March 2006 910-257C
MG2 Series Page 3-1
3 STANDARD CALIBRATION
MEASUREMENT
3.1 Introduction
The MG2 calibration procedure adjusts the gage so that it measures
accurately on a particular material, using a particular transducer at a
particular temperature. Calibration procedures include:
1. Transducer Zero Compensation–Calibrates for the sound
transit time in each of the dual transducer delay lines, which
varies from unit to unit and with temperature. This simple
“off-block” procedure must be done when the gage is turned
on, when the transducer is changed, and whenever the
transducer temperature changes significantly.
2. Material Velocity Calibration or CAL VEL–Done using
a thick test block of the measured material with known
thickness or by entering the previously determined material
velocity manually. It must be performed for each new type
of material.
3. Zero Calibration or CAL ZERO–Done using a thin test
block of the measured material with known thickness.
Unlike the first two calibrations, this procedure is not
required unless the best absolute accuracy is demanded
(better than ±0.004” or ±0.10mm). If required, it need only
be done once for each new transducer and material
combination. It does not have to be repeated when the
transducer temperature changes. Transducer Zero
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