Radio Shack 2200087 - Measuring DC;AC Voltage; Measuring DC;AC Current

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Measuring
DC/AC
Voltage
You
can
measure
AC
voltage
superimposed on
a
DC
voltage source
bias
while
ignoring
the
DC
voltage,
but
never
try
to
measure
an
AC
voltage
that
is
riding on a
DC
source
bias
where
the
peak
AC
voltage
exceeds
1000V with
respect
to earth
ground.
NN
WARNING: Do
NOT
try
to
measure
a
DC
voltage
above
1000
volts
oran
AC
voltage
above
750
volts
RMS,
and
never
clamp
a
test
lead
to
a
hot
wire
(usually
red,
black,
or
blue
in
AC
wiring
circuits).
If
one
lead
is
clamped
to
a
hot
wire
and
you
touch
the
meters
other
probe,
you
could
receive
an
electric
shock.
1.
Setthe
function
dial
to
=2V/dBm.
To
measure
AC
voltage,
press
SELECT
to
show dBm
or
a
volts
unit
with
~ in
front of
the
value.
To
measure
DC
voltage,
press
SELECT
to
show
a
volts
unit
without
~
in
front of
the
value.
2.
Ifthe
meter
is
set to
automatic
range
control,
it
automatically
moves
to
the
range
that
gives
the best
reading.
To
manually
set
the
range,
press
RANGE
([NUI[§]
disappears).
Press
RANGE
again
to
change
the
range
(if
necessary)
3.
Power
off
the
circuit
under
test.
Touch
the
test
leads
to
the
circuit.
Or,
to
measure
AC
voltage superimposed
on
a
DC
voltage
source
bias,
connect
a
0.1
microfarad
(uF)/100V
mylar
capacitor
(not
included)
in
series
with
the
positive
terminal of
the
circuit and
the
red
test
lead,
then
power
on
the
circuit and
read
the
AC
voltage.
©
Note:
When
the
meter
is
set
to
the 600mV
range,
OF
continues
to
appear
even
after
you
remove
an
over-range
input
signal.
This
is
normal. Touch
the
test
leads
together
or
connect
them
to
a
circuit
to
make
OF
disappear.
+
0dBmis
equal
to
the
consumption
power
on a
600-ohm
resistor
with
0.775V
voltage
drop.
Measuring
DC/AC
Current
To
measure
DC/AC
current.
you
must
break
the
circuit
and
connect
the
test
leads
to two
circuit
connection
points.
The
connection must
be
in
series
with
the
circuit
under
test.
OD
warning:
=
Never
connect the
test
leads
across
a
voltage
source.
Doing
so can
damage
the
meter
or
the
circuit
under
test.
The
maximum
input
limit for AC/DC
current
measurement
is
10A.
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