Dakota Ultrasonics MMX-6 User Manual

Page 16

Dakota Ultrasonics

Probe Zero

Setting the Zero Point of the MMX-6 is important for the same reason

that setting the zero on a mechanical micrometer is important. If the gauge

is not "zeroed" correctly, all of the measurements the gauge makes will be

in error by some fixed number. When the MMX-6 is "zeroed", this fixed

error value is measured and automatically corrected for in all subsequent

measurements. The MMX-6 may be "zeroed" by performing the following

procedure:

Performing a Probe-Zero

1) Make sure the MMX-6 is on.

2) Plug the transducer into the MMX-6. 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 MMX-6. Apply a

single droplet of ultrasonic couplant to the face of this disc.

4) Make sure that the MMX-6 is in P-E ( pulse-echo mode ) by

pressing the Dual-Multi key to toggle the modes.

Note: The Probe-Zero feature is not used in Echo-Echo Thru-Paint

mode, and has been disabled. If the PRB-0 key is pressed, while

in this mode, “nO” followed by “Prb0” will be displayed.

5) 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.