background image

Table of Contents 

 

1:  Introduction 

 

 

 

         page 

 

 

4

 

1.1:  Quick Overview on the Functions of DoubleCheck XL 

 

 

page   4

 

1.2: 

 

XL 

Product 

Series 

          page 

 

 

4

 

2:  Description and Scope of Delivery 

 

 

 

 

 

 

 

page   4

 

3: 

 

Power 

Supply 

            page 

 

 

5

 

4:  Keyboard Layout   

 

         page 

 

 

5

 

4.1:  The 4 Auxiliary Keys 

 

 

 

 

 

 

 

 

 

page   6

 

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

 

 

 

 

 

 

 

page   6

 

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

 

 

 

 

 

 

 

page   7

 

4.4:  Switch the Device on and off  

 

 

 

 

 

 

 

page   7

 

4.5:  Menu Escape Function   

 

 

 

 

 

 

 

 

page   7

 

4.6:  Delete last Digit / delete all   

 

 

 

 

 

 

 

page   7

 

4.7: 

 

Keylock 

            page 

 

 

7

 

4.8: 

 

Volume 

Control           page 

 

 

7

 

4.9: 

 

Time 

and 

Date 

           page 

 

 

8

 

4.10: 

 

Memory 

Function 

          page 

 

 

8

 

4.10.1:  Save Values 

 

         page 

 

 

8

 

4.10.2:  Select Stored Values 

 

 

 

 

 

 

 

 

page   8

 

4.10.3:  Delete Stored Values 

 

 

 

 

 

 

 

 

page   8

 

4.11: 

 

Repeat 

Function 

          page 

 

 

8

 

4.12:  Backlit Display (option)  

 

 

 

 

 

 

 

 

page   8

 

5: 

 

Arithmetic 

Procedures 

          page 

 

 

5.1:  Standard Arithmetic Functions 

 

 

 

 

 

 

 

page   8

 

5.2:  Advanced Arithmetic Functions   

 

 

 

 

 

 

page   9

 

5.2.1:  Percentages 

 

 

        page 

 

 

9

 

5.2.2:  Square a Given Number   

 

 

 

 

 

 

 

page   9

 

5.2.3:  Extract a Square Root 

 

 

 

 

 

 

 

 

page   9

 

5.2.4: 

 

Reciprocal 

Value          page 

 

 

9

 

5.2.5: 

 

To 

the 

Power 

of 

          page 

9

 

5.2.6:  

Π

 

(Pi) 

            page 

9

 

5.2.7: 

 

Change 

Sign           page 

10

 

5.3: 

 

Conversions 

           page 

10

 

5.3.1:  Currency Conversion          page 

10

 

5.3.2: 

 

Custom 

Conversion 

         page 

10

 

5.4: 

 

Commercial 

Calculator 

         page 

10

 

5.4.1: 

 

Compound 

Interest 

         page 

11

 

5.4.2: 

 

Net 

Present 

Value 

         page 

11

 

5.4.3: 

 

Annuity            page 

11

 

5.4.4: 

 

Annuity 

Initial 

Capital 

         page 

12

 

6: 

 

Help 

Mode             page 

12

 

7: 

 

Menu 

              page 

12

 

7.1:  Number Announcement Format   

 

 

 

 

 

 

page 12

 

7.2: 

 

Alarm 

             page 

13

 

7.3: 

 

Time 

             page 

13

 

7.4: 

 

Date 

             page 

13

 

7.5: 

 

Rounding 

            page 

13

 

Summary of Contents for DoubleCheck

Page 1: ...User Manual ___________________________________________________________________________________________ DoubleCheck XL Commercial Calculator for Visually Impaired People...

Page 2: ...8 4 10 3 Delete Stored Values page 8 4 11 Repeat Function page 8 4 12 Backlit Display option page 8 5 Arithmetic Procedures page 8 5 1 Standard Arithmetic Functions page 8 5 2 Advanced Arithmetic Fun...

Page 3: ...ety Instructions page 13 9 Cleaning the Device page 14 10 Technical Data page 14 11 Guarantee and Service page 14 12 Disposal page 15 12 1 Disposal of Electronic Devices page 15 12 2 Battery Disposal...

Page 4: ...nversion of currency and physical units Date and time with alarm clock function Volume control in 6 steps 1 2 XL Product Series XL calculators are available in the following versions Non talking Non t...

Page 5: ...urn over the device with the high position end showing to the right side In the middle of the bottom side you can feel a little notch This is where you can open the battery compartment Please note tha...

Page 6: ...on without backlit display row 2 Increase volume row 3 Decrease volume row 4 Repeat input 4 2 3 x 3 Group from left to right row 1 short time long date short recall memory long save value short on del...

Page 7: ...umber incorrectly you can always delete the last digit or the complete number Press the ON key short and the complete number will be deleted press the On key long and only the last digit will be delet...

Page 8: ...M will disappear from the display 4 11 Repeat Function By pressing the Repeat key Auxiliary key row 4 or by pressing the Menu key short 3 x 3 group row 2 column 2 the entire entry will be repeated ev...

Page 9: ...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 squa...

Page 10: ...als 86 degrees Fahrenheit To re convert this result to degree Celsius press both the equals key and the plus key 4 x 4 group row 4 columns 3 and 4 5 3 1 Currency Conversion The default exchange rate E...

Page 11: ...know you will 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 for a certain duration for e g 5 years After typing i...

Page 12: ...ercentage and ask you to type in the duration Do so once more and confirm with a short press of the Menu key DoubleCheck XL then will announce the initial capital 6 Help Mode Pressing the keys FIN and...

Page 13: ...L offers you the possibility to round a number This can be helpful when using big values e g in the millions as DoubleCheck XL will then automatically round the value and not announce the entire numbe...

Page 14: ...s e g CDs memory cards etc and batteries 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 event sh...

Page 15: ...13 Manufacturer This product must be disposed of separately from household waste at specially designated collection and recycling points Please dispose used batteries only at specially designated col...

Page 16: ...16 DoubleCheck XL 12 2011...

Reviews: