Radio Shack 22-174A - Making Measurements; Meter Operation Basics

WARNING: DO NOT
OPERATE
THE METER
CORRECTLY
INSTALL
THE BATTERIES AND
BATTERY COMPARTMENT
COVER.
When
the batteries become
weak, BATT
appears
on the
left
side
of the display. Replace
all batteries.
Bemove the bat-
teries
when
you
will
not use the
meter for a
week
or
more.
Never leave
lireak
or dead batteries
in
your
meter.
Even
leak-proof
batteries
can leak damaging chemicals.
USING
TEST LEADS
Use
only the type of test
leads supplied with
your
meter.
These
leads
are
rated lor
1200 volts. You
can
buy replacement
leads
(Cat.
No. 278-7041from
your
local Radio
Shack
store.
Cautions:
o
Although these test
leads
are
rated for 1200
volts,
the
maxi-
mum rating of this meter
is 1000 volts DC and
750 volts AC.
Do not try to
measure any voltage that exceeds
these
rat-
ings. Use extreme caution
when
you
use
high-voltage
ranges.
o
Be sure
you
always
select the correct
function before
you
attach
the test
leads to the circuit to be
measured. You can
blow one or
more fuses if
you
rotate
the.function
control
while there
is
current
or voltage
present.
MAKING
MEASUREMENTS
-
|
TURNING
ON
THE
METER
To
turn
on the
meter,
set
OwOFF
to ON.
UNTIL YOU
CLOSE
THE
UNDERSTANDING
PHANTOM
READINGS
lf
you
do not
connect
the
meter's
probes
to
a circuit,
and select
DC
or AC
volts,
the
display might
show
a
phantom
reading.
This.is
a wandering
effect
produced
by
the meter's
high inpit
sensitivity
and is normatlor
most
highquality,
high-impedSe
meters.
When
you
connect
the
probes
to
a circuit,
a
real
meas-
urement
appears.
OVERRANGE
INDICATTON
The
following
display
appears when
the measurement
exceeds
the
selected
range.
lf
you
are measuring
volts
or amps,
discon-
nect
the meter
from
the
circuit
you
are measuring'or
change
the meter's
measuring
range.
See,,Notes"
on
page
t8.
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