion
ratio
of
0.1V/A
with three ranges (2A,
20A, 200A). Accuracy
is
+4%
at
60Hz
(±6%
at
50Hz).
1.10.4
Carrying
Case and Rack
Mounts
Model
1684 Carrying
Case—
The
Model 1684
Carrying
Case
is
a
hard
vinyl
case with a
fitted
foam
insert
to help pro-
tect
the
Model
177
from damage.
There
is
also
room
in
the
case
for
the
instruction
manual and
small accessories.
Models
1010
and
1017
Rack Mounting
Kits- The
rack
mounting
kits
permit
mounting one
(1010) or
two
(1017)
Model
177
DMMs
in
a 19 inch rack
for
convenient
viewing.
1.10.5
Output Options
Model
1792
isolated
BCD
Output—
The Model
1792
con-
verts
displayed reading to
an
electrically isolated,
latched
and
buffered
parallel
BCD
format.
Output
data includes
sign,
overrange
and
busy.
It
is
compatible with
Model
177
serial
number
14,500
and
above,
and can be
either
factory or
field
installed.
Installation
of
the
1792
precludes
installation
of
Models 1788
or
1793.
Model
1793 iEEE-488
Output—
The
Model 1793
converts
displayed readings to
iEEE-488
bus
compatible outputs
to
permit
automatic
gathering
of
measurement
data.
Output
in-
cludes
4'/i
digit
ASCII
data, sign
an
overrange.
It
operates
In
either talk-only
or
addressable
modes. The Model 1793
is
compatible with
Model
177s
serial
number
16,500
and
above,
and can be
either
factory or
field installed.
Installation
of
the
1793
precludes
installation
of the
Model 1788
or 1792.
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