381676A-en-GB_V1.1 08/15
2
Introduction
Thank
you
for
selecting
the
Extech
Model
381676A.
This
instrument
measures
AC/DC
Voltage
and
Current,
Resistance,
Diode,
Continuity,
Logic,
and
includes
a
non
‐
contact
Voltage
Detector
(NCV).
Features
include
MAX
Hold,
Data
Hold,
Automatic
Power
OFF
(APO),
and
Auto/Manual
Range.
This
device
is
shipped
fully
tested
and
calibrated
and,
with
proper
use,
will
provide
years
of
reliable
service.
Please
visit
the
Extech
Instruments
website
(www.extech.com)
to
check
for
the
latest
version
of
this
User
Guide.
Safety
WARNING
:
Improper
use
of
this
device
can
result
in
electric
shock
or
damage
to
the
meter.
Follow
all
safety
guidelines
presented
in
this
manual
and
the
usual
safety
precautions
used
when
working
with
electrical
circuits.
This
instrument
conforms
to
GB/T
13978
‐
92
for
digital
Multimeter
technical
standards,
as
well
as
GB4793.1
‐
1995
(IEC
‐
61010
‐
1:2001)
safety
standards
for
electronic
measuring
instruments
with
a
safety
category
of
CAT
III
600V
and
pollution
degree
2.
Preliminary
Safety
When
using
the
meter,
observe
all
normal
safety
rules
concerning:
Protection
against
the
dangers
of
electrical
current
Protection
of
the
meter
against
misuse
When
the
meter
is
delivered,
check
for
transit
damage.
When
checking
voltage,
always
test
the
meter
on
a
known
live
circuit
first.
Test
leads
must
be
in
good
condition.
Before
use,
verify
that
the
test
lead
insulation
is
intact
and
free
from
lead
wire
exposure
or
other
damage.
Use
only
the
supplied
test
leads.
Safety
during
use
Be
sure
to
set
the
appropriate
function
and
range
before
use
Never
exceed
the
limits
indicated
in
the
specification
table
of
this
manual.
Never
touch
probes,
test
leads,
or
alligator
clip
when
connected
to
live
circuit.
Do
not
measure
voltage
on
terminals
that
exceed
600V
above
earth
ground.
Always
use
caution
when
working
with
voltages
above
60VDC
or
30VACrms.
Keep
fingers
behind
probe
barrier
when
taking
measurements.
Never
connect
test
leads
across
a
voltage
source
while
the
rotary
switch
is
in
the
resistance,
continuity,
or
diode
mode
of
operation.
Never
perform
resistance,
continuity,
or
diode
tests
on
live
circuits.
When
taking
non
‐
contact
voltage
measurements
ensure
that
the
positive
test
lead
is
NOT
exposed
and
that
the
negative
(common)
test
lead
is
not
connected
to
the
bottom
of
the
meter.
Before
changing
functions
using
the
rotary
function
dial,
be
sure
to
disconnect
the
meter’s
test
leads
from
any
circuit
under
test.
Never
use
the
meter
in
an
explosive
environment
or
where
dust,
dirt,
or
steam
exists.
Never
use
the
meter
if
the
housing
or
battery
compartment
is
open.
Do
not
store
meter
in
direct
sunlight,
high
temperature/humidity,
or
condensation.
If
the
equipment
is
used
in
a
manner
not
specified
by
the
manufacturer,
the
protection
provided
by
the
equipment
may
be
impaired.
ALWAYS
discharge
filter
capacitors
in
power
supplies
and
disconnect
the
power
when
making
resistance
or
diode
tests.
www.
GlobalTestSupply
.com
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