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6) While the transducer is firmly coupled to the probe-disc, press the
PRB-0 key on the keypad. The MMX-6 will display "Prb0" while it
is calculating its zero point.
7) Remove the transducer from the probe-disc.
At this point, the MMX-6 has successfully calculated it's internal error
factor, and will compensate for this value in any subsequent
measurements. When performing a "probe-zero", the MMX-6 will always
use the sound-velocity value of the built-in probe-disc, even if some other
velocity value has been entered for making actual measurements. Though
the MMX-6 will remember the last "probe-zero" performed, it is generally a
good idea to perform a "probe-zero" whenever the gauge is turned on, as
well as any time a different transducer is used. This will ensure that the
instrument is always correctly zeroed.
In order for the MMX-6 to make accurate measurements, it must be set
to the correct sound-velocity for the material being measured. Different
types of material have different inherent sound-velocities. For example, the
velocity of sound through steel is about 0.233 inches-per-microsecond,
versus that of aluminum, which is about 0.248 inches-per-microsecond. 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 one
1.800.544.2843
Calibration
www.calcert.com
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25
0
30
MMX-6 Ultrasonic Thickness Gauge
sales@calcert.com
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