Elcometer NDT PTG6 Guia Del Usuario página 15

7 CALIBRATING YOUR GAUGE (continued)
7.2 USING 2 POINT CALIBRATION
This procedure requires two uncoated sample pieces of different
known thicknesses (from having been measured by some other
means) of the material under test, which are representative of the
range being measured, or two calibration standards - see Section 16.3
'Calibration Standards' on page en-30.
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 '2 Point'.
If '2 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 When prompted, apply couplant to the first uncoated sample or
calibration standard.
5 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.
6 Remove the transducer from the uncoated sample or calibration
standard. The last reading is held on screen. If not
representative, repeat Steps 4-5.
Excessive use of couplant can result in a distorted reading when the
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transducer is removed from the surface.
7 Press 'Adjust' and using the
the known thickness value, followed by 'Set' to set the value.
8 Repeat Steps 4-7 using the second uncoated sample or
calibration standard.
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: Two 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-14