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7 CALIBRATING YOUR GAUGE - MTG4
7.1 USING 1 POINT CALIBRATION
This procedure requires an uncoated sample piece of the material
being measured, the exact thickness of which is known (from having
been measured by some other means) or a calibration standard - see
Section 12.2 'Calibration Standards' on page en-13.
1
Plug the transducer into the gauge ensuring that the connector is
fully engaged.
The wearface of the transducer should be clean and free of any debris.
2
Press the On/Off button to switch the gauge on.
3
Press Menu/Calibration/Cal Method and select '1 Point'.
If '1 Point' is already selected - the calibration method currently selected is
indicated by the icon to the right of the display - simply press
Menu/Calibration/Calibrate.
4
The user will be prompted to perform a 'Zero Set' to set the zero
point of the transducer, which is recommended before calibrating
the gauge - see Section 5 'Setting the Zero Point' on page en-6.
5
When prompted, apply couplant to the uncoated sample or
calibration standard.
6
Press the transducer on to the uncoated sample or calibration
standard, making sure it is flat against the surface.
The display will show a thickness value which is constantly updating. The
stability of the reading is indicated on the stability bar to the right of the
display. A valid reading has a stability of 5 or more.
7
Remove the transducer from the uncoated sample or calibration
standard. The last reading is held on screen. If not
representative, repeat Steps 5-6.
Excessive use of couplant can result in a distorted reading when the
transducer is removed from the surface.
8
Press 'Adjust' and using the
the known thickness value, followed by 'Set' to set the value.
Pressing 'Escape' at any time will exit the calibration procedure without
calibrating the gauge.
The derived sound-velocity will be displayed to the right of the display,
below the calibration method icon.
Note: One point calibration must be performed on material with the paint or coating
removed. Failure to remove the paint or coating prior to calibration will result in
inaccurate readings.
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en-8
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