Calibration Methods - Mtg4 - Elcometer MTG2 Guia Del Usuario

6 CALIBRATION METHODS - MTG4

In order for the gauge to make accurate measurements, it must be
set to the correct sound-velocity for the material being measured.
Different types of material have different sound-velocities. For
example, the velocity of sound through steel is 5920m/s
(approximately 0.233in/µs) and the velocity of sound through
aluminium is 6350m/s (approximately 0.248in/µs).
Setting the calibration is crucial for the gauge to function correctly.
The calibration procedure should be performed when the
measurement mode, transducer and / or material type is changed.
The MTG2 is pre-calibrated for steel only - the calibration cannot be
adjusted by the user. The MTG4 has a choice of calibration
methods, see Table 2: Calibration Methods.
To select the calibration method (MTG4), press Menu/Calibration/Cal
Method.
Calibration
Method
1 Point
Material
Factory
Calibration
en-7
R
TABLE 2: CALIBRATION METHODS
Icon Description
This is the simplest and most commonly used
calibration procedure. After setting the zero point -
see Section 5 'Setting the Zero Point' on page
en-6 - a reading is taken and adjusted on an
uncoated sample piece of test material of a known
thickness. Once the thickness has been entered
and confirmed, the derived sound-velocity is
displayed.
Calibration using the sound-velocity of a material,
selected from a pre-defined list of materials stored
in the gauge.
Calibration using the default factory calibration of
the standard sound-velocity for steel, 5920m/s
(approximately 0.233in/µs).
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