Elcometer PG70 Operating Instructions Manual page 15

2. Press the transducer against the sample piece, making sure that the transducer is flat against the
surface of the sample. The display should show some (probably incorrect) thickness value, and nearly
all the bars of the stability indicator should be illuminated.
3. Press CAL. The MM (or IN) symbol should begin flashing. You may remove the transducer at this point
if you wish.
4. Use UP and DOWN to adjust the displayed thickness, until it matches the known thickness of the
sample piece.
5. Press CAL. The M/s (or IN/µs) symbols should begin flashing. The gauge is now displaying the sound-
velocity value it has calculated.
6. Press CAL to exit the calibration mode.
The gauge is now ready to perform measurements.
5.1.2 Known velocity calibration
This procedure requires that the operator knows the sound-velocity of the material to be measured. A table
of common materials and their sound-velocities can be found in page 34.
1. Press ON/OFF to switch on the gauge.
2. Press CAL to enter calibration mode then press CAL again, so that the M/s (or IN/µs) symbols are
flashing.
3. Use UP and DOWN to adjust to the desired value, until it matches the sound-velocity of the material to
be measured.
4. Press CAL to exit the calibration mode.
The gauge is now ready to perform measurements.
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