MA44x
‐
en
‐
GB_V1.0
8/16
2
Introduction
Thank
you
for
selecting
the
Extech
EX44x
Series
400A
Clamp
Meter.
The
MA440
is
a
400A
AC
Clamp
meter
with
a
total
of
9
functions.
The
MA443
is
a
400A
True
RMS
AC
Clamp
meter
that
offers
10
functions
including
TRMS
AC
measurements
and
Type
K
Thermocouple
The
MA445
is
a
400A
AC/DC
True
RMS
Clamp
meter
with
11
functions
including
DC
Current,
TRMS
AC
measurements,
and
Type
K
Thermocouple.
The
MA44x
series
are
hand
‐
held,
4000
count
clamp
meters.
This
meter
series
measures
AC/DC
voltage,
AC
current,
DC
current
(MA445),
resistance,
diode,
continuity,
capacitance,
temperature
(MA443
and
MA445),
frequency,
and
duty
cycle.
In
addition,
these
meters
offer
Display
hold,
MIN
‐
MAX
(MA443
and
MA445),
Relative
mode,
NCV
(non
‐
contact
voltage
detection),
and
automatic
power
OFF.
In
addition
to
the
meter,
the
packaging
includes
Instructional
documentation
(Quick
Start),
Test
Leads,
K
‐
type
temperature
probe
(MA443
and
MA445),
batteries,
and
a
pouch.
This
device
is
shipped
fully
tested
and
calibrated
and,
with
proper
use,
will
provide
years
of
reliable
service.
Please
visit
our
website
(www.extech.com)
to
check
for
the
latest
version
of
this
User
Guide,
Product
Updates,
Product
Registration,
and
Customer
Support.
Safety
To
ensure
the
safe
operation
and
service
of
the
meter,
follow
these
instructions
closely.
Failure
to
observe
warnings
can
result
in
severe
personal
injury
or
death.
These
instruments
are
designed
and
produced
in
strict
accordance
with
IEC/EN61010
‐
1,
IEC/EN
61010
‐
2
‐
032,
and
IEC/EN
61010
‐
2
‐
033,
safety
standards,
and
comply
with
the
safety
standard
for
double
insulation,
overvoltage
CAT
III
600V
and
pollution
level
2.
Please
observe
all
operational
and
safety
instructions
otherwise
the
protection
provided
by
instrument
may
be
compromised.
These
instruments
conform
to
UL
standard
61010
‐
1,
61010
‐
2
‐
032,
61010
‐
2
‐
033;
these
instruments
are
certified
to
CSA
standard
C22.2
no.
61010
‐
1,
IEC
standard
61010
‐
2
‐
032,
and
IEC
standard
61010
‐
2
‐
033.
CAT
III:
Applicable
to
test
and
measuring
circuits
connected
to
the
distribution
section
of
a
building’s
low
voltage
mains
installation;
before
use
of
these
instruments
please
observe
and
obey
all
safety
instructions.
