Cygnus 2+ Operating Manual
M5-CYG2P-M-01_Iss6.doc
30
Calibration Options
The Gauge is supplied tested and calibrated. The Gauge will have
been calibrated to measure thickness through steel (grade
S355JO) with a velocity of sound of 5920 m/s.
Either a 15mm 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 to a
Known Thickness 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
than using a ‘general’ velocity value. For calibration
instructions see Calibrating to a known thickness (Single or
1 Point) on page 30 and Two Point Calibration on page 30.
If there is no test sample available the Gauge can be calibrated by
Setting the Velocity of Sound directly. A Table of Sound Velocities
on page 59 lists common materials and their velocity of sound
value. For instructions on Setting the Velocity of Sound see page
36.
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 Sound Velocities on page 59.
Calibrating to a known thickness (Single or 1 Point)
This method of calibrating the gauge is more accurate than using a
standard velocity value as the gauge calculates the velocity of
sound for the sample material.
You can use this calibration method for all measurement modes.
1.
Accurately measure the
thickness of your sample
material.
25.40
mm
