37
7. Calibration
Calibrating the Gauge
The Gauge is supplied tested and calibrated to BS EN 15317:2007.
The Gauge will have been calibrated to measure thickness
through steel (grade S355JO).
Either a 15 mm or 1/2 ” test block is supplied with the kit so the
Gauge can be quickly checked for correct operation. Note, this test
block is not intended to be used for calibration of the Gauge.
The best way to calibrate the Gauge is to
Calibrate using a
Known Thickness (see page 39) using a sample of the
material you intend to measure. This method determines the
velocity of sound for the material sample, which will always
be more accurate that using a ‘general’ velocity value. For
calibration instructions see page
38.
If there is no test sample available the Gauge can be calibrated by
Setting the Velocity of Sound directly (see page 40). A table
on
page 118 at the back of this manual lists common materials and
their velocity of sound value.
A third method is to leave the Gauge set to its factory-preset value
for Steel [5920 m/s or 0.2332 in/us], and then use a Conversion
Factor from the table of velocities on page 118
.
When data logging you can’t change the velocity or
calibration settings.
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