Specifications

ADT60/AET60 Reference Manual version 1.5 November 2005

Appendix D: Recommended Device Cleaning Procedures

D.1 Introduction

The key elements of image quality are the consistency within the actual image and the background of the

image. Software algorithms are more accurate and generally faster when the image quality is consistent and

the background has not changed dramatically. Dirty residue, oils, or other material on the surface of the

TouchChip may obscure the image, leaving parts of the image unrecognizable, or creating false features

within the image. Regular use of the TouchChip may leave residue or other foreign materials on the surface.

Performance degradation in terms of False Match and False Non-Match are indicative of such problems.

It is recommended that the sensor be visually inspected and periodically cleaned as described in section

D.2. It is also recommended that before each touch, the sensor be cleaned as described in section D.3.

D.2 Periodic Cleaning

Dampen a lint-free cloth or cotton swab with alcohol or acetone. Gently rub the cloth across the sensor

surface in a left and right direction. Move slowly down the sensor to cover the entire surface area. Repeat

this process 4 times. Visually observe that no residual solution remains on the sensor. After performing the

periodic cleaning operation, a surface conditioning is suggested to obtain the maximum performance from

the TouchChip sensor. Dampen a lint-free cloth with fragrance-free moisturizing lotion, and gently rub the

cloth across the sensor. Make sure that all the lotion will be removed as completion of the cleaning process.

Acid-based fluids, and abrasive materials are not recommended for cleaning the TouchChip.

D.3 User Cleaning

Before each authentication, it is recommended that the user simply wipe the sensor with her/his finger, and

then position the finger for the authentication. With this action we assure that residue from previous usage

will be removed hence giving the best surface conditioning.

 Advanced Card Systems Ltd. Page 25 of 25