Probe Zero - DAKOTA ULTRASONICS DX-2 Operation Manual

Setting the Zero Point of the DX-2 is important for the same reason that
setting the zero on a mechanical micrometer is important. If the tool is not
"zeroed" correctly, all of the measurements the tool makes will be in error
by some fixed number. When the DX-2 is "zeroed", this fixed error value is
measured and automatically corrected for in all subsequent measurements.
The DX-2 may be "zeroed" by performing the following procedure:
1) Make sure the DX-2 is on.
2) Plug the transducer into the DX-2. Make sure that the connectors
are fully engaged. Check that the wearface of the transducer is
clean and free of any debris.
3) The metal probe-disc is on the top end of the DX-2. Apply a single
droplet of ultrasonic couplant to the face of this disc.
4) Press the transducer against the probe-disc, making sure that the
transducer sits flat against the surface. The display should show
some thickness value, and the Stability Indicator should have
nearly all its bars illuminated.
5) While the transducer is firmly coupled to the probe-disc, press the
PRB-0 key on the keypad. The DX-2 will display "Prb0" while it is
calculating its zero point. Upon completion, the tool will display
0.250 inches (6.35 millimeters), assuming the velocity is set at
.2330 in/µsec (mild steel).
6) Remove the transducer from the probe-disc.

Probe Zero

Performing a Probe-Zero
DX-2 Ultrasonic Micrometer
13