11
Chapter V
Operation
A. ON / OFF Function
Press this key to turn the T-Mike E on. The
unit will display a reading of zero. The T-Mike E is now ready for measurement or calibration. In order to
compensate for any change in the ultrasonic transducer, a PROBE ZERO function should be performed at
this point.
B. Probe Zero Function
The PROBE ZERO function compensates the T-Mike E for the fixed delay of the ultrasonic transducer.
This function should be performed at the start of each day (to compensate for transducer wear) or when-
ever the transducer is changed. Apply a drop of couplant to the end of the transducer. Press the ON/OFF
button on the keyboard to turn on the T-Mike E.
Place the transducer in steady contact with the probe disk located on the top of the T-Mike E. DO NOT
use another 0.250 test piece since the velocity of the probe disk is carefully controlled and errors will
result.
The T-Mike E recognizes that the probe is in contact with the probe disk, and automatically performs the
PROBE ZERO function. Upon completion of the function Prb 0 will appear on the display indicating that the
appropriate transducer delay factor has been entered in memory.
ON
OFF
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