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The display will show 'Prb0' while it is calculating its zero point.
5. Remove the transducer from the probe zero disk.
Your gauge is now zeroed.
5.2 CALIBRATING
In order for the gauge to make accurate measurements, it must be calibrated to the sound-velocity of the
material being measured.
Different types of material have different sound-velocities. For example, the velocity of sound through steel
is 5918 m/s (about 0.233 in/µs) and the velocity of sound through aluminium is 6350 m/s (about
0.248 in/µs). If the gauge is not set to the correct sound-velocity, all of the measurements the gauge makes
will be erroneous by some fixed percentage.
The CG10 gauge can store one material sound velocity that can be adjusted by connection to a computer
see "Editing the User-defined Sound-velocity Values" on page 10.
To calibrate your CG20 gauge for the material you are measuring, you select the material from a list of
materials stored in the gauge. For each material stored in the list there is a corresponding sound-velocity
value. There are eight factory-set materials which you cannot change, plus two user-definable sound-
velocity values :
8
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