Renkforce RF-CA-240 Manuale utente
Operating Instructions
RF-CA-240 Scientic Calculator
Item No. 2270443
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Table of contents
Page
1. Introduction..........................................................................................................................3
2. Removing and replacing the calculator’s cover...................................................................4
3. Safety precautions...............................................................................................................5
4. Handling precautions...........................................................................................................6
5. Two-line display...................................................................................................................7
6. Before getting started..........................................................................................................7
7. Basic calculations..............................................................................................................10
8. Memory calculations..........................................................................................................14
9. Scienticfunctioncalculations..........................................................................................16
10. Statistical calculations .......................................................................................................19
11. Technical information.........................................................................................................26
11. Power Supply ....................................................................................................................31
12. Disposal.............................................................................................................................32
13. Technical data ...................................................................................................................33
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1. Introduction
Dear Customer,
Thank you for purchasing this product.
This product complies with the statutory national and European requirements.
To maintain this status and to ensure safe operation, you as the user must observe these
operating instructions!
These operating instructions are part of this product. They contain important notes on
commissioning and handling. Also consider this if you pass on the product to any third
party. Therefore, retain these operating instructions for reference!
If there are any technical questions, please contact: www.conrad.com/contact
Up-to-date operating instructions
Download the latest operating instructions via the link
www.conrad.com/downloads or scan the QR code shown. Follow the
instructions on the website.
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2. Removing and replacing the calculator’s cover
• Before starting......
Holding the cover as shown in the illustration, slide the unit out of the cover.
• After you are nished......
Holding the cover as shown in the illustration, slide the unit out of the cover.
• Alwaysslidethekeyboardendoftheunitintothecoverrst.Neverslidethedisplayendof
the unit into the cover.
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3. Safety precautions
Be sure to read the following safety precautions before using this calculator. Keep this manual
handy for later ref. erence.
Caution
This symbol is used to indicate information that can result in personal injury or material
damage if ignored.
Batteries
• After removing the battery from the calculator, put it in a safe place where it will not get into
the hands of small children and accidentally swallowed.
• Keep batteries out of the reach of small children.lf accidentally swallowed, consult with a
physician immediately.
• Neverchargebatteries,trytotakebatteriesapart.orallowbatteriestobecomeshorted.
Neverexposebatteriestodirectheatordisposeofthembyincineration.
• Misuse of batteries can cause them to leak and damage nearby items, and can create the
riskofreandpersonalinjury.
• Always make sure that the battery’s positive and negative ends are facing correctly
when you load it into the calculator.
• Remove the battery if you do not plan to use the calculator for a long time
• Useonlythetypeofbatteryspeciedforthiscalculatorinthismanual.
Disposing of the calculator
• Neverdisposeofthecalculatorbyburningit.Doingsocancausecertaincomponentsto
suddenlyburst,creatingtheriskofreandpersonalinjury.
• The displays and illustrations (such as key markings) shown in this User’s Guide are for
illustrative purposes only,and may differ somewhat from the actual items they represent.
• The contents of this manual are subject to change without notice.
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4. Handling precautions
• Be sure to press the key before using the calculator for the rst time.
• Even if the calculator is operating normally, replace the battery at least once every
two years.
Adeadbatterycanleak,causingdamagetoandmalfunctionofthecalculator.Neverleavea
dead battery in the calculator.
• The battery that comes with this unit discharges slightly during shipment and storage.
Because of this, it may require replacement sooner than the normal expected battery
life.
• Low battery power can cause memory contents to become corrupted or lost
completely. Always keep written records of all important data.
• Avoid use and storage in areas subjected to temperature extremes.
Very low temperatures can cause slow display response, total failure of the display, and
shortening of battery life, Also avoid leaving the calculator in direct sunlight, near a window,
nearaheateroranywhereelseitmightbeexposedtoveryhightemperatures,Heatcancause
discoloration or deformation of the calculators case, and damage to internal circuitry.
• Avoid use and storage in areas subjected to large amounts of humidity and dust.
Takecarenevertoleavethecalculatorwhereitmightbesplashedbywaterorexposedto
large amounts of humidity or dust. Such conditions can damage internal circuitry.
• Never drop the calculator or otherwise subject it to strong impact.
• Never twist or bend the calculator.
Avoidcarryingthecalculatorinthepocketofyourtrousersorothertight-ttingclothingwhere
it might be subjected to twisting or bending.
• Never try to take the calculator apart.
• Never press the keys of the calculator with a ball-point pen or other pointed object.
• Use a soft, dry cloth to clean the exterior of the calculator.
If the calculator becomes very dirty, wipe it off with a cloth moistened in a weak solution of
waterandamildneutralhouseholddetergent,Wringoutallexcessmoisturebeforewipingthe
calculator.Neverusethinner,benzeneorothervolatileagentstocleanthecalculator.Doing
so can remove printed markings, and can damage the case.
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5. Two-line display
The two-line display makes it possible to view both the calculation formula and its
result at the same time.
• The upper line shows the calculation formula.
• The lower line shows the result.
A separator symbol is displayed every three digits when the integer part of the mantissa has
more than three digits.
6. Before getting started
Modes
Beforestarting a calculation, you mustrstenter the correct mode asindicatedin the table
below.
To perform this type
of calculation:
Perform this key
operation: To enter this mode:
Basic arithmetic calculations COMP
Standard deviation SD
Regression calculations REG
• Pressing the key more than once displays additional setup screens. Setup screens are
described in the sections of this manual where they are actually used to change the calculator
setup.
• In this manual, the name of the mode you need to enter in order to perform the calculations
being described is indicated in the main title of each section.
Example: Statistical
calculations
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Note!
• To return the calculation mode and setup to the initial defaults shown below, press
(Mode) .
Calculation mode: COMP
Angel unit: Deg
Exponentialdisplayformat: Norm1
Fraction display format:
Decimal point character: Dot
• Mode indicators appear in the upper part of the display,
• Be sure to check the current calculation mode (SD, REG, COMP) and angle unit setting (Deg,
Rad, Gra) before beginning a calculation.
Input capacity
• The memory area used for calculation input can hold 79 “steps”. One step is taken up each
time you press a number key arithmetic operator key ( ,,,). A or key
operation does not take up a step, so inputting ,forexample,takesuponlyonestep.
• You can input up to 79 steps for a single calculation. Whenever you input the 73rd step of any
calculation, the cursor changes from “_” to “” to let you know memory is running low. lf you
need to input more than 79 steps, you should divide your calculation into two or more parts.
• Pressing the key recalls the last result obtained, which you can use in a subsequent
calculation. See “Answer Memory” for more information about using the key.
Making corrections during input
• Use and to move the cursor to the location you want
• Press to delete the number or function at the current cursor position.
• Press to change to an insert cursor . Inputting something while the insert cursor is
on the display inserts the input the insert cursor position.
• Pressing , or returns to the normal cursor from the insert cursor
Replay function
• Every time you perform a calculation, the Replay Function stores the calculation formula
and its result in replay memory. Pressing the key displays the formula and result of
the calculation you last performed. Pressing again back steps sequentially (new-to-old)
through past calculations.
• Pressing the or key while a replay memory calculation is on the display changes to
the editing screen.
• Pressing the or keyimmediatelyafter younishacalculation displaystheediting
screen for that calculation.
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• Pressing does not clear replay memory, so you can recall the last calculation even after
you press .
• Replaymemorycapacityis128bytesforstorageofbothexpressionsandresults.
• Replay memory is cleared by any of the following actions.
When you press the key
Whenyouinitializemodesandsettingsbypressing (Mode)
When you change from one calculation mode to another When you turn off the calculator.
Error locator
• Pressing or after an error occurs displays the calculation with the cursor positioned at
the location where the error occurred.
Multi-statements
Amulti-statementisanexpressionthatismadeupoftwoofmoresmallerexpressions,which
are joined using a colon (:).
• Example: To add 2 + 3 and then multiply the result by 4
Exponential display formats
This calculator can display up to 10 dig its.Larger values are automatically displayed using
exponentialnotation.lnthe caseof decimalvalues, youcanselect betweentwo formatsthat
determineatwhatpointexponentialnotationisused.
• Tochange theexponential displayformat,press the key a number of times until you
reachtheexponentialdisplayformatsetupscreenshownbelow.
• Press . On the format selection screen that appears, press toselectNorm1or
forNorm2.
• Norm 1
With Norm 1, exponential notation is automatically used for integer values with more than
10 digits and decimal values with more than two decimal places.
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• Norm 2
With Norm 2, exponential notation is automatically used for integer values with more than
10 digits and decimal values with more than nine decimal places.
• AlloftheexamplesinthismanualshowcalculationresultsusingtheNorm1format.
Decimal point and separator symbols
You can use the display setup (Disp) screen to specify the symbols you want for the decimal
point and 3-digit separator.
• To change the decimal point and separator symbol setting, press the key a number of
times until you reach the setup screen shown below.
• Display the selection screen.
• Press the number key ( or ) that corresponds to the setting you want to use.
(Dot): Period decimal point, comma separator
(Comma): Comma decimal point, period separator
Initializing the calculator
• Performthe following key operation when you want toinitialize the calculation mode and
setup, and clear replay memory and variables.
(All)
7. Basic calculations
Arithmetic calculations
Usee the key to enter the COMP Mode when you want to perform basic calculations.
COMP....................................................................................................................
• Negativevaluesinsideofcalculationsmustbeenclosedwithinparentheses.
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