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 8
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
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