Checkline TI-25SX, Руководство по эксплуатации, Страница: 14 / 22

–13 –
inches per microsecond. If the gauge is not set to the correct sound velocity, all of the
measurements the gauge makes will be erroneous by some amount.
If the material velocity is known, it can be manually entered into the TI-25SX. If the
exact material velocity is unknown, a common velocity can initially be entered to set the
TI-25SX close to the unknown target velocity, followed by multiple fine adjustments to
the velocity value until the target velocity is discovered.
The steps for entering/editing the velocity value are outlined below:
1. With the transducer free from contact with the material, press the key to
display the current velocity.
2. Use the and keys to scroll the velocity to the known target
value.
NOTE:
The longer the keys are pressed and held, the faster the value will increment/
decrement.
NOTE:
Pressing the key prior to pressing the key will abort the cal
routine without saving any changes.
3. Press the key to set the velocity value and return to the measurement
screen. The new velocity value will be shown at the top of the
display.
CHECK YOUR CALIBRATION!
Place the transducer back on the calibration point
and verify the thickness. If the thickness is not correct, repeat the steps above.
5.3 Basic Material Type
If the material velocity is unknown, a sample thickness cannot be taken directly from
the material, but the general type of material is known, selecting a basic material type
from the common material (MATL) list in the TI-25SX would offer a reasonable
approximation of the thickness. There are 9 common materials and 2 user programmable
settings available. It’s important to note that these velocities will not always be an
exact representation of the material being tested. Use these values only if a close
approximation is acceptable. Follow the steps below to select a basic material type: