press
or press
17.4.1.1. Standard measurement
After positioning of the probe on the surface the display shows continuously
the current reading, according to the normal measuring state.
17.4.1.2. Minimum value measurement
During measurement, the gauge displays the minimum value of the current
measured point. It is suitable for testing a curved surface or to get the
minimum value which is widely used in the thickness measurement of pipeline
tubes.
Notice: It is not recommended to use this function when measuring cast
iron or alloy materials.
17.4.2. Velocity Rate
Sound velocity plays an important role in measurement. Different materials
have different sound velocities. When the sound velocity is incorrect, it will
cause wrong measuring results. There are three ways to set the material's
sound velocity, which are:
1. Directly select preset material velocity,
2. Input the new velocity which is not preset into the menu,
3. Get the accurate sound velocity of the workpiece of which the thickness is
known.
17.4.2.1. Materials
The Velocity selection gives the sound velocity of 9 different materials which
can be selected by users. The 9 materials are: aluminum, titanium, steel,
stainless steel, glass, copper, cast iron, brass and polystyrene. Following sound
velocities are used:
28
to confirm ,
to leave the menu and go to measurment state.
Aluminum
Titanium
Steel
m/s
Inch/µs
6300
0,2480
6100
0,2401
5920
0,2331