Dakota Ultrasonics PR-82 - Manual (Page 16)

Dakota Ultrasonics
12
Probe Zero
Setting the Zero Point of the PR-8
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 PR-8
2
is "zeroed", this fixed error
value is measured and automatically corrected for in all subsequent
measurements. The PR-8
2
may be "zeroed" by performing the following
procedure:
Performing a Probe-Zero
1) Make sure the PR-8
2
is on.
2) Plug the transducer into the PR-8
2
. Make sure that the connectors
are fully engaged. Check that the wearface of the transducer is
clean and free of any debris.
3) On the top of the PR-8
2
, above the display, is the metal probe-disc.
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 of the probe-disc. 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 PR-8
2
will display "Prb0" while it is
calculating its zero point.
6) Remove the transducer from the probe-disc.