ZKTeco SilkID F21-ID Installation Manual page 12

21
How to Place a Finger on Scanner
ZKTeco s ngerprint readers will give optimal results for ngerprint matching
if the following recommendations and suggestions are followed.
Select a nger to enroll
It is recommended to use an index nger or
a middle nger.
Thumb, ring or little nger are relatively
di cult to place in the correct position
How to place a nger on a sensor
Place a nger such that it completely covers
the sensor area with maximum contact.
Place core of the ngerprint at the center of
the sensor. The core of a ngerprint is a center
where the spiral of ridges is dense. (Usually core
of ngerprint is the opposite side of the lower part
of a nail.)
Place a nger such that the bottom end of a nail is
located at the center of a sensor.
2.4 Inch TFT Time Attendance & Access Control Terminal INSTALLATION GUIDE
DO NOT place the nger in the following positions
Upright
Sideways
Tips for di erent ngerprint conditions
ZKTecos ngerprint products are designed to verify ngerprints with highest
security irrespective of the conditions of the skin of the nger. However, in case
a ngerprint is not read on the sensor, please refer to the followings tips.
 If a nger is stained with sweat or water, scan after wiping moisture o .
 If a nger is covered with dust or impurities, scan after wiping them o .

If a nger is too dry, please blow some warm air from your mouth on the
nger tip.
Tips for ngerprint enrollment
In ngerprint recognition, enrollment process is very important. When enroll-
ing a ngerprint, please try to place the nger correctly with utmost care.
In case of low acceptance ratio, the following actions are recommended.
 Delete the enrolled ngerprint and re-enroll the nger.

Try another nger if a nger is not easy to enroll due to scar or cuts.
In case of an enrolled ngerprint cannot be used due to injury or if the hand is
full, it is recommended to enroll more than two ngers per user.
2.4 Inch TFT Time Attendance & Access Control Terminal INSTALLATION GUIDE
If a nger is placed
as shown on the left,
only a small area of
a nger is captured.
So it is recommended
to place a nger as
shown on page 21.
Skewed
Partial
22