Double Check XL Ba En

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Users Manual___________________________________________________________________________________________

DoubleCheck XL

Commercial Calculator forVisually Impaired People


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Table of Contents

1: Introduction page 41.1: Quick Overview on the Functions of DoubleCheck XL page 41.2: XL Product Series page 4

2: Description and Scope of Delivery page 53: Power Supply page 5

4: Keyboard Layout page 6

4.1: The 4 Auxiliary Keys page 74.2: 3 x 3 Group (from left to right) page 74.3: 4 x 4 Group (from left to right) page 74.4: Switch the Device on and off page 74.5: Menu Escape Function page 74.6: Delete last Digit / delete all page 74.7: Keylock page 84.8: Volume Control page 84.9: Time and Date page 84.10: Memory Function page 8

4.10.1: Save Values page 84.10.2: Select Stored Values page 84.10.3: Delete Stored Values page 8

4.11: Repeat Function page 94.12: Backlit Display (option) page 9

5: Arithmetic Procedures page 95.1: Standard Arithmetic Functions page 95.2: Advanced Arithmetic Functions page 9

5.2.1: Percentages page 95.2.2: Square a Given Number page 105.2.3: Extract a Square Root page 105.2.4: Reciprocal Value page 105.2.5: To the Power of page 105.2.6: (Pi) page 105.2.7: Change Sign page 105.3: Conversions page 105.3.1: Currency Conversion page 115.3.2: Custom Conversion page 11

5.4: Commercial Calculator page 115.4.1: Compound Interest page 115.4.2: Net Present Value page 125.4.3: Annuity page 125.4.4: Annuity Initial Capital page 13

6: Help Mode page 137: Menu page 13

7.1: Number Announcement Format page 137.2: Alarm page 14


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7.3: Time page 147.4: Date page 147.5: Rounding page 147.6: Decimal Places page 14

8: Safety Instructions page 159: Cleaning the Device page 1510: Technical Data page 15

11: Guarantee and Service page 1512: Disposal page 16

12.1: Disposal of Electronic Devices page 1612.2: Battery Disposal page 16

13: Manufacturer page 16


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1: IntroductionDoubleCheck XL is a commercial calculator with extra large buttons and ahuge display with big digits as well. With the backlit display and the speechoutput as optional functions, DoubleCheck XL is particularly suitable forvisually impaired and blind people.

1.1: Quick Overview on the Functions of DoubleCheck XLSpoken functions with natural voice

Extra large display with 10 digits of 2.5 cm (1 in) height

Extra large buttons, size: 1.5 x 1.5 cm (0.6 x 0.6 in)

10 memory spaces

Reciprocal value

Percentages

Square, raise to higher power and extract roots

Calculation of compound interest, cash values and annuitiesConversion of currency and physical units

Date and time with alarm clock function

Volume control in 6 steps

1.2: XL Product SeriesXL calculators are available in the following versions:

Non talking, without backlit display

Talking

With backlit display

Talking and with backlit display

Please note that for versions without speech output andwithout backlit display not all keys functions are available.

Consult instructions before use! Do not operateDoubleCheck XL without reading the instruction manual.Get acquainted with the device and all the accessories.Keep the instruction for reference reading and pass it onwith the device.


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2: Description and Scope of DeliveryIncluded in the delivery are the commercial calculator DoubleCheck XL, a setof batteries (4 x 1.5 V AA) and a printed user manual. A power supply unit andearphones can be ordered optionally.

Place the device on the 4 rubber bumpers in front of you, so that the end with

the high position where you can feel the display is furthest away from you.

Upper side: All the keys can be found on the upper side. They are subdividedinto 3 groups: The first group on the left side consists of 4 round keys. Thesecond group, left from the middle, consists of 3 rows, each including 3bigger, squared keys. The third group, to the right, consists of 4 rows, eachincluding 4 squared keys.

Right side: On the right side of the device, there are three outlets. The one

nearest to you is an earphone socket (earphones are optional and notincluded). Next to the display there are the other outlets, where the socket foran optional power supply (not included) is farthest away from you and theother one is a service outled for our technicians.

Bottom side: On the bottom side of the device, you will find 4 rubberbumpers, the loudspeaker grill and the battery compartment.

3: Power SupplyBatteries: DoubleCheck XL operates with 4 1.5 Volt AA batteries. The batterycompartment is situated on the bottom side of the device. To insert thebatteries, turn over the device with the high position end showing to the rightside. Right from the middle of the bottom side you can feel a little notch. Thisis where you can open the battery compartment. Please note that the lidopens to the right and is not completely removable! Put the 4 batteries in thecompartment with the flat (negative) end of each battery contacting the coil.Close the lid until it locks in place.

Power Supply: DoubleCheck XL can also be operated with a power supply

unit. The power supply unit is not included in the delivery and has to beordered separately! The socket for the power supply unit is located next to thedisplay: its the front outlet on the right side of the device.

Caution: Replace the batteries as soon as the deviceannounces battery weak.


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4: Keyboard LayoutThe keyboard is subdivided into 3 groups: To the left there are 4 round keys,which we call now auxiliary keys. In the middle, next to the auxiliary keys,there is the 3 x 3 group. To the right, the 4 x 4 group is located. The 4 x 4group consists of 4 rows with 4 squared keys, the 3 x 3 group consists of 3rows with 3 squared keys. Each key of the left located 3 x 3 group operates

two functions.

In the following, we describe each row top down and group to group from leftto right.

3 x 3 group of keys

4 auxiliary keys

4 x 4 group of keys


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4.1: The 4 Auxiliary KeysWith respect to the XL product series, there are several settings on the 4auxiliary keys for different product types.

row 1 turn backlit display on/offhelp mode on/off (type without backlit display)

row 2 increase volumerow 3 decrease volumerow 4 repeat input

4.2: 3 x 3 Group (from left to right)

row 1 short = timelong = date

short = recall memorylong = save value

short = switch on / deletelong = delete last digit

row 2 short = recall formula

long = select formula

short = repeat

long = menu

short = recall conversion

long = select conversionrow 3 short = square root

long = Pishort = squaredlong = to the power of

short = percentlong = reciprocal value

4.3: 4 x 4 Group (from left to right)

row 1 digit 7 digit 8 digit 9 divided by

row 2 digit 4 digit 5 digit 6 times

row 3 digit 1 digit 2 digit 3 minus

row 4 digit 0 short = decimal pointlong = change sign

equals plus

4.4: Switch the Device on and offTo switch the device on, quickly press the ON-key (3 x 3 group, top right).

DoubleCheck XL will switch off automatically after a certain time withoutkeystroke (3 minutes). To switch it off manually, press and hold all 3 keys ofthe first row in the 3 x 3 group until you hear a short jingle.

4.5: Menu Escape FunctionTo escape the menu, quickly press the ON-key (3 x 3 group, top right).

4.6: Delete last Digit / delete allIf you typed in a number incorrectly, you can always delete either the last digit

or the whole number. To delete the last digit, press and hold the ON-key (3 x 3group, top right). To delete the whole number, quickly press the ON-key.


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4.7: KeylockTo activate or inactivate the keylock function, keep the 0-key and the plus-keypressed until you hear a short confirmation (4 x 4 group, row 4, left and rightkey).

4.8: Volume Control

With the speech output version, there are 6 volume levels to choose from.The volume level can also be set to 0. To increase the volume press theauxiliary key in row 2. To decrease the volume press the auxiliary key in row3. Another way to change the volume is in the 3 x 3 group: to increase thevolume, shortly press the menu key (3 x 3 group, row 2, middle key) togetherwith the right key of row 2. To decrease the volume press both, the menu keyand the left key of row 2. DoubleCheck XL will announce the volume.

4.9: Time and DateDoubleCheck XL offers a built-in clock. To hear the time, quickly press theTIME/DATE key (3 x 3 group, row 1, left key). To hear the date, press and

hold the TIME/DATE key. Time and date are also available in standby mode ofthe device.

4.10: Memory Function4.10.1: Save Values

In order to save numbers in memory, choose the function save value (pressand hold the button in the middle of the first row in 3 x 3 group) and select amemory cell from number keys 1 to 9. This way the value is stored in theappropriate location (there are up to 9 different memory locations).

4.10.2: Select Stored Values

Use the function recall memory (short press on the middle button of the firstrow in 3 x 3 group) and then press the corresponding number key to selectthe value from a memory location (1 to 9).

4.10.3: Delete Stored Values

In order to delete a stored value, you need to type in 0 and save this value

(see 4.10.1). To write any new value in memory, just save the value to theappropriate memory location.

Caution: The volume level can also be set to 0.DoubleCheck XL then will give no announcements. Thissetting can be reseted by cutting of the power supply (e.g.exchange the batteries).


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4.11: Repeat FunctionBy pressing the auxiliary key in row 4 or by pressing the menu key shortly(middle key in row 2 of the 3 x 3 group) the entire entry can be announced,even before the operation is finished.

4.12: Backlit Display (option)

With the backlit display version you could turn the light on and off by pressingthe auxiliary key in row 1.

5: Arithmetic ProceduresDoubleCheck XL offers all standard arithmetic functions, as well as thepossibility to calculate percentages, extract square roots or square a givennumber.

5.1: Standard Arithmetic FunctionsThe standard arithmetic functions include: to add, to deduct, to multiply and todivide. To conduct one of those standard functions, just type in the numberfollowed by the function (4 x 4 group, the right keys in each of the rows 1 to 4)and the second number. To finish the arithmetic procedure, press the equals-key (4 x 4 group, row 4, column 3). The equals-key is designed in tactile witha short line.

Every key you enter, as well as the result of the calculation are announced ina clear voice. To repeat the result of the calculation, press the equals-keyonce again. If you accidentally type in a wrong number, just press and holdthe ON-key (3 x 3 group, row 1, right key) to delete the last value. This is theway you can delete a whole operation step by step backwards.

5.2: Advanced Arithmetic FunctionsDoubleCheck XL also offers the possibility to calculate percentages, extractsquare roots or square a given number.

5.2.1: Percentages

When calculating percentages the following approaches are most common:

Calculation Example InputPercent How much is 5% of 250? 250 x 5%Percentage 250 is 5% of how much? 250 / 5%Surcharges How much is 250 plus a surcharge of 5%? 250 + 5%Rebate How much is 250 minus a rebate of 5 %? 250 5%


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To calculate for example, how much are 5% of 250, type 250, shortly pressthe multiplication key (4 x 4 group, row 2, right key) followed by the digit 5.Finish the process by shortly pressing the percent-key (3 x 3 group, row 3,right key). DoubleCheck XL will then announce the result.

5.2.2: Square a Given Number

To square a given number, type in the value and shortly press the squared-key (3 x 3 group, row 3 in the middle) followed by the equals key.

5.2.3: Extract a Square Root

To extract a square root, type in the number and shortly press the square rootkey (3 x 3 group, row 3, left key) followed by the equals key.

5.2.4: Reciprocal Value

To calculate the reciprocal value, type in a number and press and hold the

percent-key (3 x 3 group, row 3, right key) followed by the equals key.

5.2.5: To the Power of

Type in a number, press and hold the square-key (3 x 3 group, row 3, middlekey) until you hear to the power of. Now type in the number needed andfinish the calculation by shortly pressing the equals key (4 x 4 group, row 4,column 3).

5.2.6: (Pi)

To calculate with the number Pi, press and hold the square root key (3 x 3group, row 3, left key).

5.2.7: Change Sign

Press and hold the decimal point key (4 x 4 group, row 4, column 2) to changethe sign of a value.

5.3: ConversionsDue to the default conversion settings, the conversion function enables you toquickly calculate e.g. how many miles 10 kilometers are.

Press and hold the conversion key (3 x 3 group, row 2, right key) and youhear the announcement of the conversion which was the last active choice.By shortly pressing the conversion key again, you can now select themeasurement unit you would like to work with. You can choose between thefollowing units: currency (from US Dollar to Euro), temperature (from C toF), volume (from liters to gallon), length (from kilometers to miles), weight

(from kilogram to pound) and customed conversion (for your very ownconversion rate).


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To choose for example temperature, shortly press the menu-key (middle keyin row 2 in 3 x 3 group) and DoubleCheck XL will once again announce theconversion rate. You can now type in the number you like to convert, e.g. 30.To convert this number into degree Fahrenheit, press both the point-key andthe equals-key (4 x 4 group, row 4, columns 2 and 3) and DoubleCheck XLwill announce degrees Celsius equals 86 degrees Fahrenheit. To re-convert

this result to degree Celsius, press both the equals-key and the plus-key (4 x4 group, row 4, columns 3 and 4).

5.3.1: Currency Conversion

The default setting of the DoubleCheck XL provides the conversion from Euroto US Dollar and vice versa, with an exchange rate 1.373. You can easilyadapt the exchange rate. To do so, choose the function currency and pressand hold the menu-key (3 x 3 group, row 2, middle key). Type in the exchangerate you need and confirm by shortly pressing the menu-key again.

DoubleCheck XL will now use this new exchange rate when convertingcurrencies.

5.3.2: Custom Conversion

If the default settings do not offer the conversion you are looking for, you canset your individual conversion rate by choosing the function customconversion. When the function is selected, press and hold the menu-key (3 x3 group, row 2, middle key) and type in the conversion rate you need. Confirmby shortly pressing the middle key. You can now calculate with your individual

conversion rate.

5.4: Commercial CalculatorAs a commercial calculator DoubleCheck XL also offers formulas to calculatecompound interest, net present value or annuities. To activate the formulas,press and hold the formula-key (3 x 3 group, row 2, left key) and select theformula by shortly pressing the right or left key of the same row. Confirm yourselection by pressing and holding the menu key (3 x 3 group, row 2, middle

key).

5.4.1: Compound Interest

This formula helps you to calculate an end capital on the basis of a certaininitial capital and a given duration and percentage.

Example: You have a certain amount of money (initial capital) on yoursavings account. You know, that your bank offers you a certain interest rate(percent) and you decide to keep this amount of money on your account for

e.g. 5 years (duration). After typing in all this information, DoubleCheck XL willannounce how much money you will have on your savings account after those5 years including the interest given by your bank.


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After selecting the formula, DoubleCheck XL asks you to type in the initialcapital. Do so and confirm by shortly pressing the menu key (3 x 3 group, row2, middle key). DoubleCheck XL repeats the value and asks you to type in thepercentage. Do so and confirm by shortly pressing the menu key again.DoubleCheck XL will repeat the percent and ask you to type the duration. Doso and once again confirm by shortly pressing the menu key. DoubleCheck XL

then will announce the end capital.

5.4.2: Net Present Value

This formula helps you to calculate the initial capital on the basis of a certainend capital you wish to have in the near future (including the interest).

Example: You know, you need a certain amount of money in the near future(end capital) and you know that your bank offers you a certain interest rate(percent). You decide to keep money on your savings account for e.g. 5 years

(duration). After typing in all this information, DoubleCheck XL will calculatethe net present value. This is the amount of money, you have to invest inorder to reach said end capital.

After selecting the formula, DoubleCheck XL asks you to type in the endcapital you wish to reach. Do so and confirm by shortly pressing the menu key(3 x 3 group, row 2, middle key). DoubleCheck XL repeats the value and asksyou to type in the percentage. Do so and confirm by shortly pressing themenu-key again. DoubleCheck XL will repeat the percentage and ask you to

type in the duration. Do so and once again confirm by shortly pressing themenu-key. DoubleCheck XL then will announce the net present value.

5.4.3: Annuity

The term annuity is used in finance theory to refer to any terminating streamof regular payments over a specified period of time.

Example: You obtain a credit from your bank (initial capital). You pay acertain percentage of interest for this credit (percent) and you also know thatthe credit is due within the following 20 years, that is 240 months (duration).After typing in all this information, DoubleCheck XL will calculate the monthlyinstallments you have to pay in order to repay the credit.After selecting the formula, DoubleCheck XL asks you to type in the initialcapital. Do so and confirm by shortly pressing the menu-key (3 x 3 group, row2, middle key). DoubleCheck XL repeats the value and asks you to type in thepercentage. Do so and confirm by shortly pressing the menu-key again.DoubleCheck XL will repeat the percent and ask you to type in the duration.

Do so and once again confirm by shortly pressing the menu-key.DoubleCheck XL will then announce the regular payment due.


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5.4.4: Annuity Initial Capital

This formula offers you the vice versa calculation, that means, you can findout which credit amount you could afford.

Example: You know how much money you could afford each month to payinstallments (annuity). You know the conditions of your bank, that is theinterest rate (percent) as well as the time (duration). After typing in all thisinformation, DoubleCheck XL will calculate the credit you could afford to payback with the amount monthly available.After selecting the formula, DoubleCheck XL asks you to type in the annuity.Do so and confirm by shortly pressing the menu-key (3 x 3 group, row 2,middle key). DoubleCheck XL repeats the value and asks you to type in thepercentage. Do so and confirm by shortly pressing the menu key again.DoubleCheck XL will repeat the percentage and ask you to type in theduration. Do so and once again confirm by shortly pressing the menu key.

DoubleCheck XL then will announce the initial capital possible.

6: Help ModePressing the keys FIN and CONV (3 x 3 group, row 2, left and right keys) atthe same time leads you into the help mode. Here you are given a short noteabout the function of the key you are pressing. By pressing FIN and CONVagain you may leave the help mode.

7: MenuHere you can set date, time and an alarm, as well as the numberannouncement format or the decimal places. To enter the menu, press andhold the menu key (3 x 3 group, row 2, middle key) until you hear theannouncement of a menu function. You can now browse through the menu byshortly pressing the right or left key of the same row. To choose one of themenu functions, press and hold the menu key again.

7.1: Number Announcement FormatThis setting enables you to decide whether DoubleCheck XL shouldannounce the result as an entire number (e.g. Threehundredfive) or inindividual units (e.g. Three Zero Five). Press and hold the menu keyto select the menu function. Choose the announcement format entirenumber or individual units and confirm by shortly pressing the menu keyagain.


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7.2: AlarmDoubleCheck XL offers one alarm and up to 10 different jingles. To set thealarm, select the menu function as described above. Realize the necessarysettings (hour, minutes and jingle) by shortly pressing the left or right key ofrow 2 in the 3 x 3 group and confirm each setting by shortly pressing themenu key again.

7.3: TimeTo set the correct time, select the menu function as described above. Realizethe necessary settings (hour and minutes) by shortly pressing the left or rightkey of row 2 in the 3 x 3 group and confirm each setting by shortly pressingthe menu key again.

7.4: DateTo set the correct date, select the menu function as described above. Realize

the necessary settings (year, month, day) by shortly pressing the left or rightkey of row 2 in the 3 x 3 group and confirm each setting by shortly pressingthe menu key again.

7.5: RoundingDoubleCheck XL offers you the possibility to round a number up or down. Thiscould be quite handy, if you are working with high values (e.g. in the millions),as DoubleCheck XL will then automatically round the value and not announcethe entire numbers to the last digit, which could be confusing.

The default setting is always the highest possible (= 10). To change thisvalue, select the menu function as described above and set the preferrednumber by shortly pressing the left or right key of row 2 in the 3 x 3 group.The higher the number, the more detailed the announcement will be. Confirmthe setting by shortly pressing the menu- key again.

7.6: Decimal Places

DoubleCheck XL offers the possibility to set the decimal places. That meansthe user can decide, how many units should be announced after the comma.The default setting is always the highest possible (= 9 units after the comma).To change this value, select the menu function as described above and setthe preferred number by shortly pressing the left or right key of row 2 in the 3x 3 group. The higher the number, the more units will be after the comma.Confirm the setting by shortly pressing the menu key again.


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8: Safety InstructionsDo not expose the device to extreme humidity, heat, cold, dust or dirt.When exposed to splash water, wipe the device off. If water enters the device,remove the batteries and make sure the device is dry.When not using the device for a longer period, remove the batteries, so theycan not damage the device by leaking.

Make sure the batteries are inserted in the correct way.

9: Cleaning the DeviceTo clean the device, use a lightly moistened cloth only!

10: Technical Data

Dimensions: Length: 210 mm (8.3 inches)Width: 170 mm (6.7 inches)

Height: 45 mm (1.8 inches)Weight: 487 g (1.07 pounds) including batteriesPower Supply: 4 x 1.5 V AA batteries

optional: power supply (not included in delivery!)Included in Delivery: DoubleCheck XL

4 x 1.5V AA batteriesprinted users manualoptional: power supply unit

Warranty: 2 years

11: Guarantee and ServiceFrom date of purchase, we issue the following term of guarantee:twenty four (24) months on the device itself, twelve (12) months onaccessories (e.g. power supply units, earphones etc.), six (6) months onwearing parts (e.g. rechargeable batteries, hand cuffs, battery lids etc.), no

guarantee on external data mediums (e.g. CDs, memory cards etc.) andbatteries.

CAUTION: No liquid should enter the device! Avoid strongacid or scrubbing cleansers. Do not scrub the surface with

rough sponges, as they could damage the case of thedevice.


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Under this guarantee, CareTec shall repair a unit that is found to be defective,free of charge, or, at its option, replace it by a reconditioned one. In no eventshall CareTec be liable for indirect, special or consequential damages. Theexposure of the device to liquids, strong electromagnetic fields, moisture, andheat, as well as a dropping of the device, or an opening of the case itself,causes a loss of guarantee. In case of problems please contact CareTec or

your local distributor before returning the device without any apparent reason.We will then inform you about the necessary procedures. The device mayonly be opened by authorized technicians! CareTec reserves the right tomake changes and improvements to its products without further notice.

12: Disposal12.1: Disposal of Electronic Devices

12.2: Battery Disposal

Pb-Cd-Hg These signs can be found on contaminant-laden batteries.Pb = containing lead, Cd = containing cadmium, Hg = containing mercury

13: Manufacturer

DoubleCheck XL 06/2011

This product must be disposed of separately from householdwaste at specially designated collection and recycling points.

Please dispose used batteries only at specially designatedcollection points, never through regular house garbage!

CareTec International GmbHStubenbastei 1, A-1010 Wien, AustriaPhone (+43 1) 513 80 81 0Fax (+43 1) 513 80 81 9E-mail: [email protected]: www.CareTec.at

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