Radio Shack Marine Instruments Marine Instruments User Guide

Clamp-On AC Ammeter  
with Detachable Multimeter  
 
ˆ Features  
Fuse and Diode Protection  
protect the multimeter.  
Your RadioShack Clamp-On AC Am-  
meter with Detachable Multimeter is  
— help  
— the  
designed with  
a
precision meter  
Battery Condition Testing  
multimeter shows when you need to  
replace the battery.  
movement to avoid mechanical shock  
damage. Your portable, compact mul-  
timeter is ideal for field, lab, shop,  
bench, and home applications. The  
multimeter measures DC and AC cur-  
rent, DC and AC voltage, and resis-  
tance.  
Detachable Test Leads  
— let you  
store the multimeter neatly and con-  
nect the test leads only when you  
need to use the multimeter.  
Important:  
Deluxe Carrying Case  
— protects  
your multimeter, ammeter, and test  
leads and lets you take them almost  
anywhere.  
• This multimeter is designed for  
indoor use only.  
• Completely read this manual  
before you use the multimeter.  
Your multimeter has passed the criti-  
cal safety tests required by Underwrit-  
ers Laboratories for test equipment,  
meets UL 3111 Installation Category  
1, Pollution Degree 2, and its 2000  
ohm/volt sensitivity ensures accurate  
readings.  
• If you are not familiar with multi-  
meters and testing procedures,  
we suggest you read the book  
Using Your Meter (available at  
your local RadioShack store)  
before you use this multimeter.  
Note:  
Your multimeter requires one  
Here are some features that make  
your multimeter a real pro:  
AAA battery (not supplied).  
Detachable Clamp-On AC Ammeter  
— lets you measure AC current by  
simply clamping around a wire quickly  
and safely.  
Hold Function  
— lets you easily hold  
the displayed value when measuring  
AC current, so you can see the read-  
ing even after you disconnect the am-  
meter.  
3
Features  
 
cover is in place and fully closed  
with the screw fully tightened.  
A WORD ABOUT  
SAFETY  
• 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.  
We have taken every precaution in  
designing this multimeter to ensure  
that it is as safe as we can make it.  
But safe operation depends on you,  
the operator. We recommend that  
you follow these simple safety rules:  
This multimeter is fully calibrated and  
tested. Under normal use, no further  
adjustment should be necessary ex-  
cept as noted in this Owner’s Manual.  
If the multimeter requires repair, do  
not try to adjust it yourself. Take it to  
your local RadioShack store.  
• Never apply voltages to the mul-  
timeter that exceed the limits  
given in “Specifications” on  
Page 6. Never apply more than  
500V DC or 500V RMS AC  
between any input terminals or  
between an input terminal and  
ground.  
WARNINGS:  
• USE EXTREME CAUTION IN  
THE USE OF THIS DEVICE.  
IMPROPER USE OF THIS  
DEVICE CAN RESULT IN  
INJURY OR DEATH. FOLLOW  
• Use extreme caution when work-  
ing with voltages above 40V.  
Always disconnect power from  
the circuit you are measuring  
before you connect test leads to  
high-voltage points.  
ALL  
SAFEGUARDS  
SUG-  
GESTED IN THIS OWNER’S  
MANUAL IN ADDITION TO  
NORMAL SAFETY PRECAU-  
TIONS IN DEALING WITH  
ELECTRICAL CIRCUITS. DO  
NOT USE THIS DEVICE IF YOU  
ARE UNFAMILIAR WITH ELEC-  
TRICAL CIRCUITS AND TEST-  
ING PROCEDURES.  
• Never connect the test leads to a  
source of voltage when the func-  
tion selector is set to  
R×1KΩ,  
R×100150mA DC mA  
,
, or  
ACA  
.
• Always discharge any capacitors  
of the circuit under test before  
you attach test leads.  
• NEVER TRY TO PROBE WITH  
BOTH TEST LEADS AT THE  
SAME TIME OR HOLD BOTH  
TEST LEADS IN ONE HAND.  
• Always turn off power and dis-  
connect the test leads from the  
circuit you are testing before you  
replace the multimeter’s battery.  
• USE EXTREME CARE WHILE  
USING THE MULTIMETER TO  
• Never operate the multimeter  
unless its battery compartment  
4
Features  
 
MEASURE CURRENT AND  
VOLTAGE IN COMMERCIAL  
ELECTRICAL PANELS. UNLIKE  
A HOME AC OUTLET, A COM-  
MERCIAL ELECTRICAL PANEL  
• ALWAYS WEAR PROTECTIVE  
LEATHER GLOVES, FACE  
SHIELD, AND FIREPROOF ARM  
AND UPPER BODY PROTEC-  
TION WHILE USING THE MULTI-  
A
HAS  
TREMENDOUS  
CUR-  
METER  
TO  
MEASURE  
RENT SURGE POTENTIAL.  
THIS IS ESPECIALLY TRUE  
FOR THREE-PHASE INDUS-  
TRIAL ELECTRICAL PANELS. A  
SMALL SPARK FROM ONE OF  
THESE PANELS CAN CAUSE A  
PLASMA EXPLOSION AND  
FIRE THAT CAN SEVERELY  
BURN YOU. DO NOT HOLD  
CURRENT AND VOLTAGE IN  
COMMERCIAL  
PANELS.  
ELECTRICAL  
• IF THIS EQUIPMENT IS USED  
IN A MANNER NOT SPECIFIED  
BY THE MANUFACTURER,  
THE PROTECTION PROVIDED  
BY THE EQUIPMENT MAY BE  
IMPAIRED.  
THE  
MULTIMETER  
WHILE  
USING IT.  
• TO REDUCE THE RISK OF  
FIRE OR SHOCK HAZARD, DO  
NOT EXPOSE THIS PRODUCT  
TO RAIN OR MOISTURE.  
ˆ Special Panel Markings  
For your safety, we have added special markings to the multimeter’s panel to re-  
mind you of the measurement limitations.  
500V  
MAX  
To avoid electrical shock or damage to the multimeter, do  
not connect the ground terminal (jack) to any source  
that exceeds 500 volts with respect to earth/ground.  
500V  
RMS  
MAX  
To avoid electrical shock or damage to the multimeter, do  
not connect the test leads to any source that exceeds 500  
volts RMS AC.  
Risk of electric shock! Refer to the complete  
operating instructions.  
Caution:  
!
Be extra careful when making high-voltage  
Caution:  
measurements; DO NOT TOUCH TERMINALS OR  
PROBE ENDS.  
5
Special Panel Markings  
 
ˆ Specifications  
RANGES  
AC/DC Voltage.......................................................................... 15V, 150V, 500V  
DC Current .............................................................................................. 150 mA  
AC Current ..................................................................................... 3A, 15A, 30A  
Resistance ...................................................................... 100k(Center 3.5K),  
10K(Center 350)  
ACCURACY  
DC .......................................................................................... ±3.0% of full scale  
AC .......................................................................................... ±4.0% of full scale  
Resistance ................................................................... ±3.0% at full scale length  
Sensitivity, AC/DC Voltage ............................................................... 2000 /Volt  
MISCELLANEOUS  
Operating Temperature ............................................... 32 to 109.4°F (0 to 43°C)  
Storage Temperature .................................................. –4 to 140°F (–20 to 60°C)  
Power Source ........................................................................... One AAA battery  
7
5
1
Dimensions (HWD) .......................................................... 7 / 2 / 1 / Inches  
8 ×  
8 ×  
8
(200 × 66 × 28 mm)  
Weight ........................................................................................... 8.8 oz (250 g)  
Included Accessories .......................................................................... Test leads  
AC Ammeter  
Carrying Case  
Specifications are typical; individual units might vary. Specifications are subject  
to change and improvement without notice.  
6
Specifications  
 
ˆ A Quick Look at Your Multimeter  
OHMS  
ADJUST  
(left side of  
multimeter)  
AC AMMETER  
MULTIMETER  
7
A Quick Look at Your Multimeter  
 
ˆ Preparation  
INSTALLING A  
BATTERY  
Top Cover  
Your multimeter requires one AAA  
battery (not supplied) for power. For  
the best performance and longest life,  
we recommend a RadioShack alka-  
line battery.  
Warnings:  
To avoid electrical shock, discon-  
nect both of the multimeter’s test  
leads from any equipment before  
you install or remove the multim-  
eter’s battery.  
3. Use a Phillips screwdriver to  
remove the screw on the lower  
back of the multimeter, then  
remove the multimeter’s back  
cover.  
• Do not operate your multimeter  
until the battery is properly  
installed and the back cover is in  
place and secured.  
Caution:  
Use only a fresh battery of  
the required size and recommended  
type.  
Back  
Cover  
Follow these steps to install the bat-  
tery.  
OFF  
1. Set the function selector to  
to turn off the multimeter if it is  
on, then disconnect the test  
leads if they are connected.  
2. Use a Phillips screwdriver to  
remove the screw on the upper  
back of the multimeter. Then pull  
up the top cover to remove it.  
8
Preparation  
 
4. Place the battery in the compart-  
ment as indicated by the polarity  
symbols (+ and –) marked inside.  
Plug the black test lead’s right-angled  
end into the multimeter’s (common)  
jack, then plug the red test lead’s  
right-angled end into the + jack.  
5. Replace the back cover and the  
top cover, then secure them with  
the screws.  
CONNECTING THE  
AC AMMETER TO  
THE MULTIMETER  
When you cannot adjust the needle to  
0
point to on the scale when you mea-  
Cautions:  
sure resistance (see “Measuring Re-  
sistance” on Page 16) or the  
multimeter stops operating properly,  
replace the battery.  
• Always connect the ammeter to  
your multimeter before you  
clamp the ammeter to a wire car-  
rying current.  
Warning:  
Dispose of old batteries  
promptly and properly. Do not burn or  
bury them.  
• Always unclamp the ammeter  
from  
a
wire carrying current  
Caution:  
If you do not plan to use the  
before you disconnect it from the  
multimeter.  
multimeter for a month or more, re-  
move the battery. Batteries can leak  
chemicals that can destroy electronic  
parts.  
1. Use a Phillips screwdriver to  
remove the screw on the upper  
back of the multimeter. Then pull  
up the top cover to remove it.  
CONNECTING THE  
TEST LEADS  
2. Insert the four pins on the amme-  
ter as far as they will go into the  
top of the multimeter, then gently  
press the ammeter down onto  
the top of the multimeter until it  
clicks.  
The test leads supplied with your mul-  
timeter are rated for 1000 volts. Use  
only test leads of the same rating with  
the multimeter. You can order re-  
placement leads from your local  
RadioShack store.  
WARNING:  
ALTHOUGH THE TEST  
LEADS ARE RATED FOR 1000  
VOLTS, THE MAXIMUM RATING OF  
THIS MULTIMETER IS 500 VOLTS  
DC/500 VOLTS RMS AC. DO NOT  
TRY TO MEASURE ANY VOLTAGE  
GREATER THAN 500 VOLTS DC/  
500 VOLTS RMS AC.  
9
Preparation  
 
3. Use the screw to secure the  
ammeter to the multimeter, then  
put the top cover you removed in  
Step 1 in a safe place.  
ZERO ADJUSTMENT  
If the needle does not normally rest  
exactly over 0 on the left side of the  
ACVA/DCVA  
scale, use a flat screw-  
driver to adjust the plastic screw on  
the center of the multimeter’s face to  
set the needle to 0.  
ˆ Using the Multimeter  
WARNING:  
DO NOT TRY TO MEA-  
MAKING  
SURE ANY VOLTAGE GREATER  
THAN 500 VOLTS DC/500 VOLTS  
RMS AC.  
MEASUREMENTS  
For the most accurate readings, the  
temperature should be between 43°F  
and 74°F (6°C and 23°C), with a max-  
imum of 80% relative humidity.  
Caution:  
When the multimeter is not  
in use, always leave the function se-  
lector set to  
OFF  
.
Keep the multimeter lying flat on a  
non-metallic surface. Also, use a  
range setting that results in a reading  
in the upper third of the multimeter’s  
scale.  
To use the multimeter, use the func-  
tion selector to switch between the  
multimeter’s functions. Then connect  
the test leads to the circuit you want  
to measure.  
For exact readings, look at the scale  
from an angle where the needle and  
its reflection in the mirror come to-  
gether.  
Caution:  
Be sure to select the correct  
function before you touch the test  
leads to the circuit or component to  
be tested.  
10  
Using the Multimeter  
 
MEASURING DC/AC  
VOLTAGE  
WARNINGS:  
• 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  
Note:  
If you are not sure about  
the voltage level you are measur-  
ing, set the function selector to  
500 DCV  
500 ACV  
. Then keep  
or  
MULTIMETER’S  
OTHER  
trying the next lowest range as  
necessary until the reading  
appears in the upper third of the  
multimeter’s scale.  
PROBE, YOU COULD RECEIVE  
AN ELECTRIC SHOCK.  
• THE MAXIMUM INPUT LIMIT  
FOR VOLTAGE MEASURE-  
MENT IS 500V DC OR 500V AC  
(RMS). TO AVOID ELECTRI-  
CAL SHOCK AND DAMAGE TO  
THE MULTIMETER, NEVER  
TRY TO MEASURE DC VOLT-  
AGE ABOVE 500 VOLTS OR AC  
VOLTAGE ABOVE 500 VOLTS  
RMS.  
2. Touch the test leads to the circuit  
you want to test.  
• If the function selector is set to  
500 ACV  
500 DCV  
or  
, read the  
ACVA/DCVA  
upper line of  
on  
the multimeter. The AC or DC  
voltage is the reading you see.  
For example, if the needle  
points to 200, the AC or DC  
voltage is 200 volts. Other-  
wise, read the lower line of  
• TO  
AVOID  
ELECTRICAL  
SHOCK AND DAMAGE TO THE  
MULTIMETER, NEVER CON-  
NECT THE TEST PROBE  
ACVA/DCVA  
on the multime-  
ter then multiply the reading  
you see by 500/3. For exam-  
ple, if the needle points to 2.4,  
the AC or DC voltage is 400  
volts (2.4 × 500/3 = 400V).  
PLUGGED INTO THE  
JACK  
TO A SOURCE OF VOLTAGE  
ABOVE 500 VOLTS.  
Follow these steps to measure AC or  
DC voltage.  
• If the function selector is set to  
1. Set the function selector to one  
150 ACV  
150 DCV  
or  
, read the  
DCV  
of the  
positions (to measure  
ACVA/DCVA  
lower line of  
on  
ACV  
DC voltage) or to one of the  
the multimeter then multiply  
the reading you see by 50. For  
example, if the needle points  
positions (to measure AC volt-  
age).  
11  
Using the Multimeter  
 
to 2, the AC or DC voltage is  
100 volts (2 × 50 = 100V).  
YOU DO NOT USE THIS MULTIME-  
TER FOR SUCH APPLICATIONS.  
• If the function selector is set to  
We designed this multimeter primarily  
to measure household AC voltages. If  
you want to measure 3-phase, line-to-  
line voltages, please note that the ac-  
tual voltage can be greater than the  
circuit’s rated line-to-ground voltage.  
15 DCV  
, read the lower line of  
ACVA/DCVA  
on the multime-  
ter then multiply the reading  
you see by 5. For example, if  
the needle points to 2, the DC  
voltage is 10 volts (2 × 5 =  
10V).  
Most 3-phase power circuits are rated  
by their line-to-line voltage. This volt-  
age is higher than the line (or phase)  
to ground voltage. To determine if a  
line-to-line 3-phase voltage exceeds  
the rating of this multimeter, multiply  
the rated line-to-ground voltage by  
1.732 (the square root of 3). For ex-  
ample, if the rated line-to-ground volt-  
age is 300 volts, the line-to-line  
voltage is 300 × 1.732 = 519.6 V AC.  
• If the function selector is set to  
15 ACV  
AC15V  
line  
, read the  
on the multimeter. For exam-  
ple, if the needle points to 10,  
the AC voltage is 10 volts.  
Hint:  
When you use the multimeter to  
probe for a voltage in a high-voltage  
circuit, we recommend you do not try  
to position both test leads at once. In-  
stead, use an insulated alligator clip  
(not supplied) to clamp one test lead  
to the circuit's neutral or ground lead  
(usually a bare, green, or white lead  
in AC wiring circuits). Then place your  
free hand in your pocket or behind  
your back and probe for voltages with  
the other test lead. This helps prevent  
you from accidentally touching a hot  
wire, since you need only concentrate  
on one test lead.  
Warning:  
This voltage exceeds the  
multimeter’s rating. Therefore, you  
should not connect the multimeter to  
this circuit or to any equipment con-  
nected to the circuit. Doing so could  
present a dangerous shock hazard to  
you, and could also damage the mul-  
timeter.  
If you do not know why there is a volt-  
age difference, you should not be  
working on three-phase power cir-  
cuits. These circuits are generally ex-  
tremely powerful and very dangerous.  
Special safety equipment should be  
worn when working around these  
dangerous circuits.  
Measuring Three-Phase AC  
Voltage  
WARNING:  
BECAUSE OF THE  
DANGERS INHERENT IN MEASUR-  
ING THREE-PHASE CIRCUITS, WE  
STRONGLY RECOMMEND THAT  
12  
Using the Multimeter  
 
2. Disconnect the test leads from  
the circuit.  
Measuring AC Voltage  
Riding on a DC Source Bias  
3. Remove power from the circuit  
under test and discharge all  
capacitors.  
To measure AC voltage superim-  
posed on a DC voltage source bias  
while ignoring the DC voltage, you  
must first measure the AC and DC  
voltages separately, then compute  
the peak voltage using this formula:  
4. Set the function selector to one  
ACV  
of the  
positions. Then con-  
nect a 0.1 microfarad/100V poly-  
ester film capacitor in series with  
the positive terminal of the volt-  
age source and the red test lead.  
Peak voltage = DC voltage + AC volt-  
age/0.707  
WARNINGS:  
5. Connect the  
(common) test  
lead to ground and note the read-  
ing on the upper or lower line of  
• TO AVOID INJURY OR DAM-  
AGE TO YOUR MULTIMETER,  
NEVER TRY TO MEASURE AN  
AC VOLTAGE THAT IS RIDING  
ACVA/DCVA  
on the multimeter.  
The multimeter shows the AC  
voltage.  
ON  
A
DC SOURCE BIAS  
WHERE THE PEAK VOLTAGE  
Warning:  
shock, never touch the circuit  
and test terminals while testing.  
To avoid electric  
EX-CEEDS  
RESPECT  
GROUND.  
100V  
TO  
WITH  
EARTH  
6. When you finish measuring the  
AC voltage, disconnect the  
power from the circuit under test  
then disconnect the capacitor  
you connected in Step 4.  
• TO AVOID INJURY OR DAM-  
AGE TO YOUR MULTIMETER,  
NEVER TRY TO MEASURE  
ANY VOLTAGE MORE THAN  
30V AC ON A DC SOURCE  
BIAS.  
MEASURING CURRENT  
Follow these steps to measure an AC  
voltage superimposed on a DC volt-  
age source bias.  
Measuring DC Current  
WARNING:  
AGE TO THE TEST LEADS WHILE  
THE FUNCTION SELECTOR IS SET  
DO NOT APPLY VOLT-  
1. Set the function selector to one  
DCV  
of the  
positions. Then touch  
the test leads to the circuit you  
want to test and note the reading  
on the upper or lower line of  
150mA DC mA  
TO  
. THE CONNEC-  
TION MUST BE IN SERIES WITH  
THE CURRENT.  
ACVA/DCVA  
on the multimeter.  
13  
Using the Multimeter  
 
150  
1. Set the function selector to  
mA DC mA  
.
2. Remove power from the circuit  
under test and discharge all  
capacitors.  
3. Break the electrical path for the  
circuit in which you want to mea-  
sure current. Then connect the  
(common) test lead to the nega-  
tive side and the positive (+) test  
lead to the positive side of the  
circuit.  
4. Apply power to the circuit.  
ACVA/  
5. Read the lower line of  
DCVA  
on the multimeter, then  
multiply that reading by 50 to  
compute the current.  
1. Connect the ammeter to the mul-  
timeter (see “Connecting the AC  
Ammeter to the Multimeter” on  
Page 9).  
For example, if the needle points  
to 2, the DC current is 2 × 50 =  
100mA. If the needle points to 1,  
the DC current is 1 × 50 = 50mA.  
ACA  
2. Set the function selector to  
.
T/3A/  
3. Test the ammeter by sliding  
Measuring AC Current in a  
Wire  
15A/30A  
T
on the ammeter to  
then reading the line below  
AC15V  
,
on the multimeter.  
WARNING:  
DO NOT APPLY VOLT-  
AGE TO THE TEST LEADS WHILE  
THE FUNCTION SELECTOR IS SET  
GOOD  
If the needle points to  
on  
the multimeter, the ammeter is  
working. Skip to Step 4. If the  
ACA  
TO  
.
FAIL  
needle points to  
on the mul-  
Important:  
Make sure you place only  
timeter, check the multimeter’s  
battery (see “Installing a Battery”  
on Page 8), then repeat Step 3. If  
one wire inside the ammeter's jaws at  
a time. If you try to measure AC cur-  
rent in more than one wire at a time,  
such as an AC power cord of a  
household appliance, the measure-  
ment will not be accurate.  
FAIL  
the needle points to  
again,  
take the multimeter to your local  
RadioShack store.  
14  
Using the Multimeter  
 
4. Hold down the trigger lever on  
the ammeter. The ammeter’s  
jaws open. Then insert the wire  
you are measuring inside the  
probe's jaws and release the trig-  
ger lever.  
6. To help ensure an accurate read-  
ing, move the probe so the wire  
is in the center of the open area  
inside the jaws.  
ACVA/  
7. Read the lower line of  
DCVA  
on the multimeter.  
T/3A/15A/30A  
• If  
on the ammeter is  
3A  
set to  
, the AC current is the  
reading you see. For example, if  
2
the needle points to , the AC  
current is 2 amps.  
T/3A/15A/30A  
• If  
on the ammeter is  
15A  
set to  
, multiply that reading  
by 5 to compute the current. For  
example, if the needle points to  
2
×
, the AC current is 10 amps (2  
5 = 10A).  
T/3A/15A/30A  
• If  
on the ammeter is  
30A  
set to  
, multiply that reading  
by 10 to compute the current. For  
example, if the needle points to  
2
×
, the AC current is 20 amps (2  
10 = 20A).  
T/3A/15A/30A  
5. Slide  
ter to  
on the amme-  
3A 15A  
30A  
(to measure  
,
, or  
HOLD  
8. Press  
on the ammeter to  
current).  
HOLD  
HOLD  
HOLD  
hold the reading you see.  
clicks and stays in. Press  
again to release hold.  
clicks and pops out.  
Note:  
If you are not sure about  
the current level you are measur-  
ing, slide  
T/3A/15A/30A  
on the  
30A  
ammeter to  
. Then keep try-  
9. When you finish measuring cur-  
rent, set the function selector to  
ing the next lowest range as nec-  
essary until the reading appears  
on the lower line of  
on the multimeter.  
OFF  
.
Then remove the AC  
ACVA/DCVA  
ammeter from the multimeter and  
secure the top cover and back  
cover with the screws.  
15  
Using the Multimeter  
 
Caution:  
Never connect the test  
MEASURING WATTAGE  
leads to a source of voltage when the  
You can use the multimeter and am-  
meter to tell how many watts of power  
an appliance uses. This helps you de-  
termine what the electricity costs are  
for that appliance.  
function selector is set to  
R×1KΩ  
or  
R×100Ω  
.
Note:  
When you measure the resis-  
tance of a component in a circuit, dis-  
connect one side of the component  
you are testing. This prevents other  
components in the circuit from inter-  
fering with the reading.  
The following formula can help you  
make the necessary conversion.  
×
V (volts) A (amps) = W (watts)  
Follow these steps to measure resis-  
tance.  
To determine how many watts an ap-  
pliance uses, use your multimeter to  
measure the number of volts it uses  
(120 volts single-phase AC is stan-  
dard for most household appliances)  
then connect the ammeter to the mul-  
timeter and use both to measure the  
current it uses. Then multiply those  
numbers. For example, if your air  
conditioner uses 120 volts and you  
measured 10 amps, it uses 1,200  
watts.  
1. Set the function selector to  
R×1KΩ  
or  
R×100Ω  
.
2. Touch the test leads together,  
OHMS ADJUST  
then rotate  
on the  
side of the multimeter until the  
0
needle points to on the top line  
on the multimeter.  
3. Touch the test leads across the  
circuit you want to measure, or  
remove one of the leads of the  
component you want to measure  
from its circuit and touch the test  
leads across the component.  
MEASURING  
RESISTANCE  
The resistance measuring circuit in  
your multimeter compares the voltage  
gained through a known resistance  
(internal) with the voltage developed  
across an unknown resistance.  
OHMS  
Then read the top  
the multimeter.  
line on  
• If the function selector is set to  
R×100Ω  
, multiply that reading by  
100 to compute the resistance.  
For example, if the needle points  
WARNING:  
BE SURE THE CIRCUIT  
UNDER TEST HAS ALL POWER  
REMOVED AND ANY ASSOCIATED  
CAPACITORS ARE FULLY DIS-  
CHARGED BEFORE YOU MAKE A  
RESISTANCE MEASUREMENT.  
1
to , the resistance is 100 ohms  
(1 × 100 = 100).  
16  
Using the Multimeter  
 
Hint:  
• If the function selector is set to  
R×1KΩ  
If you are identifying cathode  
, multiply that reading by  
1000 to compute the resistance.  
For example, if the needle points  
and anode ends or the type of transis-  
tor (PNP or NPN), the actual polarity  
of the multimeter's voltage is the op-  
posite of the polarity suggested by the  
test probes' color. The red test probe  
is the negative source, and the black  
test probe is the positive source.  
1
to , the resistance is 1000 ohms  
(1 × 1000 = 1000).  
ˆ Care  
Keep the multimeter dry; if it gets wet,  
wipe it dry immediately. Use and  
store the multimeter only in normal  
temperature environments. Handle  
the multimeter carefully; do not drop  
it. Keep the multimeter away from  
dust and dirt.  
CLEANING  
To keep the multimeter looking new,  
occasionally wipe it with a cloth slight-  
ly dampened with water. Do not use  
harsh chemicals, cleaning solvents,  
or strong detergents to clean the mul-  
timeter.  
Modifying or tampering with the multi-  
meter’s internal components can  
cause a malfunction and might invali-  
date its warranty. If your multimeter is  
not performing as it should, take it to  
your local RadioShack store for assis-  
tance.  
WARNINGS:  
• DO NOT LET ANY WATER DRIP  
INSIDE THE MULTIMETER  
WHILE CLEANING IT.  
• MAKE SURE THAT THE MULTI-  
METER IS COMPLETELY DRY  
BEFORE USING IT.  
17  
Care  
 
6. If the fuse is blown, discard it and  
save the ribbon (to use with the  
next spare fuse you store in the  
compartment). Then remove the  
spare fuse and the ribbon hold-  
ing it from the upper back of the  
multimeter and insert it into the  
fuse holder.  
REPLACING THE FUSE  
If the multimeter does not work, you  
might need to replace the fuse with  
the supplied 315 mA, 250V ceramic  
fuse. The spare fuse is next to the  
battery compartment.  
Caution:  
Do not use a fuse with rat-  
ings other than those specified here.  
Doing so might damage your multim-  
eter.  
7. Replace the battery in the com-  
partment.  
Warning:  
Do not operate your  
Follow these steps to replace the  
fuse.  
multimeter until the back cover  
and top cover are in place and  
secured.  
OFF  
1. Set the function selector to  
,
then disconnect the test leads if  
they are connected.  
8. Replace the back cover and the  
top cover, then secure them with  
the screws.  
WARNING:  
TO AVOID ELEC-  
TRIC SHOCK, YOU MUST DIS-  
CONNECT THE TEST LEADS  
BEFORE YOU REMOVE THE  
BACK COVER.  
2. Use a Phillips screwdriver to  
remove the screw on the upper  
back of the multimeter. Then  
remove the top cover.  
3. Use a Phillips screwdriver to  
remove the screw on the lower  
back of the multimeter, then  
remove the multimeter’s back  
cover.  
4. Remove the battery.  
5. To remove the fuse, gently pull  
the red ribbon holding it. The  
fuse pops out.  
18  
Care  
 
ˆ Notes  
19  
Notes  
 
Limited Ninety-Day Warranty  
This product is warranted by RadioShack against manufacturing defects in material and work-  
manship under normal use for ninety (90) days from the date of purchase from RadioShack com-  
pany-owned stores and authorized RadioShack franchisees and dealers. EXCEPT AS  
PROVIDED HEREIN, RadioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED  
WARRANTIES, INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICU-  
LAR PURPOSE, ARE LIMITED IN DURATION TO THE DURATION OF THE WRITTEN LIMITED  
WARRANTIES CONTAINED HEREIN. EXCEPT AS PROVIDED HEREIN, RadioShack SHALL  
HAVE NO LIABILITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR  
ENTITY WITH RESPECT TO ANY LIABILITY, LOSS OR DAMAGE CAUSED DIRECTLY OR IN-  
DIRECTLY BY USE OR PERFORMANCE OF THE PRODUCT OR ARISING OUT OF ANY  
BREACH OF THIS WARRANTY, INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES RE-  
SULTING FROM INCONVENIENCE, LOSS OF TIME, DATA, PROPERTY, REVENUE, OR  
PROFIT OR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,  
EVEN IF RadioShack HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.  
Some states do not allow limitations on how long an implied warranty lasts or the exclusion or lim-  
itation of incidental or consequential damages, so the above limitations or exclusions may not ap-  
ply to you.  
In the event of a product defect during the warranty period, take the product and the RadioShack  
sales receipt as proof of purchase date to any RadioShack store. RadioShack will, at its option,  
unless otherwise provided by law: (a) correct the defect by product repair without charge for parts  
and labor; (b) replace the product with one of the same or similar design; or (c) refund the pur-  
chase price. All replaced parts and products, and products on which a refund is made, become  
the property of RadioShack. New or reconditioned parts and products may be used in the perfor-  
mance of warranty service. Repaired or replaced parts and products are warranted for the re-  
mainder of the original warranty period. You will be charged for repair or replacement of the  
product made after the expiration of the warranty period.  
This warranty does not cover: (a) damage or failure caused by or attributable to acts of God,  
abuse, accident, misuse, improper or abnormal usage, failure to follow instructions, improper in-  
stallation or maintenance, alteration, lightning or other incidence of excess voltage or current; (b)  
any repairs other than those provided by a RadioShack Authorized Service Facility; (c) consum-  
ables such as fuses or batteries; (d) cosmetic damage; (e) transportation, shipping or insurance  
costs; or (f) costs of product removal, installation, set-up service adjustment or reinstallation.  
This warranty gives you specific legal rights, and you may also have other rights which vary from  
state to state.  
RadioShack Customer Relations, 200 Taylor Street, 6th Floor, Fort Worth, TX 76102  
12/99  
We Service What We Sell  
22-602  
01A01  
Printed in China  
RadioShack Corporation  
Fort Worth, Texas 76102  
 

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