MA44x
‐
en
‐
GB_V1.0
8/16
10
AC
and
DC
Voltage
Measurements
WARNING:
Do
not
apply
>
600VAC/DC
between
the
meter
terminals
and
ground
.
CAUTION:
When
connecting
the
test
leads
to
the
circuit
or
device
under
test,
connect
the
black
lead
before
the
red
lead;
when
removing
the
test
leads,
remove
the
red
lead
before
the
black
lead.
1.
Set
the
function
select
switch
to
the
Voltage
position
.
2.
Use
the
M
(Mode)
button
to
select
AC
or
DC
Voltage.
3.
Insert
the
black
test
lead
banana
plug
into
the
negative
(COM)
jack
and
the
red
test
lead
banana
plug
into
the
positive
(V)
jack.
4.
Touch
the
test
probe
tips
to
the
circuit
or
under
test.
For
DC
measurements
in
the
range
of
400mV,
use
the
Relative
mode
to
zero
the
display
before
taking
a
measurement.
5.
Read
the
voltage
in
the
LCD.
The
display
will
indicate
the
proper
decimal
point
and
value.
6.
Relative
(REL)
mode
can
be
used
to
set
a
reference
reading
from
which
subsequent
readings
will
be
offset
(
reference
reading
–
actual
reading
=
displayed
reading
).
Long
press
the
REL
button
to
activate/deactivate
the
relative
mode.
7.
The
MA440
can
display
the
frequency
(Hz)
or
duty
cycle
(%)
of
the
measured
voltage.
Short
press
the
Hz
%
button
to
toggle
frequency
and
duty
cycle
readings.
For
the
MA443/MA445
see
the
dedication
section
on
Frequency
for
frequency
and
duty
cycle.
8.
The
MA443
and
MA445
record
MAX
and
MIN
readings.
Short
press
the
MAX
MIN
button
to
step
through
the
MAX
MIN
readings.
Long
press
the
MAX
MIN
button
to
exit.
9.
Short
press
the
H
button
to
freeze/unfreeze
the
displayed
reading.
Long
press
to
activate/deactivate
the
display
backlight.
NOTES:
The
MA440
displays
OL
when
the
input
exceeds
1000V.
The
MA443/MA445
display
when
the
tested
voltage
is
>
30V
and
sounds
the
buzzer
when
the
voltage
input
is
>
600V.
Fig.
5
MA443/MA445
Voltage
test
Fig.
6
–
MA440
Voltage
testing
AC
DC
V
AC
DC
V
