Radio Shack 22-218 User manual

Cat. No. 22-218
OWNER’S MANUAL
Please read before using this equipment.
8-Range Multitester
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FEATURES
Your Radio Shack 8-Range Multitester is a perfect addition to
your workshop. It is designed with a precision meter move-
ment to avoid mechanical shock damage. This compact-sized
pocket meter accurately measures AC and DC voltages, DC
current, and resistance.
It also passes the critical safety test required by Underwriters
Laboratories for test equipment, and its 2000 ohm/volt sensi-
tivity ensures an accurate reading.
©1995 Tandy Corporation.
All Rights Reserved.
Radio Shack is a registered trademark used by Tandy Corporation.
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Cautions:
• Read this manual completely before you use the meter.
• If you are not familiar with meters and testing proce-
dures, we suggest that you read a book about the sub-
ject, such as “Using Your Meter” (Radio Shack Cat. No.
62-2039).
Note: You need one AA battery (not supplied) to power your
multitester.
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A WORD ABOUT SAFETY
We have taken every precaution in designing this meter to en-
sure that it is as safe as possible. But safe operation depends
on you, the operator. We recommend that you follow these
simple safety rules:
• Never apply voltages to the meter that exceed the limits
given in the specifications. Never apply more than 1000V
DC or AC between any input terminals, or between an
input terminal and ground.
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• Use extreme caution when you work with voltages above
40V. Always disconnect power from the circuit you are
measuring before you connect test probes to high-volt-
age points.
• Never connect the test probes to a source of voltage
when you select the Rx1K W or 150mA DC function.
• Always discharge filter capacitors in the power supply of
the circuit under test before you attach test probes.
• Always turn off power and disconnect the test leads
before you replace the batteries.
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• Never operate the meter unless the battery cover is in
place and fully closed.
• Because many AC/DC sets have a potentially hot chas-
sis, be sure the top of your workbench and the floor
underneath it are made of non-conductive materials.
The multitester is fully calibrated and tested. Under normal
use, no further adjustment should be necessary. If the meter
should require repair, do not try to adjust it yourself. Take it to
your nearestRadio Shack store. Service by unauthorized per-
sonnel voids the warranty.
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WARNING: USE EXTREME CAUTION IN USE OF THIS DE-
VICE. IMPROPER USE OF THIS DEVICE CAN RESULT IN
INJURY OR DEATH. FOLLOW ALL SAFEGUARDS SUG-
GESTED IN THE OWNER’S MANUAL IN ADDITION TO
NORMAL SAFETY PRECAUTIONS IN DEALING WITH
ELECTRICAL CIRCUITS. DO NOT USE THIS DEVICE IF
YOU ARE UNFAMILIAR WITH ELECTRICAL CIRCUITS
AND TESTING PROCEDURES. NOT FOR COMMERCIAL
OR INDUSTRIAL USE.
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SPECIFICATIONS
Ranges
AC Voltage ................................................ 15V, 150V, 1000V
DC Voltage ................................................ 15V, 150V, 1000V
DC Current .................................................................150 mA
Resistance ...............................100K ohm (Center 3.5K ohm)
Accuracy
DC..............................................................± 3% of Full Scale
AC .............................................................± 4% of Full Scale
Resistance .....................................± 3% at Full Scale Length
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Sensitivity
AC Voltage .......................................................2000 ohm/Volt
DC Voltage ......................................................2000 ohm/Volt
Operating Temperature......................... 32–109.4°F (0–43°C)
Storage Temperature ......................... –4–140°F (–20–60°C)
Power Requirements.................................................1.5 Volts
Dimensions........................................ 37/8¥ 21/2¥ 11/4Inches
(98 ¥ 64 ¥ 32 mm) (HWD)
Weight.................................................Approx. 3.7 oz. (105 g)
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SPECIAL PANEL MARKINGS
We have added special markings to the panel to remind you
of the meter’s measurement limitations and important safety
precautions.
Follow the operating instructions given in this
owner’s manual.
To avoid electric shock or damage to the meter,
do notconnect the ground terminalto any source
of more than 500 volts with respect to earth
ground.
!
500V
MAX
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Be extra careful when you take measurements for
high voltage. Do not touch the meter’s test probe
ends.
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INSTALLING A BATTERY
Your meter uses one AA battery forpower. We recommend an
alkaline battery, such as Radio Shack Cat. No. 23-552/557.
WARNINGS:
• TO AVOID ELECTRIC SHOCK, DISCONNECT BOTH
TEST LEADS FROM ANY EQUIPMENT BEFORE YOU
REMOVE THE BATTERY.
• DO NOT OPERATE THE METER UNTIL YOU
REPLACE THE BATTERY AND CLOSE THE BACK
COVER.
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Follow these steps to install the battery.
1. Set the function selector to OFF and remove the test
leads from all test circuits.
2. Use a Phillips screwdriver to remove the screw on the
back of the meter.
3. Remove the back of the meter.
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4. Replace the weak battery with a fresh one, following the
correct polarity (+ and –).
5. Replace the back and secure it with the screw.
Note: If you cannot adjust the pointer to “0” on the scale when
you measure resistance (see “Measuring Resistance”), it is
time to replace the battery.
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REPLACING THE FUSE
Your meter is protected by a 315 mA fuse.
WARNINGS:
• TO AVOID ELECTRIC SHOCK, DISCONNECT BOTH
TEST LEADS FROM ANY EQUIPMENT BEFORE YOU
REMOVE THE FUSE.
• DO NOT OPERATE THE METER UNTIL YOU
REPLACE THE FUSE AND CLOSE THE BACK
COVER.
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CAUTION: FOR CONTINUED PROTECTION AGAINST
FIRE OR OTHER HAZARD, REPLACE THE FUSE ONLY
WITH A 315 mA, 250 V, 5 X 20 MM MINIATURE FUSE (CAT.
NO. 270-1046).
Follow these steps to replace the fuse.
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1. Set the function selector to OFF and remove the test
leads from all test circuits.
2. Use a Phillips screwdriver to remove the screw on the
back of the meter.
3. Remove the back of the meter.
4. Replace the blown fuse with a new one.
5. Replace the back and secure it with the screw.
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OPERATION
Cautions:
• Use only the same type of test leads that are supplied
with your meter. These test leads are rated for 1000
volts. Replacements are available at your local Radio
Shack store.
• When the meter is not in
use, always leave the
function selector set to
OFF.
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Warnings:
• Do not try to measure any voltage over the meter’s rat-
ing. Use extreme care when you use these high-voltage
ranges.
• Never connect the probe you plug into the negative (–)
terminal to a source of voltage more than 500 V. Doing
so can create a serious shock hazard.
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MAKING ACCURATE MEASUREMENTS
For the most accurate reading, the temperature should be be-
tween 43°F and 74°F (6°C and 23°C) with an 80% maximum
relative humidity.
Keep the meter lying flat on a non-metallic surface. Also, use
a rangesetting thatresults in a reading in the upper third of the
meter scale.
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