Radio Shack 22-812 User manual

www.SteamPoweredRadio.Com
RadioShack
46-Range ·
PC
Interface
22
- 8 12
Digital
Multimeter
Thank you
for
purchasing your 46-Range •
PC
Interface Digital Multimeter from
RadioShack.
The
meter
measures voltage, current, resistance, capacitance,
and
frequency.
It's
ideally
suited
for
field, lab, shop,
and
home
applications. You can a/so
connect
the
meter
to
your
computer
and
use
the
supplied
software to log
and
graph
measurements. Please read this user's
guide
before
installing,
setting
up,
and
using your
new
multimeter.
What's
Included
Digital
Multimeter
I
Rubber
Boot
Fuse F12A/250V
(2)
Test Leads
(2)
CD-ROM
User's
Guide
www.radioshack.com
RS-232
Cable
Fuse FSOOmA/250V
(2)

www.SteamPoweredRadio.Com
Contents
Safety Precautions ............................................................................4
Using the Meter wl i th a Computer ................................................... 18
Special Panel Markings.........................................................................................5 System Requirement.....
.. ..................................................................... ... ......... .. 18
Care and Maintenance ..........................................................................................5 Installing the Meter's Software/Hardware .....................................................
18
A Quick Look at Your Meter ...............................................................6 Configuring/Using
the Meter and Software ..................................... ... ............ 18
Preparation .......................................................................................8 Specifications ..................................................................................20
Installing the Battery .............................................................................................8
Replacing the Fuses ..............................................................................................8
Basic Operation and Features ............................................................9
Testing the Display................................................................................................ 9
Using the Stand .....................................................................................................9
Connecting Test Leads...........................................................................................9
Using Power Lock ...................................................................................................9
Using Monitor ......................................................................................................
10
Range Selection ................................................................................................. 10
Taking Measurements ..................................................................... 11
Taking Relative Measurement........................................................................... 11
Displaying Temperature .................................................................................... 11
Measuring DC/ AC Voltage ...................................... .. ......................................... 12
Measuring DC/ AC Current ................................................................................. 12
Measuring Resistance ....................................................................................... 13
Measuring Capacitance ............................................................................ ... ...... 14
Checking Continuity ........................................................................................... 14
Checking Diodes ................................................................................................. 15
Measuring Logic ................................................................................................. 15
Measuring Frequency/Duty Cycle/Pulse Width ............................................. 16
Measuring AC/DC Voltage Frequency ........................................................... ... 16
Measuring hFE .................................................................................................. .. . 17
RadioShack. 2 3 RadioShack.

www.SteamPoweredRadio.Com
Safety
Precautions
Safety
Precautions
Read and
follow
these safety precautions.
• Never
apply
voltages
to
the
meter
that
exceed
the
limits given in
the
specifications.
Never
apply
more
than 1000V
DC
or
750V
RMS
AC
between
the
input
jacks and
ground.
• Use extreme caution when
working
with voltages above
1
OOV.
Always
disconnect
power
from
the
circuit you are measuring
before
you
connect
test
leads
to
high-voltage
points.
• Never
connect
the
test
leads
to
a
voltage
source when you set
the
meter's
function
dial
to
•
1
>)/
i:lt-
,
0 /~~' LOGIC/Hz,
-:-:-JµA/
A,
or
-:-:-JmA/
A.
• Always discharge any capacitors
of
the
circuit
under
test
before
you attach
test
leads.
• Always turn
off
power
and
disconnect
the
test
leads
from
the
circuit you are
testing
before
you replace
the
meter's
battery
or
fuse. Never
operate
the
meter
unless its back cover and
battery
cover are in place and fully closed.
• Never try
to
probe
with
both
test
leads
at
the
same
time
or
hold
both
test
leads in
one
hand.
• The
test
leads
supplied
with your
meter
are rated
for
1000 volts. Use only
test
leads
of
the
same rating with
the
meter.
You
can
order
replacement leads
from
your local
RadioShack
store.
•
Do
not
use a fuse
brand
or
rating
other
than those specified here.
Doing
so
might
damage
your
meter
.
• Because many
AC/DC
sets have a
potentially
hot
chassis,
be
sure
the
top
of
your workbench and
the
floor
underneath
it
are
made
of
non-conductive
materials.
• Your
multimeter
is
designed
primarily
to
measure
household
AC
voltages.
Because
of
the
dangers inherent in measuring
three
-phase circuits, WE
STRONGLY
RECOMMEND
YOU
DO
NOT
USE
THIS METER
TO
MEASURE
3-PHASE, LINE-TO-LINE VOLTAGE. Ifyou still
want
to,
put
on
protective
clothing-a
face shield and
fireproof
gloves and
upper
body
protection
is
required
before
measuring. Ifyou
do
not
have this
protection,
DO
NOT
MEASURE THESE CIRCUITS.
•
To
reduce
the
risk
of
fire
or
shock hazard,
do
not
expose this
product
to
rain
or
moisture. For
indoor
use only.
•
When
you are
not
using
the
meter, always turn
it
off
.
• Ifthis
equipment
is
used in a manner
not
specified in this user's
guide,
the
protection
provided
by
the
equipment
may
be
impaired
.
RadioShack. 4
This
meter
is
fully calibrated and tested.
Under
normal use,
no
further
adjustment
should
be
n~cessary. If
the
meter
requires repair,
do
not
try
to
adjust
it
yourself.
Take
it
to
your
local
RadioShack
store.
Special
Panel
Markings
&
CAUTION:
Risk
of
electric shock! Refer
to
the
complete
operating
instructions.
IA
CAUTION:
Be
extremely careful when making high-voltage
measurements;
DO
NOT
TOUCH TERMINALS
OR
PROBE ENDS.
[g]
The
meter
is
protected
by
double
insulation.
1
KV
.....
The maximum voltage
that
this
meter
can measure
is
10CX)V
DC
or
750V~
750V AC. The maximum current
that
this terminal can measure
is
400mA 400mA DC and AC.
MAX
+10A
MAX
The maximum current you can measure at this jack
is
10 amps DC/AC.
FUSED
This jack
is
fuse-protected.
CAT.
JI
This
equipment
is
rated
for
INSTALLATION CATEGORY
II
(3600VA
max).
soov
To
avoid electrical shock
or
instrument damage,
do
not
connect the
MAX
common
input
terminal
(
-COM
jack)
to
any source
that
exceeds 500
~
volts with respect
to
earth/ground
.
WARNING:
The sliding guard on
the
front
of
the
meter
protects against electrical
Shock Hazard
if guard not
shock.
Do
not
remove
the
guard.
installed.
Care
and
Maintenance
. Keep
the
meter
dry;
if it
gets wet,
wipe
it
dry
immediately
and make sure
that
the
meter
is
completely
dry
before
using
it
. Use and store
the
meter
only in normal
temperature
environments. Handle
the
meter
carefully;
do
not
drop
it.
To
keep
the
meter
looking
new, occasionally
wipe
it
with a cloth slightly
dampened
with water.
Do
not
use harsh chemicals, cleaning solvents,
or
strong
detergents
to
clean
the
meter. ·
RadioShack.
5

www.SteamPoweredRadio.Com
A
Quick
Look
at
Your
Meter
f4!Im -Appears
in
the
auto range
mode.
The
meter
automatically enters
the
auto range
mode
when you turn
it
on.
°C/°F/
::-::-:
V -
Displays
temperature/
measures
DC
volts.
dBm /
,...._,
V -
Measures
AC
voltage in
dBm
or
volts.
~
I
µAlA -
Measures current.
~
I
mA/A-
Measures current.
0 / 1
~
-
Measures ohms and capacitance.
•l
l)
/
-c,t,
-Checks continuity and diodes.
LOGIC/Hz -
Measures
logic
(HI/LO) / frequency.
hFE
-
Measures
the
gain
of
small-signal
bipolar
transistors.
1----:'--:-,
OFF -
Switches
off
the
meter.
Rubber Boot -
Protect
the
meter
and store
the
test
leads
---
using
the
clips
on
the
back.
Sliding Guard
WARNING: THE GUARD PROTECTS AGAINST ELECTRIC
---,,--
SHOCK.
DO
NOT
REMOVE
IT.
+
1
0A
MAX
FUSED -
Plug
the
red lead
into
this jack
to
measure current
higher
than 400 mA.
RadioShack.
6
SELECT -
Press
to
toggle
measurement
options
within a
function.
RANGE -
Selects auto
or
manual ranging.
Press
to
enter
the
manual range
mode
and press
to
select
different ranges.
Hold
down
about
2 seconds
to
exit
the
manual range
mode
.
HOLD -
Press
to
hold
all indications
on
the
display.
To
cancel hold, press
HOLD
again
or
set
the
function dial
to
another setting.
RE~
-
Takes relative measurements.
Hz/DUTY/WIDTH
-
Measures frequency,
duty
cycle, and pulse
width.
MAX/MIN
-
Stores maximum and minimum readings.
Function/Power dial
Rotate
to
turn
the
meter
on/off. Rotate
to
select
the
measurements, then press
SELECT
to
choose
the
function.
7 RadioShack.

www.SteamPoweredRadio.Com
Preparations
Installing
the
Battery
Your
meter
requires
one
9V
battery
(not supplied)
for
power.
When
CZ)
appears
or
the
meter
stops
operating
properly
,
replace
the
battery
.
1. Remove
the
rubber
boot
ifit
is
attached.
2. Turn
off
your meter. Loosen
the
screw and remove
the
battery
cover.
3. Snap a fresh 9V
battery
(not supplied)
onto
the
terminals
of
the
battery
clip in
the
battery
compartment
.
4. Replace
the
battery
cover and secure
it
with
the
screw.
Battery
Notes:
• Dispose
of
old
batteries
promptly
and properly.
Do
not
burn
or
bury
them
.
• Use
on
ly a fresh battery
of
the
required size and
recommended
type
.
• Ifyou
do
not
plan
to
use
the
meter
for
a
month
or
more, remove
the
battery. Batteri
es
can leak chemicals
that
can destroy electronic parts.
Replacing
the
Fu
s
es
If
the
meter
does
not
work, replace
one
or
both
of
the
fuses. The spare 500mA, 250V ceramic fuse
and a 12A, 250V ceramic fuse are inserted in
the
plastic holders inside
the
meter
's
cabinet
near
the
top
of
the
meter
.
1. Turn
off
the
meter
and disconnect
the
test
leads.
2. Use a Phillips screwdriver
to
loosen
the
screws
from
the
back cover and
gently
pull apart
the
case.
3. Pull
the
red ri
bbon
to
pop
out
the
fuse.
4.
Remove
the
spare fuse from
the
plastic
holder
Spare fuses
and insert it i
nto
the
fuse
holder
through
the
Fu
ses
in
red
ri
bbons
loop
of
the
attached
ribbon
. Check
the
rating
of
the
fuse carefully
and
choose
the
proper
one
.
5. Replace
the
back cover and secure it with
the
screws.
R
ad
ioSh
ack
.
8
Basic
Operation
and
Features
For
the
most
accurate reading,
the
temperature
should
be
between
65° and 83°F
(18°
and
28°C), with a maximum
of
75% relative humidity.
Testing
the
Display
To
test
the
meter's display,
turn
off
the
meter,
then
hold
down
HOLD
while
turning
on
the
meter. The
meter
turns
on
and
all segments
on
the
display appear. Release
HOLD
to
end
the
test
.
Using
the
Stand
You
can
fold
out
the
stand on
the
back
of
the
meter
to
place
it
upright
on a flat
surface
for
easier viewing.
Connecting
Test
Leads
Remove
the
plastic plugs
before
using your
test
leads.
Slide
up
the
guard
on
the
front
of
the
meter
if
necessary. Plug
the
black
test
lead's
right-angled
end
into
-COM
(common), then
plug
the
red
test
lead's
right-angled
end
into
+v
.n.
mA.
If
you want
to
measure current
higher
than 400mA,
plug
the
red
test
lead's
right-angled
end
into
+1
OA
MAX
instead
of
+V.
n.
mA.
WARNING:
•
Although
the
test leads are rated
for
1000 volts,
the
maximum rating
of
this
meter
is
1000 volts DC/750 volts
RMS
AC.
Do
not
try
to
measure voltage greater than 1000
volts DC/750 volts
RMS
AC.
• The
meter
sounds a warning
tone
when you set
it
to
measure anything except current
and you connect a test lead
to
+1
OA
MAX
.
This reminds you
not
to
touch
the
circuit
with
the
test leads.
Using
Power
Lock
Your
meter
aut~matically turns
off
about
30 minutes when
left
unattended
.
Press
any
button
to
turn
the
meter
back on. Follow these steps
to
set
the
meter
so
it
does
not
turn
off
automatically.
1. Turn
off
your meter.
2.
Hold
down
HOLD
and
SELECT
simultaneously, then turn
on
the
meter
.
PLoc
appears until you release
both
buttons
.
To
reactivate
the
meter's auto
power
off
function, turn
off
the
meter
then turn
it
back on.
9 RadioShack.

www.SteamPoweredRadio.Com
Basic
Operation
and
Features
Using
Monitor
The meter's
monitor
feature displays
the
minimum
or
maximum value measured
and stores those values. If
the
meter
measures a value
higher
than
the
stored
maximum value
or
lower
than
the
stored
minimum
value,
it
updates
the
stored
value with
the
new
value. The
meter
automatically sets itself
to
manual
mode
and
disables auto
power
off
when you use
it
to
monitor
.
1. Set
the
meter
to
any
function
except
°Cl°F
, dBm,
•
>l)
, ~ .
LOGIC, or
hFE
.
2.
Connect
the
test
leads
to
the
circuit.
3.
Press
RANGE
to
select a suitable range
for
monitor
measurement.
4.
Press
MAX/MIN
to
record
the
maximum and
minimum
values. Max appears.
Press
MAX/MIN
to
read
the
currently selected maximum value (when Max
appears)
or
minimum
value (when Min appears).
5.
To
pause
monitoring,
press
HOLD
. Hold appears.
To
continue
monitoring
,
press
HOLD
again. Hold disappears.
To
exit
monitor
mode
, press
MAX/MIN
for
more
than 2 seconds. Max or Min
disappears.
Note
:
When
the
meter
is
set
to
its
vol
t
age
or current function
and
the
i
nput
is
out
of
the
sett
ing's range,
OF
appears
and
Max or Min
flashes
on
the left si
de
of
the
display.
Range
Selection
Set
the
meter
to
the
different measurement ranges. The
unit
of
measure
that
appears
on
the
display shows
the
currently set range.
Note
the
position
of
the
decimal. If0.000 V appears,
the
meter
is
set
to
measure less than 4 volts. If
OOOOV
appears,
the
meter
is set
to
measure
up
to
1000 volts.
Read
the
range in volts, ohms, capacitance,
or
amps
as
i
ndicated
by
the
position
of
the
dec
imal point.
~~
(:~.--
·.\\.:i·
·•.·.
~
,·
--~
~··
.
-~.£
~
..
,~.rr~
400mV
ddd.d mV
4mA
d.ddd
mA
400kn
ddd.d kn
4V
d.ddd V
40mA
dd.dd
mA
4Mn
d.ddd
Mn
40V
dd.dd V
400mA
ddd.d
mA
40Mn
dd.dd
Mn
400V
ddd.d V
4A
d.ddd A
4
nF
d.ddd
nF
1000V
DC
dddd V
10A
dd.dd A
40
nF
dd.dd
nF
/
750VAC
400n
ddd.d
n 400
nF
ddd.d
nF
4kn
d.ddd
kn
4
µF
d.ddd
µF
400
µA
ddd.d µA
40kn
dd.dd
kn
40µF
dd.dd
µF
RadioShack.
10
Taking
Measurements
Taking
Relative
Measurement
The
meter
allows irou
to
take measurements with zero offset
or
other
values
as
reference using
the
REL
A
button.
Use
zero
offset
as
r
eference
1. Set
the
meter
to
any
function
except
°Cl°F
, dBm,
•
>>
), ~ .
LOGIC, or
hFE
.
2. Disconnect
test
leads
for
capacitance,
or
touch
the
test
leads
together
for
other
functions
to
measure zero offset.
3.
When
you see
the
reading,
hold
down
REL
A .
Rel
A
appears.
4. Take a measurement.
You
will
get
the
actual value
of
the
measured
component
.
Use
baseline
as
reforence
1.
Set
the
meter
to
any
function
except
°Cl°F, dBm,
•
>l)
, ~ ,
LOGIC, or
hFE
.
2. Press RANGE
to
select a suitable range
for
relative measurement
if
necessary.
3.
Connect
the
test
leads
to
the
component
whose measurement you
want
to
use
as
a baseline.
4.
When
you see
the
reading,
hold
down
REL
A .
Rel
A appears. The
meter
sets
to
manual range.
5. Take a measurement.
You
will
get
the
relative value
of
the
measured
component
to
the
baseline. If
the
measured value
is
lower
than baseline,
the
meter
will show a negative relative value.
To reset a relative measurement, press
REL
A again
or
set
the
function dial
to
another
setting
.
Displaying
Temperature
You
can use
an
optional
thermocouple
module
(not supplied)
to
measure
temperature
with
your
meter
.
WARNING:
Do
NOT
use
the
thermocouple
to
measure objects when
the
voltage
is
above 30 V
RMS
and 42.4 V
peak
or
60V
DC
.
1. Set
the
function
dial
to
°Cl°F
/
=-=-=
V.
2.
Unplug
both
test
leads
from
the
meter
,
plug
the
therrT)ocouple's
common
plug
into
-COM
(common),
then
plug
the
thermocouple's
+V
plug
into
+V.mA.n
.
3.
Press
SELECT to select
temperature
measurement. Then press RANGE
to
toggle
between
Celsi
us
and Fahrenheit, C
or
F appears.
4. Touch
the
thermocouple's
sensor head
to
the
object
you
want
to
test.
RadioShack.
11

www.SteamPoweredRadio.Com
Taking
Measurements
Measuring
DC/
AC
Voltage
WARNING:
Do
NOT
try
to
measure a
DC
voltage
above 1000 volts
or
an
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
meter's
other
probe,
you
could
receive
an
electric shock.
1.
To
measure
DC
voltage, set
the
function
dial
to
0
C/°F
/ == V
and press
SELECT
to
select
DC
voltage
measurement.
To
measure
AC
voltage, set
the
function dial
to
dBm/"-'V
and press
SELECT
to
select dBm
or
volts
unit
.
2.
If
the
meter
is
set
to
automatic
range control,
the
meter
automatically moves
to
the
range
that
gives
the
best
reading.
To
set manual range control, press
RANGE
then change
the
range (if
necessary)
by
pressing
RANGE.
3. Touch
the
test
leads
to
the
circuit you
want
to
test.
Notes
:
•
When
the
meter
is
set
to
the
400mV range,
OF
continues
to
appear
even after you
remove an
over
-range i
nput
signal. This
is
not
a malfunction.Touch
the
test
leads
together
or
connect
them
to
a circuit,
then
OF
disappears.
• 0
dBm
is
equal
to
the
consumption
power
on
a 600-ohm resistor
with
0.775V
voltage
drop.
You
can also
follow
steps 1-3 above
to
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 1000 V with respect
to
earth
ground
.
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.
WARNING:
•
Never
connect
the
test
leads across a
voltage
source.
Doing
so can
damage
the
meter
or
the
circuit
under
test. The
maximum
input
li
mit
for
AC/DC
current
measurement is 1
OA.
If
you
do
not
know
the
amount
of
current in
the
circuit you are measuring, always
connect
the
red
test
lead
to
+1
OA
MAX.
RadioShack.
12
1
Taking
Measurements
1. Rotate
the
function
dial
to
~ JµA/A
for
0.
4/4mA
and
4/10A
ranges
or
~ JmA/A
for
40/400mA
and
4/1
0A
ranges, and press
SELECT
to
measure
AC
current
(-
appears)
or
DC
current
(-
disappears).
2. Power
off
the
circuit
under
test
and discharge all capacitors.
3. 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.
4.
Apply
power
and
read
the
current value. If
the
measurement
is
less than
400mA
and
the
red
test
lead
is
connect~d
to
+
1
OA
MAX
,
power
off
the
circuit.
If your measurement exceeds
the
selected range,
OF
appears until
the
measured current
is
reduced
to
the
selected range.
5.
Move
the
red
test
lead
to
+
V.mA.n
.
6.
Rotate
the
function
dial
to
~ JµA/A
or
~JmA/A
depending
on
the
value you
measured in Step
4.
7. Reapply
power
to
the
circuit.
If
you are measuring
DC
current and
the
current's
polarity
is
negative, -appears
before
the
value.
Measuring
Resistance
1.
Power
off
the
ci
r
cuit
under
test
and discharge all capacitors.
2.
Rotate
the
function
dial
to
O / U
and press
SELECT
until
O
(ohm),
KO
(kilohm),
or
Mn
(megohm) appears.
3. Touch
the
test leads across
the
resistor,
or
remove
one
of
the
leads
of
the
component
from
its circuit and
touch
the
test
leads across
the
resistor.
Notes
:
•
With
no
resistancE?
connected
across
the
test
leads (meaning resistance
is
infinite),
OF
appears when yo
lJI
measure
res
istance.This
is
normal.
•
If
you are measuring resistance
of
about
1
Mn
or
more,
the
display
might
take a few
seconds
to
stabili2:e. This
is
normal.
•
To
calculate and measure a very small resistance,
touch
the
test leads
together
to
measure
the
mE~ter
's internal resistance, and
then
substract this value from
the
measurement. Refer also
to
"
Taking
Relative
Measurements
"
on
page
11.
RadioShack.
.13

www.SteamPoweredRadio.Com
Taking
Measurements
Measuring
Capacitance
The
capacitance
measuring
circuit in
your
meter
charges a
connected
capacitor
to
a
specif
ic
voltage
level,
then
discharges
the
capacitor
to
a
lower
voltage
.
The
meter
measures
the
·
amount
of
time
it
takes
to
discharge
the
capacitor
.
1. Power
off
the
circuit
under
test
and
discharge all capacitors.
2. Rotate
the
function
dial
ton/
➔~
and
press SELECT
until
nF or µF appears.
3.
Attach
the
red
test
lead
to
the
positive
side
of
the
capacitor
and
attach
the
black
test
lead
to
the
negative
side
. Or,
remove
one
of
the
leads
of
the
capacitor
from
its
circuit
and
connect
the
test
leads
to
the
capacitor's
matching
(posit
ive
or
negative)
terminals
.
The
measured value
appears
.
Notes
:
• The voltages applied
across
electrolyt
ic
capacitors affect their measured value.
That
is,
ameasurement taken with a low voltage wi
ll
be lower than one taken with a
voltage near the capacitor's voltage rating.
Sin
ce
this meter cannot
use
high voltage
to
set the electrolyte, it cannot measure the absolute value
of
capacitance.
•
For
low-value capacitors, the
mea
su
re
ment might be very close
to
the meter's actual
input capacitance.
Use
the meter's relative feature
to
measure low capacit
ance
values.
• Capacitance measurement accuracy depends
on
the measurement method and
differs with different types
of
capacitors.
The
meter's measurement isfor reference
only.
Checking
Continuity
You can use
the
meter
to
check
for
shorted
or
open
electrical circuits.
1. Power
off
the
circuit
under
test
and
discharge
all capacitors.
2.
Rotate
the
function
dial
to
•i>)
/
i::it-
and
press SELECT
until
•
i>)
appears.
3.
Touch
the
test
leads across
the
circuit
you
want
to
measure.
Shrt
appears and the buzzer sounds ifthe circuit resistance
is
less
than about
50
ohms
(meaning the circuit
is
continuous or shorted).
Open
appears and the meter's buzzer does not sound ifthe circuit resistance
is
greater than about
50
ohms (meaning the circuit
is
not continuous).
RadioShack.
14
Taking
Measurements
Checking
Diodes
You can check
diodes,
transistors,
and
other
semiconductors
for
opens, shorts,
and
normal
operation,
and
determine
the
forward
voltage
and
polarity
for
diodes
.
You can also
check
LEDs.
1.
2.
3.
Power
off
the
circuit
under
test
and
discharge all capacitors.
Rotate
the
function
dial
to
•
ll)
/
i::it-
and
press SELECT.
i::it-
appears
.
Connect
the
test
leads
to
the
device
you
want
to
check,
or
remove
one
of
the
leads
of
the
component
from
its circuit
and
connect
the
test
leads
to
the
component
.
Note
the
first reading.
4. Reverse
the
test
leads
and
note
the
second
reading
.
If
one
reading
shows a value
and
the
other
is
overrange
(OF appears)
the
device
is
good
.
If
OF appears
during
both
readings,
the
device
is
open
.
If
both
values are
very small
or
zero,
the
device
is
shorted.
Notes
:
• When
you
test asilicon-type
sem
iconductor, the values might
vary
depending on the
temperature.
• The values that appear during a diode check show the actual forward voltage
(2
.
0V
max)
. If the voltage exceeds 2.
0V,
OF appears.
The
meter cannot check this diode.
•
To
check polarity
of
an
unmarked diode:
Connect
the
test
leads
to
the
two
sides
of
the
diode.
Measure
and
note
the
voltage.
Then, reverse
the
test
leads, measure
and
note
the
second
reading
.
The
side
of
the
diode
where
the
meter
shows a
higher
voltage
using
the
red
test
lead
is
the
anode(+)
side.
The
side
of
the
diode
where
the
meter
shows OF using
the
red
test
lead
is
the
cathode
(-} side.
Measuring
Logic
WARNING
:
Do
NOT
apply
more
than
5 V
DC
between
terminals
. This
could
damage
the
meter
or
the
circuit
being
tested.
1. Rotate
the
function
dial
to
LOGIC/Hz
and
press SELECT
once
. LO appears.
2.
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
2 V
RadioShack.
15

www.SteamPoweredRadio.Com
Taking
Measurements
Measuring
Frequency/Duty
Cycle/Pulse
Width
The
meter
can measure
frequency
from
10 Hz
to
4
MHz
and
duty
cycle and pulse
width
with
a signal
frequency
from
10 Hz
to
100 kHz. The
amplitude
of
the
signal
should
not
be
larger than 1
OV
peak
.
1. Rotate
the
function
dial
to
LOGIC/Hz
and press
SELECT
until
Hz, KHz,
or
MHz
appears.
Otherwise, press
Hz/DUTY/WIDTH
to
select
duty
cycle
function(
% appears)
or
pulse
width
function
(µ
S
or
mS
appears).
2.
If
you are measuring frequency, press
RANGE
if
necessary
to
select manual
range
then
press
RANGE
until
the
range you
want
appears.
3.
Connect
the
black
test
lead
to
a
ground
reference
for
the
signal, and
connect
the
red
test
lead
to
the
signal source.
Measuring
AC
Voltage/
AC
Current
Frequency
The
meter
can measure
the
frequency
of
an
AC
voltage,
with
or
without
a
DC
source bias.
WARNING:
To
avoid electrical shock and
damage
to
the
meter, never
try
to
measure a
frequency
of
more
than 1 kHz
between
AC
40 volts RMS and 750 volts
RMS.
1.
If
you are measuring
AC
voltage
with
a
DC
source bias, set
the
function
dial
to
dBm
/,.,.,
V.
Otherwise, set
the
function
dial
to
°C/°F/
=
V.
To
measure
AC
current
frequency,
rotate
the
function
dial
to
~ /
µA/A
for
0.4/4mA
and
4/10A
ranges
or
~ /
mA/A
for
40/400mA
and
4/10A
ranges.
2.
To
select
the
frE'.lquency
function, press
Hz/DUTY/WIDTH
until
Hz, kHz,
or
MHz
appears.
3.
To
select
the
duty
cycle
or
pulse
width
function, press
Hz/DUTY/WIDTH
until
% appears (to select
duty
cycle)
or
until
µS
or
mS
appears (to select pulse
width).
4.
If
%,
µS,
or
mS
appears
and
you
want
to
select
the
frequency
function
again,
press
Hz/DUTY/WIDTH
until
Hz, kHz,
or
MHz
appears.
5.
Connect
the
test
leads
to
the
device
you
want
to
check.
RadioShack.
16
Notes
:
• Ifthe function dial
is
set to
dBm /,.,., V
and
you
want to set the meterfor maximum
sensitivity when measuring a new signal,
press
SELECT
to
select the
ACV
function
then
press
Hz/DUTY/WIDTH
to select the frequency function.
•
To
change back to
ACV
measurement,
press
SELECT
once then
press
SELECT
again
to select the
AC
V,display mode
(dBm
or volts).
Press
SELECT
twice to set the meter
back to the AC A measurement function.
• Ifthe meter
is
set
to
measure current, it cannot
measure
the frequency
of
asignal with
DC bias.
Measuring
hfE
You can use
the
meter
to
measure
the
DC
gain
of
small-signal,
bipol
ar transistors
in
the
hFE
range
of
1000.
CAUTION:
To
avoid
damaging
the
meter,
do
not
try
to
check a transistor
if
you
do
not
know
its
type
and
pinout.
1. Set
the
function
dial
to
hFE.
h
FE
Socket -
Insert atransistor
2.
Unplug
both
test
leads
from
the
meter,
then
to check gain.
slide
down
the
guard
on
the
front
of
the
meter
.
3. Insert
the
transistor you
want
to
check
into
the
hFE
socket,
matching
the
pinout
of
the
transistor
with
the
labels on
the
socket. The
transistor's value appears.
RadioShack. 17

www.SteamPoweredRadio.Com
Using
the
Meter
with
a
Computer
Using
the
Meter
with
a
Computer
You
can
connect
your
meter
to
a computer,
letting
you conveniently monitor,
record, and
log
data over a
long
period
of
time.
You
can even use your
meter
to
display oscilloscope
information
on
your
computer
. For example, you can record
changes in
temperature
in a refrigerator
or
voltage
changes in a circuit over a
long
period
of
time.
System
Requirement
Windows
~
XP,
Windows
ME,
Windows
2000,
Windows
98
or
Windows
95, with all
of
the
following:
• VGA
or
SVGA vi
deo
adapter
• at least
32
MB RAM
• Microsoft-compatible mouse
Installing
the
Meter's
Software
and
Hardware
1. Turn on your
computer
and start
the
installed
Windows
operating
system.
2. Insert
the
software CD
into
your
CD
-ROM drive.
RS-232 Connector
The CD starts automatically. If
it
does
not,
browse
to
your CD-ROM drive
and
open
setup.exe.
3.
After
you finish installing
the
software, restart
your
computer
.
4.
Connect
one
end
of
the
supplied
RS
-232 cable
to
the
jack
on
top
of
the
meter,
then
connect
the
other
end
to
your computer's serial
port.
The
supplied
cable fits only
one
way.
Do
not
force
it
.
Configuring
and
Using
the
Meter
and
Software
After
connecting, you
must
configure your
meter
and
the
Meter
View software so
that
they
can
work
with each
other
.
1. Click Start, Programs, then
Meter
View
on
your
computer. The
Meter
View
software starts.
2. Turn on your
meter
. Then
hold
down
SELECT
and
RANGE
together
.
Emf)
appears.
3.
On
your computer, select
the
COM
port
where you
connected
the
meter
by
pulling
down
Option then
COM
Port,
then
clicking COM1,
COM2
,
COM3
,
or
COM4
.
RadioShack. 18
4.
Then click
the
icon ,
or
pull
down
Run
then click Start
to
set
up
the
meter
to
work
with
your
computer. Data
is
transmitted
from
your
meter
to
your
computer
. The display you see
on
the
meter
also appears
on
your
computer
.
Notes
:
•
If
you select
the
wrong
COM
port
,
an
error messqge appears. Repeat step 3
to
select
the
correct
COM
port.
• If
the
Meter
View software stops communicating with
the
meter, check
the
connection
between
the
meter
and
the
computer
and make sure
Emf)
still appears
on
the
meter's display.
• The
Meter
View software includes installation files and a
Help
Guide
.
You
can
find
more
detailed
information in
the
Help Guide.
To
read this guide, click Start,
Programs,
Meter
View, then select Help.
RadioShack.
19