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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.
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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
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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
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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
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transducer is removed from the surface.
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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
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calibrating the gauge.
The derived sound-velocity will be displayed to the right of the display,
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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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