Gardco PG-1 Руководство пользователя - Страница 7

Просмотреть онлайн или скачать pdf Руководство пользователя для Испытательное оборудование Gardco PG-1. Gardco PG-1 17 страниц. The pocket goniometer

2.4 Drop Application

a) Load a non-absorbent specimen or a carrier strip on top of the

specimen stage (Section 2.2). Make sure the specimen is firmly

held under the four clamping fingers.

b) Apply a gentle pressure on top of the applicator knob with your

first finger and rotate the volume wheel slightly counter

clockwise between your thumb and long finger to pump out a

small pendant droplet at the dispensing tip (Figure 2.3). A

reflecting image of the droplet may now appear below the

droplet (Figure 2.4).

c) After a droplet has been pumped out at the dispensing tip, the

drop dispenser can be pushed downwards until the droplet

makes contact with the specimen surface. Upon contact, two

different situations may occur, which can be described as

a "released" droplet, (Figure 2.5)

which is immediately transferred to the specimen upon

contact with the surface;

a "trapped" droplet, (Figure 2.6)

which is in contact with the specimen surface but has not

released from the dispensing tip. In this case, slowly release

the pressure on the dispenser and the droplet should release

from the dispensing tip. If not, try using a smaller droplet

size in a new test position.

Fig. 2.5 Released droplet

A magnified image of the released droplet should now appear on the projection screen. It is

necessary the contact point between the droplet and the substrate is in view. The image is

viewed slightly from above which produces a "reflected image" of the contacting point for a

reading.

Fig. 2.6 Trapped droplet

Fig. 2.3 Drop Application

Fig. 2.4 Reflecting Image