Instruction Manual for TESA TWIN-SURF
8
3. Rotate the probe holder
at 90°. You can use the
help of a flat screwdriver.
4. Connect the probe in the new position.
5. Perform a new calibration in this configuration
2.7 Measuring surface
roughness
1
Switch on the roughness tester. Set desired functions from the menus, if necessary.
2
Choose the appropriate cut-off value to be used for the measurement according the table
below (ISO 4288).
Ra (µm)
Cut-off (mm)
Lt (mm)
0,02 to 0,1
0,25
0,25
– 1,25
0,1 to 2
0,8
0,8
– 4,0
2 to 10
2,5
2,5
– 12,5
3
Choose the number of cut-off. The number usually selected is 5 cut-offs. For space
reason, if the length is too long, you may change it by reducing the number of cut-off
used for the measurement.
4
Position the probe so that its axis lied as far as possible parallel to the surface the be
inspected. For checking purpose, use the menu
Position
, especially when access to the
point is not easy.
5
Start the measurement cycle by pressing on
. But you may use also the software
TESA DATA-STUDIO to start remotely the measurement, to avoid any influence on the
measuring application.
Whenever possible, mount both the roughness tester and the work piece to
be measured on a rigid testing surface, free from vibrations. Clean the
surface to be checked thoroughly. While holding the unit in the hand, be
sure you don’t move during the measurement operation. If needed, take
several measurements for comparison purposes. If one of them is varying
by far from the others, this means that the unit has been moved during the
exploration. The accessories that came with the unit (probe, probe guard
and raising feet) make positioning easier.
