Altana Pencil Hardness Tester Uživatelský manuál stáhnout pdf (Strana 7)

3.5 Place the Pencil Tester Body on end, onto a

rm horizontal surface (arrow pointing

downwards.

3.6 Slowly slide (care should be taken not to chip

the pencil edges) the prepared pencil into the

hole adjacent to the arrow until it rests on the

same rm horizontal surface as the pencil

tester body. Turn the pencil clamping knob

clockwise to lock the pencil in position.

Carefully lift the pencil tester off the surface,

ensure pencil is set rm and is free from

damage to edges. Check the bubble level

to conrm the pencil has been properly

positioned.

always ensure the position of the pencil

is the same, thereby applying the consistent mass

to the coating under test.

Place the pencil tip gently onto the scales and read

the applied mass, value to be 750 (+10/-10) grams.

If the mass is outside of the specication, move the

slide weight forward to increase the mass or back to

decrease the mass.

3.7 Carefully place the prepared pencil tester,

wheels rst onto the surface to be tested,

gently bring the pencil tip into contact with

the coated surface to be tested, ensure no

chipping occurs.

3.8 Immediately after the tip of the pencil rests

on the coated surface, place thumb and

forenger on the pencil tester, centre portion

of each wheel, push the instrument in the

direction of the arrow for a suggested distance

of 7mm.

3.9 Inspect the coating after a specied period of

time with the naked eye check for marking of

the surface.

3.10 If no marking has occurred, repeat the test

(3.1 to 3.8) on a new portion of undisturbed

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Altana Pencil Hardness Tester Uživatelský manuál Strana 7