Mastech M840D - Method of Measurement; DCV & ACV Measurement; DCA & ACA Measurement

6)
7)
8)
Ei$er
one
of
tfre
test
leads
should
h taken
offfrom
he
circuit
under
test
w,len
changing
he
test
ranges.
lb
avoi'c
eledrical
shock
or
damage
tb
üle
meter;
Do
not
apply
msre
then
500v
between
any
terminal
and
eartrr
gn:und.
-
r t-.1
To
avoid
elecfrical
shock,
use
caution
wñen
rarcrking
above
60wc
or 25VAC
rms,
such
voltage
po$e
a shock
hazard.
9)
when
finished
the
measurernent,
switch
off
the
pou€r.
Be
sure
to
rcmüve
the
battery
when
it
is
not
used
for
a long
time
to
avoid
leakage
problem.
10)
Do
not
tamperwih
flre
ciranitry
to
avoid
damage.
11)
Do
not
use
or
store
the'instrunrent
in
a
plae
of
direct
sunlight,
hlgh
ternperature
and
high
humidrty
5.
-MEIHOD
OF
TFTEASURTN¡CrIT
5.1
DCV
& ACV
MEASUREMENT
1)
set
the
Function
range
swttch
at
the
required
position.
2)
CCInnect
black
tmt
bad
to
'CCIM"
terminal
and
red
te$t
lead
to
tre
'VIOHM"
input
tenninal.
3)
Conned
test
leads
to
measuring
point
and read
the
display
value
üre
polarfu
of
üre red
lead
mnnedion
will
be
indicated
at the
sarne
t¡me
ii
the
vofhge.
Noüe:
a)
b)
c)
Never
try
to
measure
the
voltage
above
1000v1
Alfrough
he
indication
is
pssible
t'0
show,
there
is
a
danger
of
darnaging
the internalcircuitry.
5;2
DGA
&
ACA
MEASUREMENT
1)
Connmt
the
black
test
lead
to
the
"COM"
terminal
and
fre
rcd
test
'
lead
to
"A'
terminal
for
a rnaximum
of
0.5A
(mqdel
Mg40D
**¡*u*
2A)
2\
set
fre
function
range
switdr
at
tlre
requird
position.
3i
Conned
test
leads
to
measuring
poinh
and
read
fre
display
value.
The
polanly
at the
red
test lead
mnnedion
will
be
indicated
ait tne
sarne
time
as the
cunent.
l!
the volbge
to
be tested
is
unknown
beforehand,
set
the
-fqnction{anüe
switch
to
fre
highest
range
and
r¡¡crk
dovur.
]n{.en
only
the
figure
"1"
ir
displayed-over
rangq
is
being
indicated
and
the
func{ion
range
switc*l
should
ne
set
to
á
higher
range.