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Radio Shack EC-252 manual

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  • Page 1

    Cat. No. 65-53 8 OWNER’S MANUAL Please read befo re using this equi pment. EC-252 Metric Conversion Calcul at or 65-538.fm P age 1 Monday, December 13, 1999 9:15 AM[...]

  • Page 2

    2 INTRODUCTION Your EC-25 2 Metric Conv ersion Cal culator conveni ently c ombines an i nternal battery and a s olar pan el, s o you c an use the cal - culator anywhere . It als o has a three-key memo ry system so y ou can ad d, subtract , and recall a ca lc ula t ed figu re. In add iti on to performin g standard calcula tions , your cal - culat or[...]

  • Page 3

    3 KEYS AND FUNCT IONS — Converts sta ndard to metri c mea- surem ents. — Converts met ric to sta ndard mea- surem ents. +/– ( °F °C ) — Changes a dis played numbe r from pos itive to negati ve and vic e versa. Also converts Fahrenhei t to Celsiu s and vice ve rsa. 65-538.fm P age 3 Monday, December 13, 1999 9:15 AM[...]

  • Page 4

    4 ÷ ( acre m 2 ) — Performs t he division function . Also converts acre s to square mete rs and vi ce versa . ON/C — Turns on p ower. Also clears t he las t entr y when pres sed on ce and clea rs the w hole calcul atio n whe n pres sed tw i ce. 7 ( in cm ) — Enters 7 . Also conv erts inche s to cent imeters a nd vi ce ver sa. 8 (ft m ) — E[...]

  • Page 5

    5 4 ( in 2 cm 2 ) — Enters 4 . Also convert s square inches to square c entimet ers and vice ve rsa. 5 ( ft 2 m 2 ) — Enters 5 . Also c onverts square fee t to squ are meters a nd vice v er- sa. 6 ( mi le 2 km 2 ) — Enters 6 . Also c onverts squar e miles to squ are kil ometer s and vice versa . – ( fl. ml ) — Performs the subtraction fun[...]

  • Page 6

    6 3 ( ga l l ) — Enters 3 . Also converts US gallons to lite rs and vi ce versa . M+ ( yard m ) — Adds and s tores a c al- culation answer in memory. Also co nverts yard s to mete rs and vi ce ver sa. 0 ( oz g ) — Enters 0 . Also conv erts ounce s to gram s and vi ce ver sa. . ( lb kg ) — En ters the de cimal po int. Also conv erts pounds t[...]

  • Page 7

    7 OPERATION T URNING ON THE EC-252 Pre ss ON/C to turn on the ca lculator. Notes: • The cal culator turn s of f automati cally if you do n ot press any key wit hin abo ut 1 1 minutes. • When y ou tu rn the ca lculator of f, previ- ous ent ries are cl eare d. CORRECTING ENTRY ERRORS If you enter a n incorrec t value, press ON/C once. Th en enter[...]

  • Page 8

    8 To clear the di splay for a ne w calculat ion, press ON /C twice. 0. appears, th en begin the ne w calcula tion. If yo u pres s an inco rrec t opera tor key ( + , – , × × × × , ÷ ), si mply p ress the c orre ct key and con- tinue yo ur calcul ation. CALCULATION ERRORS ERROR appears in the up per lef t corner when: • A calcul ation res ul[...]

  • Page 9

    9 Estimating Cal culat ion Results If you perform a calcu lation that results i n an ov erfl ow err or , you ca n est imate the co r- rect result (to 8 s ignific ant digits ) by follow- ing th ese s teps. 1. Count the number of digits dis played to the l eft of the d ecimal p oint. 2. Remo ve the decimal point. 3. Add as ma ny zeros to th e right o[...]

  • Page 10

    10 USING THE +/– KEY Press +/– to ch ange the dis played va lue from positi ve to negativ e or from negat ive to positive . Note: MINUS - appears fo r a negative value . CALCULATION EXAMP LES Basic Y o u Press Y ou See 256 + 3 78 = 634. 471 – 223 = 248. 15.5 × 2.3 = 35.65 17.2 ÷ 2.5 = 6.88 24 + 24. 65-538.fm P age 10 Monday, December 13 , 1[...]

  • Page 11

    11 Constants For multip lication , the first v alue you enter is the cons tant. For a ddition, subtracti on, and divisio n, the sec ond value you ent er is the constan t. 36 – 60. 75 × MINUS – 15. 8 ÷ MINUS – 120. 9 = MINUS – 13.333333 Y o u Press Y ou See 5 × × × × 7 = 35. 9 = 45. 10 = 50. 100 ÷ 5 = 20. Y ou Press Y ou See 65-538.fm[...]

  • Page 12

    12 Percentage Example: 20% of 720 is 144 . Add-On Example: 3 0% add ed to 540 i s 702. 200 = 40. 300 = 60. Y ou Press Y ou See 720 × 20 % 144 Y ou Pre ss Y ou See 540 + 3 0 % 702. Y o u Pre ss Y ou See 65-538.fm P age 12 Monday, December 13 , 1999 9:15 AM[...]

  • Page 13

    13 Discount Exam ple: 800 di scounted by 20 % is 640. Reciprocal Exam ple: 1 / 8 = 0.125 Exponent Exam ple: 7 6 = 1176 49 Y ou Pres s Y ou S ee 800 – 20 % 640. Yo u P r e s s Yo u S e e 8 ÷ = 0.125 Y ou Press Y ou See 7 × = = = = = 117649 65-538.fm P age 13 Monday, December 13 , 1999 9:15 AM[...]

  • Page 14

    14 MEMORY CALCULATIO NS To st ore a value in mem ory, first press MRC (mem ory recal l/clear) twice t o clear the mem ory, then pre ss ON/C to cl ear all calcula tions . To add a value to memo ry, enter the num - ber or cal culation you wa nt to add, then press M+ . The cal cul ator total s the c urrent calcula tion (i f one is p ending) an d adds [...]

  • Page 15

    15 To recall the valu e from memo ry, press MRC once. The m emory va lue appea rs. To clea r the conte nts in mem ory, p ress MRC twice so MEMORY di sappears . Exam ple: 2392 + 576 ————— – 73 = –64.6 1582 786 – 43 2 Y o u Pr es s Y o u Se e MRC MRC ON/C 0. 786 M+ MEMORY 786. 432 M– MEMORY 432. 2392 + MEMORY 2392. 576 ÷ MEMORY 296[...]

  • Page 16

    16 CONVERSION and let you sel ect the convers ion di- rection — to me tric or from metric . The symbo ls ab ove each key show y ou whi ch convers ion each ke y makes. For examp le, in cm is printed above 7 . To conver t 12 inches into cen timete rs, press 12 7 . 12 inche s = 30.48 ce ntimeters . To convert centim eters into inches, use . 73 = MIN[...]

  • Page 17

    17 Length Exampl e: 5.5 cm = ? in Exampl e: 7 5 / 8 in = ? cm Exampl e: 12.8 m = ? ft Y o u Pres s Y ou See 5.5 in cm (7) 2.1653543 Yo u P r e s s Yo u S e e 5 ÷ 8 + 7 = in cm ( 7) 19.3675 Y ou Press Y ou See 12.8 ft m ( 8) 41.99475 65-538.fm P age 17 Monday, December 13 , 1999 9:15 AM[...]

  • Page 18

    18 Exam ple : 54 yd = ? m Wei ght Example: 630 lb = ? kg Example: 1 lb = ? k g Y ou Press Y ou See 54 yard m ( M+) 49.3776 Y ou Press Y ou See 630 lb kg (.) 285.768 Y ou Press Y ou See 1 lb kg (.) 0.4536 65-538.fm P age 18 Monday, December 13 , 1999 9:15 AM[...]

  • Page 19

    19 Vo l u m e Exampl e: 389 ft 3 = ? m 3 Exampl e: 100 ml = ? (US) fl. oz Exampl e: 245 (US) ga l = ? l Yo u P r e s s Yo u S e e 389 ft 3 m 3 (2) 11.015313 Y o u Pres s Y ou See 100 fl. ml (–) 3.3813484 Yo u P r e s s Yo u S e e 245 g al l ( 3) 927.423 oz 65-538.fm P age 19 Monday, December 13 , 1999 9:15 AM[...]

  • Page 20

    20 T emperature Example: 125°F = ? °C Example: –35°C = ? °F Area Example: 245 ft 2 = ? m 2 Y ou Press Y ou See 125 °F °C ( +/– ) 51.666666 Y ou Press Y ou See 35 +/- °F °C ( +/– ) MINUS - 31. Y ou Press Y ou See 245 ft 2 m 2 ( 5 ) 22.7605 65-538.fm P age 20 Monday, December 13 , 1999 9:15 AM[...]

  • Page 21

    21 Exampl e: 1540 c m 2 = ? ft 2 Yo u P r e s s Yo u S e e 1540 in 2 cm 2 ( 4 ) 238.70047 65-538.fm P age 21 Monday, December 13 , 1999 9:15 AM[...]

  • Page 22

    22 CARE T o enjoy your EC -252 Metric Conversion Calculato r for a l ong time: • Keep t he calc ulator dry . If it gets wet, wipe it dry imme diately . • Use and s tore the calcu lator on ly in normal te mperat ure environm ents. • Handle the calcula tor gently and care- fully . Don’t drop i t. • Keep th e calculat or away from dus t and [...]

  • Page 23

    23 REPLACING THE BATTERY Alth oug h your ca lcula tor us es sol ar p ower most of the tim e, the backup bat tery will even tual ly beco me we ak and need r eplac - ing. If the disp lay spee d slows do wn in a dimly -lit room, rep lace the batte ry with a 389A -type button-c ell batt ery (Rad ioShack Cat. No. 23 -117). Caution: Use only a fresh bat [...]

  • Page 24

    24 2. Caref ully in sert a smal l, flat-blade screwdriver betwe en the lower case halves, then sl ightly twi st the s crew- driver to separat e the l ower front and back ca se hal ves. 3. Use a screwdriver to gen tly pry out the old batter y . Wa r n i n g : Keep th e battery out of reach of ch ildren. Swallowin g a but- ton-ce ll battery can be fa[...]

  • Page 25

    25 • Dispos e of the old b attery pr omptly and prop erly . Do not burn or b ury it. 4. Posi tion the new batte ry so the posi- tive (+ ) side is up, then insert it into the batt ery co mp artm ent . 5. Snap the front a nd back case halves back tog ether , then replace the screws . 65-538.fm P age 25 Monday, December 13 , 1999 9:15 AM[...]

  • Page 26

    26 SPEC IFIC ATIONS Display .... ................. ........... ... 8-Digit LCD Sola r Cell Minimum Illumi nation ................ .. 150 LUX Battery ................... O ne 389A Button -Cell (Cat. No. 23-1 17) Battery Lif e .................... ...... About 1 Y ear Operatio n T empera ture ....... .... 32°–104° F (0°C–40°C) Dimensio ns ...[...]

  • Page 27

    27 Limited O ne-Y ear W arranty Thi s pr oduct is wa rrant ed by Rad ioSha ck ag ainst manu- facturi ng defects in m at er i al and w o rkman shi p unde r n or- mal us e for o ne (1) yea r from t he dat e of purc hase f rom RadioSh ack c ompan y-owned stores and author ized Ra- dioSha ck franchi sees and dealer s. EXCE PT AS PRO - VIDED HEREIN, Rad[...]

  • Page 28

    RadioSha ck A Division of T andy Corporat ion Fort Worth, T e xas 76102 07A99 Printed in China ( Continued ) become the p roper ty of Radio Shac k. New or rec ondit ion ed part s and p roduc ts may be use d in th e per- forman ce of war ra nty s ervi ce. R epa ired o r repl ac ed pa rts and pro du cts are w a rranted for the r em a inder of th e or[...]