Radio Shack 2200087 - Measuring Logic and Frequency; Logic Level Measurement; Frequency, Duty Cycle, and Pulse Width; Measuring AC Voltage;Current Frequency

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Measuring
Logic
DN
WARNING:
Do
not
apply
more
than
5V
DC
between
terminals.
This
could
damage
the
meter
or
the
circuit
being
tested.
1.
Rotate
the
function
dial
to
Hz/LOGIC.
2.
Press
SELECT
once.
LO
appears.
3.
Connect
the
test
leads
to
the
device
you
want
to
check.
+
LO
appears
if
the
logic
is
low
(the
voltage
is
lower
than
1.0V).
+
Hi
appears
if
the
logic
is
high
(the
voltage
is
higher
than
2.0V)
+
The
actual
voltage
appears
if
the
logic
is
between
1
and
2V.
Measuring
Frequency/Duty
Cycle/Pulse
Width
The
meter
can
measure
frequency
from
10Hz
to
4MHz
and
duty
cycle
and
pulse
width
with
a
signal
frequency
from
10Hz
to
100kHz.
The
amplitude
of
the
signal
should
not be
larger
than
10V
peak
1.
Rotate
the
function
dial
to
Hz/LOGIC.
2.
Press
SELECT
until
Hz,
KHz,
or
MHz
appears.
Otherwise,
press
Hz/DUTY/WIDTH
to
select
duty
cycle
function
(%
appears)
or pulse
width
function
(uS
or
mS
appears).
3.
Connect
the
black
test
lead
to
a
ground
reference
for
the
signal,
and
connect
the
red
test
lead
to
the
signal
source.
“
1
Note:
For
Pulse
Width
and
Duty
Cycle,
apply
+5/-0V
square
wave.
Measuring
AC
Voltage/AC
Current
Frequency
The
meter
can
measure
the
frequency
of
an
AC
voltage,
with
or
without
a
DC
source
bias.
NN
WARNING:
To
avoid
electrical
shock
and
damage
to
the
meter,
never
try
to
measure
a
frequency
of
more
than
1kHz
between
AC
40
volts
RMS
and
750
volts
RMS.
1.
[Ifyou
are
measuring
AC
voltage
with
a
DC
source
bias,
set
the
function
dial
to==V/dBm.
To
measure
AC
current
frequency.
rotate
the
function
dial
to
pA/A/==
for
600/6000pA
and
6/10A
ranges
or
mA/A/2%
for
60/400mA
and
6/10A
ranges.
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