Radio Shack 2200087 - Measuring Resistance

9.
Ifyou
do
not
know
the
amount of
current
in
the
circuit
you
are
measuring,
always
connect
the red
test
lead
to
+10A
MAX.
Rotate
the
function
dial
to
pA/A/==
for
600/6000pA
and
6/10A
ranges
or
to
mA/A/== for 60/400mA
and
6/10A
ranges.
Press
SELECT
to
measure
AC
current
(~
appears)
or
DC
current
(~
disappears).
Power
off
the
circuit
under
test
and
discharge
all
capacitors.
Plug
the
black
test
lead
into
~COM
and
the
red
test
lead
into
the
appropriate
Jack.
Connect
the
meter's
test
leads
in
series
with
the
circuit.
Apply
power
and read
the
current
value.
If
the
measurement
is
less than
400mA
and
the
red
test
lead
is
connected
to
+10A
MAX,
power
off
the
circuit.
If
your
measurement
exceeds
the
selected
range,
OF
appears
until
the
measured
current
is
reduced
to
the
selected
range.
Move
the
red
test
lead
to
+
V.mA.Q.
Rotate
the
function
dial
to
pA/A/==
or
mA/A/==,
depending on
the
value
you
measured
in
Step
6.
Reapply
power
to
the
circuit.
t
1
Note:
Ifyou
are measuring
DC
current
and the
current’s
polarity
is
negative,
=
appears
before the
value.
Measuring
Resistance
1.
2.
3.
Power
off
the
circuit
under
test
and
discharge
all
capacitors.
Rotate
the
function
dial
to
Qk
If
the
display
shows
8.8000
nF
or
8.000
pF,
press
SELECT
to
change
to
the
Resistance function.
When
you
rotate
the
function
dial
to
Q/1k,
the
meter
resets
to automatic
range
control
and
automatically
moves
to
the
range
that
gives
the best
reading.
To
manually
set
the
range, press
RANGE
([X8I[#]
disappears).
Press
RANGE
again
to
change
the
range
(if
necessary).
Touch
the
test
leads
across
the
resistor
(that
is,
a
test
lead
on
each
resistor
lead),
or remove one
of
the
component
leads
from
its circuit
and touch
the
test
leads
across
the
resistor.
13
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i
=
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