Related Manuals for Radio Shack 22-218
Summary of Contents for Radio Shack 22-218
- Page 1 22-218 Cat. No. OWNER’S MANUAL Please read before using this equipment. 8-Range Multitester...
- Page 2 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.
- Page 3 • 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...
- Page 4 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: •...
- Page 5 • 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.
- Page 6 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 nearest Radio Shack store. Service by unauthorized per- sonnel voids the warranty.
- Page 7 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.
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Page 8: Specifications
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... - Page 9 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 ... 3 ¥ 2 ¥ 1 Inches (98 ¥ 64 ¥ 32 mm) (HWD) Weight... Approx. 3.7 oz. (105 g)
- Page 10 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. 500V To avoid electric shock or damage to the meter, do not connect the ground terminal to any source of more than 500 volts with respect to earth ground.
- Page 11 Be extra careful when you take measurements for high voltage. Do not touch the meter’s test probe ends.
- Page 12 INSTALLING A BATTERY Your meter uses one AA battery for power. 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.
- Page 13 Follow these steps to install the battery. 1. Set the function selector to 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. and remove the test...
- Page 14 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.
- Page 15 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 REPLACE THE FUSE AND CLOSE THE BACK COVER.
- Page 16 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.
- Page 17 1. Set the function selector to 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.
- Page 18 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...
- Page 19 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.
- Page 20 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 range setting that results in a reading in the upper third of the meter scale.
- Page 21 For exact readings, look at the scale from the point where the pointer and its reflection in the mirror come together.
- Page 22 Zero Adjustment If the pointer does not normally rest exactly over at the left side of the scale, adjust the plastic screw in the ACV/DC.VMA center of the tester face to bring the pointer to zero. MEASURING VOLTAGE WARNING: IF YOU ATTEMPT TO MEASURE A VOLTAGE GREATER THAN 1000 VOLTS DC OR AC, YOU MIGHT DAMAGE YOUR METER AND EXPOSE YOURSELF TO A SEVERE SHOCK HAZARD.
- Page 23 When you measure voltage in a high-voltage circuit, do not try to position both probes at once. Clamp one of the probes to the circuit’s neutral or ground lead using a Radio Shack insu- lated slip-on alligator clip (Cat. No. 270-354). Then probe for voltages with the other probe.
- Page 24 Note: In AC wiring circuits, the ground lead is usually a bare, green, or white lead and the hot wire is usually red, black, or blue. In DC wiring circuits, the ground lead is usually a black lead; the hot wire is usually red. WARNING: NEVER CLAMP ONTO A HOT WIRE.
- Page 25 Measuring DC Voltage WARNING: IF YOU ATTEMPT TO MEASURE A VOLTAGE ABOVE 1000 VOLTS DC, YOU MIGHT DAMAGE YOUR METER AND EXPOSE YOURSELF TO A SEVERE SHOCK HAZARD.
- Page 26 1. Set the function selector to one of the Note: If you are not certain about the voltage level, start with the 1000 DC V range. Then try the next lowest range until the reading appears in the upper third of the meter scale.
- Page 27 Measuring AC Voltage WARNING: IF YOU ATTEMPT TO MEASURE A VOLTAGE GREATER THAN 1000 VOLTS AC, YOU MIGHT DAMAGE THE METER AND EXPOSE YOURSELF TO A SEVERE SHOCK HAZARD.
- Page 28 1. Set the function selector to one of the Note: If you are not certain about the voltage level, start with the 1000 AC V range. Then try the next lowest range until the reading appears in the upper third of the meter scale.
- Page 29 Measuring 3-Phase AC Voltage This meter is primarily designed to measure household AC voltages and is not intended for commercial or industrial use. If you want to measure 3-phase, line-to-line voltages, please note the following: • Because of the dangers inherent in the measurement of three-phase circuits, we strongly recommend against the use of this meter for such applications.
- Page 30 To determine the line-to-line voltage, multiply the rated line-to- ground voltage by 1.732. For example, if the rated voltage is 600 volts, the line-to-line voltage would be: 600 Volts x 1.732 = 1039.2 Volts In this example, the voltage exceeds the meter’s range and should not be measured.
- Page 31 Measuring AC Voltage on a DC Source Bias WARNING: NEVER MEASURE MORE THAN 30 VOLTS AC ON A DC SOURCE BIAS. When an AC voltage has been superimposed on a DC source bias, you cannot take ordinary measurements. The readings wander on the scale and are not accurate.
- Page 32 MEASURING DC CURRENT WARNING: NEVER CONNECT THE TEST LEADS TO A SOURCE OF UNKNOWN VOLTAGE WHEN YOU HAVE SET THE FUNCTION SELECTOR TO THE 150 mA DC POSI- TION. 1. Set the function selector to 150 mA DC...
- Page 33 2. Break the electrical path for the circuit in which you want to measure current. Then connect the black test probe to the negative side and the red test probe to the positive side of the circuit. Read the results on the scale.
- Page 34 MEASURING RESISTANCE WARNINGS: • NEVER CONNECT THE TEST LEADS TO A SOURCE OF VOLTAGE WHEN YOU HAVE SET THE FUNCTION SELECTOR TO THE • BE SURE THAT THE CIRCUIT UNDER TEST HAS ALL POWER REMOVED AND THAT ANY ASSOCIATED CAPACITORS ARE FULLY DISCHARGED BEFORE YOU MAKE A RESISTANCE MEASUREMENT.
- Page 35 1. Disconnect power from the circuit you are testing. Then unplug the power cord and remove any batteries. 2. Set the function selector to together and adjust the pointer to the “ ” position on the scale. 3. Touch the probes across the circuit or component you are testing.
- Page 36 Notes: • When you measure the resistance of a component in a circuit, disconnect one side of the component you are testing. This prevents other components in the circuit from interfering with the reading. • When you try to identify cathode and anode ends or the type of transistor (PNP or NPN), the actual polarity of the meter’s voltage is the opposite of the polarity suggested by the test probes’...
- Page 37 MAINTENANCE Your Radio Shack 8-Range Multitester is an example of supe- rior design and craftsmanship. The following suggestions will help you care for the meter so you can enjoy it for years. • Keep the meter dry. If it gets wet, wipe it dry immediately.
- Page 38 • Handle the meter gently and carefully. Dropping it can damage the circuit boards and can cause it to work improperly. • Keep the meter away from dust and dirt, which can cause premature wear of parts. • Wipe the meter with a damp cloth occasionally to keep it looking new.
- Page 39 Modifying or tampering with the meter’s internal components can cause a malfunction and might invalidate its warranty. If your meter is not performing as it should, take it to your local Radio Shack store for assistance.