Elcometer NDT MTG6 Guia Del Usuario página 15

7 CALIBRATION METHODS (continued)
Calibration
Method
c
Material
c
Velocity
Thickness Set
Factory
Calibration
8 CALIBRATING YOUR GAUGE
8.1 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 17.2 'Calibration Standards' on page en-33.
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 6 'Setting the Zero Point' on page en-12.
5 When prompted, apply couplant to the uncoated sample or
calibration standard.
c
'Material' and 'Velocity' calibration methods are useful when uncoated sample test pieces are not
available.
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TABLE 3: CALIBRATION METHODS
Icon Description
Calibration using the sound-velocity of a material,
selected from a pre-defined list of materials
stored in the gauge.
Calibration using the known sound-velocity of the
material under test.
For use in 'Velocity Mode' - see Section 4.6
'Selecting the Measurement Mode' on page en-8
- calibration is performed using the known
thickness of the material under test.
Calibration using the default factory calibration of
the standard sound-velocity for steel, 5920m/s
(approximately 0.233in/µs).
R
en-14