attension Theta, User Manual

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2. Brief instructions
This section contains the minimum necessary information about each stage of making measurements
with Theta. It is intended as a reminder for those who already are familiar with basic functioning of the
unit. The rest of this manual has much additional detail on the installation and the operation of the unit
which should be read with care to ensure the accurate collection and analysis of data.
2.1 Installation
Mechanical installation
Place Theta on a vibration free table in an area where local air currents are at a minimum. Connect a
camera (FireWire) and USB cable between the computer and the Theta unit and a power cord from the
mains to the back of the unit. Connect also chosen modules with serial cable to Theta unit.
Software installation
Run the installation DVD and follow the instructions. Remember to check which type of camera is used
(Basler/ 420 fps or ImagingSource/ 60fps) so that the correct driver is installed.
2.2 Calibration
Turn Theta on and open the OneAttension program. Choose measurement method by clicking sessile
drop, pendant drop, meniscus or pulsating drop icon. Click Adjust Camera Parameters and choose
automated camera adjustement by clicking Auto adjust. You are able to adjust the camera settings also
manually if needed.
Place a calibration ball and its magnetic holder on the sample stage. Bring the ball into the image on-
screen and zoom it appropriately by altering the lens zoom adjustment (#15) and the lens focus
adjustment (#14) between the camera and the ball. Press Calibration invalid and accept the calibration
ball diameters (standard 4 mm) to complete the calibration.
2.3 Sessile drop contact angle experiments
Preliminaries
Clean the syringe, place the investigated liquid into it and attach it to the syringe clamp (#11). Prepare
the solid sample and place it on the sample stage. From Theta home tab choose Sessile drop
experiment.
Image Recording
Lift or lower the sample stage (#13) until the solid is visible on the bottom part of the screen. Lower or
raise the syringe (#9) until it is just visible at the top of the screen. Fill in the relevant data on recipe
sheet. It might be necessary to add users, liquids or solids to the database manager found in the Setup
tab.