Extech
Instruments
19 GX900-EU-EN V1.6 4/14
AC
CURRENT
MEASUREMENTS
CAUTION:
Do
not
make
20A
current
measurements
for
longer
than
30
seconds.
Exceeding
30
seconds
may
cause
damage
to
the
meter
and/or
the
test
leads.
1.
Insert
the
black
test
lead
banana
plug
into
the
negative
COM
jack.
2.
For
current
measurements
up
to
5000µA
AC,
set
the
function
switch
to
the
µA
position
and
insert
the
red
test
lead
banana
plug
into
the
µA/mA
jack.
Press
the
F1
key
(MENU)
and
select
uAAC,
Press
the
OK
key.
3.
For
current
measurements
up
to
500mA
AC,
set
the
function
switch
to
the
mA
position
and
insert
the
red
test
lead
banana
plug
into
the
µA/mA
jack.
Press
the
F1
key
(MENU)
and
select
mAAC,
Press
the
OK
key.
4.
For
current
measurements
up
to
10A
AC,
set
the
function
switch
to
the
10A
position
and
insert
the
red
test
lead
banana
plug
into
the
10A
jack.
Press
the
F1
key
(MENU)
and
select
AAC,
Press
the
OK
key.
5.
Press
the
key
labeled
MENU,
move
the
menu
selector
to
the
item
labeled
AC,
and
then
press
the
OK
key
6.
Remove
power
from
the
circuit
under
test,
then
open
up
the
circuit
at
the
point
where
current
is
to
be
measured.
7.
Touch
the
black
test
probe
tip
to
the
neutral
side
of
the
circuit.
Touch
the
red
test
probe
tip
to
the
“hot”
side
of
the
circuit.
8.
Apply
power
to
the
circuit.
9.
Read
the
current
in
the
display.
