Dakota Ultrasonics VX User Manual

Page 19

VX Ultrasonic Velocity Gauge

Calibration to a known velocity

NOTE: This procedure requires that the operator know the sound-

velocity of the material to be measured. A table of common

materials and their sound-velocities can be found in Appendix C.

1) Place the transducer on the material to be measured and obtain a

stable reading.

2) Press the CAL key to enter calibration mode. The IN /

µs (or M /s)

symbol will begin flashing.

3) Use the UP and DOWN arrow keys to adjust the displayed velocity

up or down, until it matches the known sound-velocity of the

material.

4) Press the CAL key again and the display will show the thickness

value calculated for the material.

4) Press the CAL key once more to exit the calibration mode. The VX

is now ready to perform measurements.

NOTE: During the calibration procedure when IN /

µs, or M /s is

flashing, pressing the PRB-0 key will restore the gauge to the factory

default sound-velocity for steel (.2330 IN /

s or 5920 M /s).