24-Range LCD Digital Multimeter
Contents
1. 5 in last digit 5 in last digit 5 in last digit 3 5 of reading 3 0 of full scale 5 in last digit 9 RESISTANCE 400 0 4 40 400 KQ 4 MQ occccccccccccnnnnnnononcccncnnncnnnnnnnnnnnnncc cnc cnnnnnnnnnnnno 1 0 of reading 0 5 of full scale 3 in last digit A AR 3 5 of reading 3 0 of full scale 5 in last digit CONTINUITY TEST The continuity buzzer sounds at less than 50 Q DIODE TEST The diode test measures whether a semiconductor is open shorted or normal COMMUNICATION Transmission Rate usina iia de 600 baud GharacterGodIN Lirica ici illa iia is tus 7 bit ASCII Rarity Bla A A AAA AA Ad None SIOP Bits ta a arrest Mee Pb ie kasi tel ei 2 dC alce RS232 Serial 10 MISCELLANEOUS Dil ii A ias LCD 33 4 digit maximum bargraph Range Selectionms aiic alain Auto or manual range selection Poltica dardo reaa Tete tees cita Automatic polarity selection Input limpedance innie eed eae ein 10 MQ at DCV and ACV ranges Low Battery Indicator 20 0 eeseeeeseeeeseeeeeeneeeeees appears when battery voltage drops below operating voltage of 3 0 V Overrange Indication oo eee eeteeeeeeeseeeeteeteeeeeteeeeaeetaees OL overload appears the bargraph flashes and the meter beeps Operating Temperature acciona eel ee ee ee ede ete 32 to 104 F 0 to 40 C Storage Temperature voii ee ei ni ae ed A 14 to 122 F 20 to 60 C POWEr SOURCES O TAO One 9V battery Dimensions HWD cccscsssssss2. If both values are very small or zero the device is shorted Notes When you test a silicon type semiconductor the values might vary depending on the temperature The values that appear during a diode check show the actual forward voltage max 2 0V If the voltage exceeds 2 0V OL appears This means the diode check cannot be made using this meter 24 Checking Diode Polarity Many diodes have a stripe or mark on one side The marked side of the diode indicates the diode s cathode or negative side The other side is the anode or positive side Cathode Diode Anode y po e If a diode is not marked you can use your meter to check the diode s polarity As you follow the steps under Checking Di odes on Page 23 connect the red test lead to one side connect the black test lead to the other side then measure and note the voltage Then reverse the test leads and 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 25 USING THE METER WITH A COMPUTER You can connect your meter to an IBM or compatible PC equipped with a serial port using the industry standard 9 pin D subminiature connector CONNECTING THE METER TO A COMPUTER To connect the meter to your computer open the RS 232C port cover on top of the meter connect the supplied RS 232C cable between the meter s and computer s serial ports then turn on the me
3. If you have not already done so plug the black test lead s right angled end into COM and the red test lead s right angled end into the V Q jack 22 4 Touch the test leads across the circuit you want to measure The buzzer sounds if the circuit resistance is less than about 50 ohms meaning the circuit is continuous or shorted aum i CHECKING DIODES This procedure lets you check diodes transistors and other semiconductors for opens shorts and normal operation It also lets you determine the forward voltage and polarity for diodes This is handy when you need to match a diode You can also check LEDs using this procedure Caution Do not connect the test leads to a source of voltage with the selector set to we This could damage the meter or the circuit being tested 1 Remove all power from the circuit under test and discharge all capacitors 2 Set the selector to 3 If you have not already done so plug the black test lead s right angled end into COM and the red test lead s right angled end into the V Q jack 23 4 Connect the test leads to the device you want to check or remove one of the leads of the component you want to measure from its circuit and connect the test leads to the component 5 Reverse the test leads and note the second reading e lf one reading shows a value and the other is overrange OL appears the device is good lf OL appears during both readings the device is open
4. If you want to measure 3 phase line to line voltag es please note the following Because of the dangers inherent in measuring three phase circuits we strongly recommend you do not use this meter for such applications The actual voltage can be greater than the circuit s rated line to ground voltage Most 3 phase power circuits are rated by their line to line voltage This voltage 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 meter multiply the rated line to ground voltage by 1 732 the square root of 3 For example if the rated line to ground voltage is 462 volts the line to line voltage is 462 x 1 732 800 V AC This voltage exceeds the meter s rating Therefore you should not connect the meter to this circuit or to any equipment connected to the circuit Doing so could present a dangerous shock hazard to you and could also damage the meter MEASURING CURRENT To measure AC or DC 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 19 Warning The meter s internal components might become dangerously hot if you measure current in the 20A DC AC range Make measurements within 30 seconds after you connect the meter to the circuit and allow the meter to cool for 15 minutes between measurements Cautions Never connect the test leads across
5. current measurement range To turn on range hold press R H R H range hold appears and the meter holds the current measurement range Then re peatedly press R H to increase or decrease the range The displayed range changes as you press R H To cancel range hold hold down R H R H disappears 17 MAKING MEASUREMENTS 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 meter s other probe you could receive an electric shock The maximum input limit for voltage measurement is 1000V DC or 750V AC RMS To avoid electrical shock and damage to the meter never try to measure a DC voltage above 1000 volts or an AC voltage above 750 volts RMS Follow these steps to measure AC or DC voltage 1 Press ON OFF to turn on the meter if it is not already on 2 Set the selector to y to measure DC voltages or my to measure AC voltages 3 Touch the test leads to the circuit you want to test When you measure AC voltages AC appears on the left side of the display and v or mv appear on the right side When you measure DC voltages only v or mv appears on the right side of the display Note If the polarity of the voltage you are testing is negative A appears on the left side of the display 18 MEASURING THREE PHASE AC VOLTAGE We designed this meter primarily to measure household AC voltages
6. Cat No 22 805 OWNER S MANUAL Please read before using this equipment 24 Range LCD Digital Multimeter RadioShack FEATURES Your RadioShack 24 Range LCD Digital Multimeter is a portable compact multimeter that is ideal for field lab shop bench and home applications Its 33 4 digit digital display means it can display up to 3 999 units The meter measures DC and AC current up to 20 A voltage up to 1000V DC and 750V AC and resistance up to 40 MQ Important Completely read this manual before you use the meter e If you are not familiar with multimeters and testing procedures we suggest you read the book Using Your Meter available at your local RadioShack store before you use this meter Here are some features that make your new multimeter a real pro Computer Interface and Software lets you connect your meter to your PC compatible computer with the supplied MS DOS or Microsoft Windows 3 1 95 or 98 software so you can log and graph measurements Data Hold Function the meter holds the displayed value so you can see the reading even after you disconnect the probes Analog Bargraph Display indicates the magnitude of the input compared to the full scale value of the measurement range Overload and Transient Protection helps protect the meter from overvoltage in most ranges 1999 Tandy Corporation All Rights Reserved RadioShack is a registered trademark used by Tandy Corporation Aut
7. a voltage source Doing so can damage the meter or the circuit under test The maximum input limit for AC DC current measurement is 400 mA if you connect the red test lead to mA or 20 A if you connect the red test lead to 20A If you do not know the amount of current in the circuit you are measuring always set the selector to 294 and connect the red test lead to 20A Follow these steps to measure AC or DC current 1 Set the selector to OA 400 ma Or anh to measure DC current or 204 400mA gt Or 4ma to measure AC current 2 If you have not already done so plug the red test lead s right angled end into 400 mA if you are measuring 400 mA or less of current or 20A if you are measuring more than 400 mA of current wm Connect the meter s test leads in series with the circuit S Apply power and read the current 20 Notes If you set the selector to A 5 OS or Ama and the polarity of the voltage you are testing is negative mu appears on the left side of the display The 20A range is fuse protected If the meter does not show a reading in this range check the fuse see Replacing the Fuses on Page 32 MEASURING RESISTANCE The resistance measuring circuit in your meter compares the voltage gained through a known resistance internal with the voltage developed across an unknown resistance Warning Be sure the circuit under test has all power removed and any associated capacitors are fully disch
8. ange to the GRAPHIC subdirectory on the diskette and type RS then press Enter To stop the program or to escape from a device I O error press CTRL BREAK Using the Windows Software Notes Your computer must have Microsoft Windows 3 1 or later and a VGA or EGA monitor to use the Windows software The following steps assume that a user has a basic knowledge of Microsoft Windows Refer to your computer s Win dows user s guide for information about using Windows Refer to the README TXT file in the SCOPE subdirectory included on the diskette for hints on operating your meter The following example shows how to use the Windows software using Windows 95 If you have Windows Version 3 1 or Windows 98 refer to the Windows user s guide for information about your version of Windows 1 Close all programs in use then insert the supplied diskette into your computer s floppy disk drive 2 From the Start Menu select Run type a scope setup then press Enter 3 Follow the instructions that appear To run the program double click the SCOPEVIEW icon Follow the on screen help for specific operating instructions 28 TECHNICAL INFORMATION You need the following information if you are writing your own interface software Communication Parameters Transmission rate 600 baud Character coding 7 bit ASCII Parity None Stop Bits 2 Data Format The data format consists of a frame of 14 bytes The frames are set as follow
9. arged before you make a resistance measurement Follow these steps to measure resistance 1 Remove all power from the circuit under test and discharge all capacitors 2 Set the selector to Qee Caution Never connect the test leads to a source of voltage while the selector is set to Q 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 The resistance value appears 21 Notes With no resistance connected across the test leads meaning resistance is infinite O L appears when you set the meter to measure resistance This is normal If you are measuring resistance of about 1 MQ or more the display might take a few seconds to stabilize This is nor mal As with the voltage range use the measuring units that appear on the display to determine the current resistance range If only Q appears the values of the measurements are in ohms If K and Q appear the meter is measuring kilo hms 1 kilohm 1000 Q If M and Q appear the meter is measuring megohms 1 megohm 1 000 000 Q CHECKING CONTINUITY You can use the meter to check for shorted or open electrical circuits 1 Remove all power from the circuit under test and discharge all capacitors 2 Set the selector to QP Caution Never connect the test leads to a source of voltage while the selector is set to Qef 3
10. essaeeeaeessaeeeaaeseaeeeaeeseeeeeeeeaas 9 Resistance erene ao a a cron untied ct ee aa a ea aaae ia a aes ven cnn dearth Atee ee EEEE 10 Continuity Testi ree EA A AA de E E ne 10 Diode TeSt iiia a e ae a e a aa a a ane Decree a a a 10 Communication a E EE ane ic ei E eee 10 Miscellaneous oia dada bl tai 11 E O 12 installing a Battery o a AR 12 Connecting the TestLE ads a seed 14 Using the Stand viii tanta te ts tad 14 Using the Meter noon oocnccconincnonaccnnncncnnnn cnn 15 Measuring High Voltage Circuits Guion ita 16 Overrange NICATION iii rai aa lidad 16 Using Display Hold WEE E a E td et dades 17 Using Range Hold iii E ARE Bets 17 Making Measurements mmmmnicccnnininnicnncrarnr nnana nanna 18 Measuring DG AG Voltage italia Me nl dial 18 Measuring Three Phase AC Voltage ceeseesceceseeescesseeeeeneseaeeesaeeeaeeeaeeseaeeeseecaaessacesaeeseeseaeeesaesaeseaeeseeseaeeseeeenaeees 19 Measuring CUTE ENEE EE dara 19 Measuring ResIiStanCO acia oia todabia 21 Checking Gomtitiuity 27 22 aci AA rosa III aia E E aaa De 22 GheckingDiodes icon tia bar a dad 23 Checking Diode Polarity viii aaa a da 25 Using the Meter With a Computer ooomnccccnnonnnonnncr cen 26 Connecting the Meter to a COMputer arera a aa a raa aaa aE a a aeara A a a aa a aa a aan aAA aas aE EEEE aaia 26 Usingithe Supplied Software cool idad 26 Wo the DOS Softwares AA SET T OT E E T 27 Using the Windows Softwares licor aaa le tdi 28 Technical I
11. from state to state RadioShack Customer Relations 200 Taylor Street 6th Floor Fort Worth TX 76102 We Service What We Sell RadioShack A Division of Tandy Corporation Fort Worth Texas 76102 09A99 Printed in Korea
12. high input sensitivity produces a wandering effect When you connect the test leads to a circuit a real measurement appears 15 MEASURING HIGH VOLTAGE CIRCUITS When you use the meter to check a high voltage circuit do not try to position both test leads at once Instead use an insu lated slip on alligator clip available at your local RadioShack store to clamp one of the test leads to the neutral or ground lead of the circuit usually a bare green or white lead in AC wiring circuits Then probe for voltages using the other test lead This helps prevent accidentally touching a hot wire because you need to concentrate on only one test lead OVERRANGE INDICATION The following appears when the voltage or amperage you are measuring exceeds the meter s range no l mV 20 30 40 DOT MAMMA AA If this happens disconnect the meter from the circuit you are measuring or change the meter s measuring range 16 USING DISPLAY HOLD Your meter s display hold feature lets you hold the current reading on the meter s display Press D H to hold all indications on the display D H display hold appears and the meter holds the measured value on the display even if you remove the test leads from the circuit To cancel hold press D H again D H disappears USING RANGE HOLD Your meter is preset to automatically set a constant measurement range for voltage or resistance you measure The range hold feature lets you hold the
13. ions 1 this device may not cause harmful interference and 2 this device must accept any interference received including any interference that may cause undesired operation 35 Limited Ninety Day Warranty This product is warranted by RadioShack against manufacturing defects in material and workmanship under normal use for ninety 90 days from the date of purchase from RadioShack company owned stores and authorized RadioShack franchisees and dealers EXCEPT AS PROVIDED HEREIN RadioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED WAR RANTIES INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 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 EN TITY WITH RESPECT TO ANY LIABILITY LOSS OR DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE OR PERFOR MANCE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS WARRANTY INCLUDING BUT NOT LIMITED TO ANY DAMAGES RESULTING 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 the limitations on how long an implied warranty lasts or the exclusion of incidental or consequential damages so the above limitations or exclusions may not apply to you In the even
14. it gently pull it up If the fuse is blown discard it Then remove the spare fuse from beside the battery compartment and insert it into the fuse holder F1 F2 Maire 000 000no000 33 5 The 15A 250V fast acting fuse F2 is underneath the circuit board next to the battery compartment To remove it gently lift up the circuit board until you can see the fuse then gently pull it up F2 CO 000 6 If the fuse is blown discard it You can get a new fuse at your local RadioShack store Then insert the new fuse into the fuse holder 7 Replace the back cover and secure it with the screw Warning Do not operate your meter until the back cover is in place and secured 34 THE FCC WANTS YOU TO KNOW This equipment complies with the limits for a Class B digital device as specified in Part 15 of FCC Rules These limits pro vide reasonable protection against radio and TV interference in a residential area However your equipment might cause TV or radio interference even when it is operating properly To eliminate interference you can try one or more of the fol lowing corrective measures e reorient or relocate the receiving antenna e increase the distance between the equipment and the radio or TV Consult your local RadioShack store if the problem still exists You must use shielded interface cables with this equipment This device complies with Part 15 of FCC Rules Operation is subject to the following two condit
15. n and might invalidate it s warranty If your meter is not performing as it should take it to your local RadioShack dealer for assistance CLEANING To keep the meter looking new occasionally wipe it with a cloth slightly dampened with water Do not use harsh chemi cals cleaning solvents or strong detergents to clean the meter Warnings Do not let any water drip inside the meter while cleaning it Make sure that the meter is completely dry before using it REPLACING THE FUSES If the meter does not work you might need to replace one of the fuses with the spare fuse one 2A 250V fast acting fuse we have included with your meter Your meter has two fuses Fuse F1 is a 2A 250V ceramic fuse and fuse F2 is a 15A 250V fast acting fuse spare not supplied Caution Do not use fuses with ratings other than those specified here Doing so might damage your meter 32 Follow these steps to replace the fuses Ais Turn the meter off if it is not already off then disconnect the test leads if they are connected Warning To avoid electric shock you must disconnect the test leads before you remove the back cover Lift the stand on the back of the meter and use a Phillips screwdriver to loosen the screws from the back cover slide off the RS 232C port cover on top of the meter then lift off the cover i The 2A 250V ceramic fuse F1 is on top of the circuit board next to the battery compartment To remove
16. nformation ia ias 29 Communication Parameters esis A ic ati ico tri dete tence 29 Data Format eah 8 ciehiean EA BR ee eee eee 29 Hints for Writing Your OWn SoftWare reissen ie es e e e e ta o aea ai a aa aas at 30 Care and Maintenance a E a E A aE aae a a OaE E EEEE AEN E NE 31 A A A ONE 32 Replacing the F SOS viii AAA ELE ide 32 The FEGG Wants YOU O KNOW cialis p ae a e oaa a 35 A WORD ABOUT SAFETY We have taken every precaution in designing this meter 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 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 30V AC or 60V DC 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 source of voltage when you select the diode check resistance measurement conti nuity measurement or current measurement functions 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 bat tery or fuse Never operate the meter unless ts back cover is in place and fully closed This equipme
17. nt is rated for installation category II maximum 3600 VA 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 This meter is fully calibrated and tested Under normal use no further adjustment should be necessary except as noted in this Owner s Manual If the meter requires repair do not try to adjust it yourself Take it to your local RadioShack store WARNINGS USE EXTREME CAUTION IN THE USE OF THIS DEVICE IMPROPER USE OF THIS DEVICE CAN RESULT IN INJURY OR DEATH FOLLOW ALL SAFEGUARDS SUGGESTED IN THIS 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 NEVER TRY TO PROBE WITH BOTH TEST LEADS AT THE SAME TIME OR HOLD BOTH TEST LEADS IN ONE HAND IF THIS EQUIPMENT IS USED IN A MANNER NOT SPECIFIED BY THE MANUFACTURER THE PROTECTION PROVIDED BY THE EQUIPMENT MAY BE IMPAIRED TO REDUCE THE RISK OF FIRE OR SHOCK HAZARD DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOIS TURE FOR INDOOR USE ONLY SPECIAL PANEL MARKINGS For your safety we have added special markings to the meter s panel to remind you of the measurement limitations 20A The maximum current that you can measure at this terminal is 20 amps 500V To avoid electrical shock or instrument damage d
18. o Polarity Operation protects your meter and gives valid measurements even when you connect the leads in re verse polarity Auto Power Off conserves battery power by sounding a beep then turning off the meter if you do not change any set tings for 15 minutes Low Battery Indicator so you can quickly see when you need to replace the batteries UL Listed your meter has passed the stringent safety tests required by Underwriters Laboratories Note The UL mark does not indicate that this product has been evaluated by Underwriters Laboratories for the accuracy of its readings Continuity Buzzer Function lets you quickly hear if there is continuity in a cable or between two points Diode Check Function lets you safely check semiconductors for open shorted or normal junctions Latest IC and Display Technology ensure reliability accuracy stability and ease of operation Note Your multimeter requires one 9V battery not supplied CONTENTS AM ADC nia 6 Special Panel Markings iii shes evdesbede soacecedsuucusacetodsvscuvdadesedueutausduebsuds essa 8 Species aid 9 DC Volts Max Measurement 1000V cnccccnccnnccnocccnnnnconncnono nono cnnn nro 9 AG Volts Max Measurement 750 Mii naci ii 9 DC Cutrent Max Measurement 20 A csiiccisestesiveie nena duvet sali dates neh do eee AVe aE aE atadas ias 9 AC Current Max Measurement 20 A 0 ccceecceescecseeeeeeeeececeaeeeaceceeeeaeessaeesaeecaaeseaeecaaeseaeeeae
19. o help prevent damage to the meter USING THE STAND The fold out stand on the back of the meter lets you place the meter upright on a flat surface as shown here for easier viewing 14 USING THE METER Before you use your meter for the first time follow these steps to familiarize yourself with its operation Warning Always turn off power to the circuit you are about to measure before you probe the test leads into high voltage points Caution Be sure to select the correct function before you touch the test leads to the circuit or component to be tested 1 Press ON OFF to turn on the meter if it is not already on The meter beeps and e if the selector is set to DA 00 Mas Fea OF y and a numbered bar graph appears and the meter cali brates itself e ifthe selectoris setto Y 20a gt 400mA gt Of ma AC and a numbered bar graph appears and the meter calibrates itself e if the selector is set to Q Or OL and two bar graphs numbered and analog appear 2 Turn the selector to change between the meter s functions and familiarize yourself with the displays 3 Set the selector to Q then repeatedly press R H until fs appears on the lower left corner of the display 4 Touch the test leads together The meter sounds a tone Note The display might show a phantom reading in some DC and AC voltage ranges when the test leads are not connect ed to a circuit This is normal The
20. o not connect the common input terminal COM jack MAX to any source that exceeds 500 volts with respect to earth ground 400mA The maximum current that you can measure at this terminal is 400 milliamps MAX A Caution Risk of electric shock Refer to the complete operating instructions 1000V The maximum voltage that this meter can measure is 1000V DC or 750V AC 750V MAX A Caution Be extra careful when making high voltage measurements DO NOT TOUCH TERMINALS OR PROBE ENDS m The meter is protected by double insulation CAT Il This equipment is rated for installation category II max 3600 VA SPECIFICATIONS DC VOLTS max MEASUREMENT 1000V 400 mV 4 40 400 V 1000 V ooconoooncncconononnncnoconononenennnnnonononononnnnnnnnonnns 0 5 of reading 0 3 of full scale 3 in last digit AC VOLTS max MEASUREMENT 750 V ADO 4A0D0ADO V iii aaee eaa ria pa EES NA T ET A T E DC CURRENT max MEASUREMENT 20 A QO A SEA E E A E E E E EE AC CURRENT max MEASUREMENT 20 A A Gus Sid E aa sit ETETETT 1 2 of reading 1 5 of reading 1 0 of reading 1 5 of reading 2 5 of reading 1 5 of reading 2 0 of reading 0 8 of full scale 1 2 of full scale 0 5 of full scale 1 2 of full scale 2 0 of full scale 1 0 of full scale 1 5 of full scale 5 in last digit 5 in last digit 3 in last digit 3 in last digit
21. s BYTE 123456789ABCDE Example 1 DC 399 9mV CR Example 2 OH 39 99MohmCR 29 HINTS FOR WRITING YOUR OWN SOFTWARE If you write your own program the host computer must give the meter the D command to activate data transmission The following code is an example of a BASIC program that gets a single reading from the meter 10 OPEN COM1 600 N 7 2 RS CS DS CD AS 2 20 A D 30 PRINT 2 A 40 IN INPUT 14 2 50 PRINT IN 60 CLOSE 2 70 END 30 CARE AND MAINTENANCE Your RadioShack 24 Range LCD Digital Multimeter is an example of superior design and craftsmanship The following sug gestions will help you care for your meter so you can enjoy it for years Keep the meter dry If it gets wet wipe it dry immediately Liquids might contain minerals that can corrode the electronic circuits Use and store the meter only in normal temperature environments Temperature extremes can shorten the Y life of electronic devices damage batteries and distort or melt plastic parts Keep the meter away from dust and dirt which can cause premature wear of parts Handle the meter gently and carefully Dropping it can damage circuit boards and cases and can cause the meter to work improperly Use only fresh batteries of the required size and recommended type Batteries can leak chemicals that damage your meter s electronic parts 31 Modifying or tampering with the meter s internal components can cause a malfunctio
22. ssesesssessscsesesssesesesesesesesssesesesesesssesesesesesesesesesessseseseseseseseseseseserenens 11 3 x 38 16 x 73 7 Inches 34 x 81 x 187 mm Weight without batteries coin hae tegeegendeccdieeecteeeshnee aaa 12 35 oz 350 g Included Accessories cocida Test leads Extra 2A 250V Ceramic Fuse RS232C Cable 3 5 inch floppy disk Specifications are typical individual units might vary Specifications are subject to change and improvement without no tice 11 PREPARATION INSTALLING A BATTERY Your meter requires one 9 volt battery not supplied for power For the best performance and longest life we recommend a RadioShack alkaline battery Warnings To avoid electrical shock disconnect both of the meter s test leads from any equipment before you install or remove the meter s battery Do not operate your meter until the battery is properly installed and the back cover is in place and secured Cautions Use only a fresh battery of the required size and recommended type While the back cover is removed do not touch any of the components inside the meter other than as noted in this Owner s Manual Doing so might damage the meter Follow these steps to install the battery 1 Turn off the meter if it is not already off then disconnect the test leads if they are connected 2 Use a Phillips screwdriver to remove the screw in the meter s back cover and lift off the cover Warning Do not discard the supplied insulation caps
23. t of a product defect during the warranty period take the product and the RadioShack sales receipt as proof of pur chase 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 purchase 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 performance of warranty service Repaired or replaced parts and products are warranted for the remainder 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 installation 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 re moval installation set up service adjustment or reinstallation This warranty gives you specific legal rights and you may also have other rights which vary
24. ter USING THE SUPPLIED SOFTWARE We have supplied two programs with your meter to help you log and display data collected with your meter The MS DOS program is called RS in the GRAPHIC subdirectory on the supplied 3 5 inch floppy disk The Windows program is called Scopeview in the SCOPE directory on the supplied floppy disk 26 Using the DOS Software Notes Your computer must have a VGA monitor to use the supplied DOS software The following steps assume that a user has a basic knowledge of MS DOS commands Refer to your computer s MS DOS user s guide for information about MS DOS commands Follow these steps to install the driver from the supplied diskette 1 Close all programs in use then insert the supplied diskette into your computer s floppy disk drive 2 Create a directory on your hard drive for the software For example to make a directory called METER type cd then press Enter Then type md METER and press Enter 3 Make the directory you created the current directory For example if the directory is METER type cd METER at the DOS prompt then press Enter 4 Copy the files from the GRAPHIC subdirectory on the floppy drive to your hard disk For example type copy a graphic c then press Enter 5 To run the program type Rs then press Enter 6 Follow the instructions that appear 27 Notes e If you do not have a hard disk you can still run the program from the supplied floppy diskette Ch
25. ule inside the meter To avoid electrical shock or damage to your meter install the battery properly in the capsule as shown in Step 3 12 3 Place the battery into the insulation capsule then snap it onto the contacts When appears or the meter stops operating properly replace the battery Warning Dispose of old batteries promptly and properly Do not burn or bury them Caution If you do not plan to use the meter for a week or more remove the battery Batteries can leak chemicals that can destroy electronic parts 13 CONNECTING THE TEST LEADS The test leads supplied with your meter are rated for 1200 volts Use only test leads of the same rating with the meter You can order replacement leads from your local Ra dioShack store WARNING ALTHOUGH THE TEST LEADS ARE RATED FOR 1200 VOLTS THE MAXIMUM RATING OF THIS METER IS 1000 VOLTS DC 750 VOLTS RMS AC DO NOT TRY TO MEASURE ANY VOLTAGE GREATER THAN 1000 VOLTS DC 750 VOLTS RMS AC Plug the black test lead s right angled end into the meter s COM common jack then plug the red test lead s right angled end into the V Q jack Caution If the current in the circuit you are measuring is in the 20A DC AC range or you do not know the amount of cur rent in the circuit see Measuring Current on Page 19 plug the red test lead s right angled end into the 20A jack instead of the V Q jack t
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