Radio Shack 22-218 manuale d’uso

Cat. No. 22- 218 OWNER’S MANUAL Pl ease read bef o re usi n g thi s eq ui pme nt. 8-Range Multitester 22- 218. fm P age 1 Fri day, Au gust 6 , 19 99 1 1:44 AM[...]

2 FEA TURES Your Radi o Shack 8- Range Mult itest er is a per fect add ition t o your workshop. It is des igned wi th a preci sion met er move- ment to avoi d mecha nical shock damage. Thi s co mpact -size d pocket m e ter a ccurat ely mea sures AC and DC volt ages, DC curr ent, and r esist ance. It also pa sses th e cri tical sa fety t est r equir[...]

3 Cautions : • Read this manua l compl etel y bef ore you use the met er . • If yo u are not famil iar wit h meters and testing p roce- dures, we suggest th at you read a book about the sub- ject, such as “ Using Y our Me ter” (Radi o Shack Cat . No. 62-2039) . Note : You need one AA battery (not s upplied) to power your multitester. 22- 21[...]

4 A WORD ABOUT SAFETY We ha ve taken ever y prec aution in designi ng thi s meter to en- sure that i t is as safe a s po ssi ble. But safe op erati on depends on you, the ope rator . We recom mend tha t you f ollow thes e sim ple s afe t y rule s : • Never apply volta ges to the met er tha t exceed the l imits give n in the sp ecifi cati ons. Nev[...]

5 • Use e xtr em e c aut ion when you work wit h vol tages ab ove 40V . Always di sconnec t power from t he circuit you ar e measuri ng befor e you connec t test probes t o high- volt - age point s. • Never conn ect the t est pro bes to a sour ce of vol tage when you selec t the Rx1K W or 150mA DC func ti on. • Always dischar ge filter capaci[...]

6 • Never operat e the meter unles s the bat tery cove r is in plac e and f ull y clo sed. • Because m any AC/DC sets h ave a pot enti ally hot c has- sis, be sure the top o f your wor kbench and the floor undern eath it are made of non -conduct ive mater ials. The m ultites ter is f ully c alibrat ed and tes ted. Unde r normal use, no furt her[...]

7 WARNING: USE EXTREME CAUTI ON IN USE OF THIS DE- VICE. IMPROPER USE OF THIS DEVICE CAN RESULT IN INJURY OR DEATH. FOLL OW ALL SAFEGUARDS SUG- GESTED IN THE OWNER’S MANUAL IN ADDIT ION TO NORMAL SAFETY PRECAUTIONS I N DEALING WITH ELECTRICAL CI RCU ITS. DO NOT USE THIS DEVICE IF YOU ARE UNFAMILIAR WITH ELECTRI CAL CIRCUITS AND TESTING PROCEDURES[...]

8 SPE C IF ICA TIO NS Ranges AC V oltage ... . ...... ... .. . .... . ...... . . ... . ..... ...... ... . 15V , 150V , 100 0V DC V oltage ... . ...... . ..... ..... ...... . ..... ..... .. ..... ... 15V , 150V , 1000V DC Current ... ..... .. ..... ..... . . ..... . . .... ..... ...... . ..... ..... ..... .....150 mA Resis tance ..... ...... . .....[...]

9 Se ns it iv it y AC V oltage ..... ... ..... ..... ...... ..... ..... ... ..... ..... ..... ...2000 ohm/ V olt DC V oltage ...... ..... ..... ....... ..... ..... ..... ..... ..... ......2000 ohm/V olt Operati ng T emperat ur e ....... ..... ..... ...... .. 32–109. 4°F (0–43° C) Storage T empera ture .... ..... ..... ....... .... –4–140?[...]

10 SPECIAL P ANEL MARKIN GS We hav e added speci al markings to t he panel t o remind yo u of th e meter ’ s measur ement lim itation s and import ant saf ety preca ut ions . Foll ow the opera ting inst ructions given i n t his owner’ s manual. To avoid el ectr ic shoc k or damage t o the mete r, do not conne ct the g roun d termi nal to a ny s[...]

11 Be extr a carefu l when you ta ke measur ements fo r high voltag e. Do no t touc h the met er’s test probe ends. 22-2 18.fm Pag e 11 Frida y, Au gust 6, 19 99 11:44 AM[...]

12 INST ALLIN G A BA TTER Y Your met er uses on e AA batte ry for power . We r ecommend a n alka line bat te ry, such as Radio Shac k Cat. No. 23- 552/557. WARNINGS: • TO A VOID ELECTRIC SHOCK, DISCONNECT BOTH TEST LEADS FROM ANY EQUIPMENT BEFORE YOU REMOVE THE BA TTERY . • DO NOT OPERA TE THE METER U NTIL YOU REPLACE THE BA TTERY AND CLOSE THE[...]

13 Follo w these steps to ins tal l the bat tery. 1. Set the funct ion sel ector to OFF a nd remove t he tes t leads fr om all test ci rc uits. 2. Use a Phillips screwdri ver to remove the screw on the back of the meter . 3. Remove the b ack of the meter . 22-2 18.fm Pag e 13 Frida y, Au gust 6, 19 99 11:44 AM[...]

14 4. Replace t he weak b at t ery wi th a fresh one, fol l owing the corr ect p olari ty (+ and –). 5. Replace the bac k and secu re it with the screw . Note: If you ca nnot adjust the poin ter to “0” on th e scale whe n you m easure resi stance (see “ Measuri ng Resis tance” ), it is ti me to r eplace the battery. 22-2 18.fm Pag e 14 Fr[...]

15 REPLA CING THE FUSE Your met er is protec ted by a 315 mA fus e. WARNINGS: • TO A VOI D ELECTRI C SHOCK, DI SCONNECT BOTH TEST LEADS FROM ANY EQU IPMENT BEFORE YOU REMOVE THE FUSE. • DO NOT OPERA TE THE M ETER UNTIL YOU REPLACE THE FUSE AND CLOSE THE BACK COVER. 22-2 18.fm Pag e 15 Frida y, Au gust 6, 19 99 11:44 AM[...]

16 CAUTION: FOR CONTINUED PROTECTI ON AGAINST FIRE OR OTHER HAZARD, REPLACE THE FUSE ONLY WITH A 315 mA, 250 V, 5 X 20 MM MINIATURE FUSE (CAT. NO. 27 0- 1046) . Foll ow the s e steps to r epl ace the fuse . 22-2 18.fm Pag e 16 Frida y, Au gust 6, 19 99 11:44 AM[...]

17 1. Set the funct ion sel ector to OFF a nd remove t he tes t leads fr om all test ci rc uits. 2. Use a Phillips screwdri ver to remove the screw on the back of the meter . 3. Remove the b ack of the meter . 4. Replace t he blown fuse wi th a new one. 5. Replace the back and secur e it with t he screw . 22-2 18.fm Pag e 17 Frida y, Au gust 6, 19 [...]

18 OPER A TION Cauti ons: • Use only th e same type of te st lea ds that a r e suppl ied with your meter . These tes t leads are rat ed for 100 0 volt s. Rep lacement s are avail able at your local Radi o Shack st ore. • When the meter is not in use, al ways leave th e funct ion se l ector set t o OFF . 22-2 18.fm Pag e 18 Frida y, Au gust 6, 1[...]

19 Warni ngs: • Do not try to measur e any volt age over the meter’s rat - ing. Us e extreme c are when you u se these hi gh-vol tage ranges. • Never con nect the pr obe you pl ug int o the negat ive (–) termi nal to a sourc e of vo ltage more tha n 500 V . Doing so can creat e a serious shock haz ard. 22-2 18.fm Pag e 19 Frida y, Au gust 6[...]

20 MAKING ACCURA TE MEASUREMENTS For the most acc urate re ading, the te mperatur e shoul d be be- tween 43 °F and 74°F ( 6°C and 23°C) with an 80% maxi mum rela t iv e h u mid it y. Keep th e meter lying f lat on a no n-metal lic surf ace. Al so, us e a range setting t hat results i n a reading i n the upper t hi rd of t he met er sc ale. 22-2[...]

21 For exact readi ngs, l ook at the scal e fr om the poi nt where t he point er and its refl ec t ion in the mir ror come togeth er . 22-2 18.fm Pag e 21 Frida y, Au gust 6, 19 99 11:44 AM[...]

22 Zero Adj ustment If the poi nter d oes no t nor m ally r est exact ly over 0 a t the left side of t he ACV/DC.VMA scal e, adjust th e plas tic screw in th e cente r of the tester face to bring the pointe r to zero. MEASURING VOL T AGE WARNING: I F YOU ATTEMPT TO MEASURE A VOLTAGE GREATER THAN 100 0 VOLTS DC OR AC, YOU MI GHT DAMAGE YOUR METER AN[...]

23 Measuring High V olt ages When you measure vol ta ge in a hi gh-vol tage ci rcuit , do not try to posi tion both pro bes at onc e. Clamp o ne of th e probes t o the ci rcui t’s neut r al or gr ound lead u sing a Radio Sha ck insu- lated s lip-on al liga tor clip (Cat. No. 270-354) . Then pr obe for volta ges with the othe r probe. Thi s helps [...]

24 No te : I n AC wiri ng circ uits, t he ground l ead i s usual ly a bare, green, or wh i t e lead and the hot wi re is usu al l y red , bla ck, or blue. In DC wi ring circuit s, th e ground lead is us ually a bl ack lead; the hot wire is usual ly red. WARNING: NEVER CLAMP ONTO A HOT WIRE. IF YOU CLAMP TO A HOT WIRE AND TOUCH THE OTHER PROBE, YOU [...]

25 Measuring DC V oltage WARNING: IF YO U ATTEMPT TO MEASURE A VOLTAGE ABOVE 1000 VOLTS DC, YO U M IGHT DAMAGE YOUR METER AND EXPOSE YOURSELF TO A SEVERE SHOCK HAZARD. 22-2 18.fm Pag e 25 Frida y, Au gust 6, 19 99 11:44 AM[...]

26 Foll ow the se st eps to meas ur e DC voltag e. 1. Set the functi on select or to one of the DC V p ositi ons . Note: If you are not certai n about the vol tage level, start with the 1000 DC V range. Then tr y the next lowest range until the r eading appears in the uppe r thi rd of th e met er sc ale. 2. Connect t he te st pr obes t o the cir cu[...]

27 Measuring AC V oltage WARNING: IF YO U ATTEMPT TO MEASURE A VOLTAGE GREATER THAN 1000 VOLTS AC, YOU MIGHT DAMAGE THE METER AND EXPO SE YOURSELF TO A SEVERE SHOCK HAZARD. 22-2 18.fm Pag e 27 Frida y, Au gust 6, 19 99 11:44 AM[...]

28 Foll ow the se st eps to meas ur e AC voltag e. 1. Set the functi on select or to one of the AC.V p osi tions . Note: If you are not certai n about the vol tage level, start with the 10 00 AC V r ange. Th en try the ne xt l owest range until the r eading appears in the uppe r thi rd of th e met er sc ale. 2. Connect t he te st pr obes t o the ci[...]

29 Measuring 3-Phase AC V olt age This meter is prim arily desi gned to measur e househol d AC volta ges and i s not in tended f or commerc ial or in dustri al use . If you wa nt to measur e 3-phas e, line- t o- line vol tages, please note the f oll owi ng: • Becau se of the danger s inherent in the mea surement of three- phas e circuits, we stro[...]

30 To det er mine t he line- to-li ne v oltag e, m ultipl y the ra ted l ine-t o- ground voltage by 1.732. F or exampl e, if th e r at ed vol tage is 600 vol ts, the lin e-to- li ne vol tage woul d be: 600 Vol ts x 1.732 = 1039.2 Vol ts In t his exampl e, th e volt age exceeds the meter ’s ra nge and shoul d not be measured. 22-2 18.fm Pag e 30 F[...]

31 Measuring AC V oltage on a DC Source Bias WARNING: NEVER M EASURE MORE T HAN 30 VOLTS AC ON A DC SOURCE BI AS. When an AC voltag e has been superimpo sed on a DC sour ce bias, you can not take ordinar y measur ement s. The readi ngs wander on the sc al e an d are not a ccurat e. However, if you know the appr oximate AC voltage and it does not ex[...]

32 MEASURING DC CURRENT WARNING: NEVER CONNECT THE TEST L EADS TO A SOURCE OF UNKNOWN VOLTAGE WHEN YOU HAVE SET THE FUNCTION SELECTOR TO THE 150 mA DC POSI - TION. 1. Set the functi on select or to 15 0 m A D C . 22-2 18.fm Pag e 32 Frida y, Au gust 6, 19 99 11:44 AM[...]

33 2. Break t he elect rica l path for the ci rcui t in which you want to measur e current. Then c onnect the bl ack t est pr obe to the negat ive si de and th e red tes t probe to t he positi ve side of t he ci rcuit . Read t he res ults on th e scal e. 22-2 18.fm Pag e 33 Frida y, Au gust 6, 19 99 11:44 AM[...]

34 MEASURING RESIST ANCE WARNINGS: • NEVER CONNECT THE TEST LEADS TO A SOURCE OF VOL T AGE WHEN YOU HA VE SET THE FUNCTION SELECTOR TO THE Rx1K W POSITION. • BE SURE THA T THE CIRCUIT UNDER TEST HAS ALL POWER REMOVED AND THA T ANY ASSOCI A TED CAP ACITORS ARE FULL Y DISCHARGED BEFORE YOU MAKE A RESI ST ANCE MEASUREMENT . 22-2 18.fm Pag e 34 Fri[...]

35 1. Disconne ct power f rom the ci rcuit yo u are test ing. Then unplug th e power co r d and remove any bat teri es. 2. Set the f unctio n selector t o Rx1K W . T o uch the pro bes togeth er and adjust the OHMS AD J . co nt rol to b ring th e point er to the “ 0 ” p osition on the s cale. 3. T ouch t he pro bes acr oss t he circuit or c ompo[...]

36 Notes: • When you measure t he resi stanc e of a c omponen t in a cir cuit, disco nnect one side of the componen t you are test ing. This prevent s other co m ponent s in the cir cuit fro m interferi ng wi th the reading . • When you try t o identi fy cathode and anod e ends or the type o f tran sis tor ( P NP or NPN) , the act ual polar ity[...]

37 MAINTENANCE Your Radi o Shac k 8-Range Multit ester is an e xampl e of supe - rior desi gn and cr a ftsmansh ip. The fol lowing s uggestions wil l help you car e for the met er so you can enjo y it for years . • Keep the m eter dr y . If it get s wet, wipe i t d r y immedi ately . Liqui ds m ig ht contai n m in erals that can corro de the elec[...]

38 • Handle the mete r gentl y and carefull y . Droppi ng it can dama ge the circui t boards and can cause it to work impro perly . • Keep the m eter awa y from dus t and dirt , whi ch can cause premature wear of parts. • Wipe the met er with a da m p cloth occasio nally to keep i t look ing new . Do not use har sh chemicals , cle aning sol- [...]

39 Modifyi ng or t ampering with the m eter’s i nterna l component s can cause a malfunct ion and m i ght i nvali date its warranty. I f your m eter is not perfor ming as it shoul d, t ake i t t o your loca l Radio Shack st ore for assi stance. 22-2 18.fm Pag e 39 Frida y, Au gust 6, 19 99 11:44 AM[...]

RADIO SHACK A Div ision of T andy Cor po rati on For t Worth , T exa s 761 0 2 1 1 A5 Pr int ed in Ho ng Ko ng RADIO SHACK L IMITED W A RRANTY This p roduct is warranted a g ainst defects for 90 da y s from date of purchase from Radio Shack c ompan y -owned stores and authorized Radio Shack franchisees and dealers. Within th i s period, we will r e[...]