Elcometer PTG6, User Manual

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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 16.3 ‘Calibration Standards’ on page 30.
1 Plug the transducer into the gauge ensuring that the connector is
fully engaged.
4
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’.
4
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 When prompted, apply couplant to the 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.
4
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.
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.
4
Excessive use of couplant can result in a distorted reading when the
transducer is removed from the surface.
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7 Press ‘Adjust’ and using the softkeys, adjust the reading to
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the known thickness value, followed by ‘Set’ to set the value.
4
Pressing ‘Escape’ at any time will exit the calibration procedure without
calibrating the gauge.
4
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.
7 CALIBRATING YOUR GAUGE