Section No.
Reference No.
OPERATION & MAINTENANCE SPECIFICATIONS MANUAL
09
07
Section:
Subject:
EQUIPMENT/TOOLS
ULTRASONIC THICKNESS MEASUREMENT
Procedure Issue Date: February 2007
Revision
2
Approved by:
Page 3 of 10
1.
Lemo quick-disconnect transducer connectors.
2.
Battery charger connector / data port.
3.
Built-in calibration block.
4.
Coupling indicator.
5.
Backlit amber LCD indicates modes, measurements and icons.
6.
Durable, lightweight, extruded aluminum case.
7.
Environmentally sealed keypad.
8.
Power key.
9.
One-step material calibration key.
10. Arrow keys for calibration.
11. Operator selectable metric or English measurement mode.
Figure 2
T-Mike E - Front Panel
1.
ON/OFF Function (item 8 on Figure 2)
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 of calibration. In order to compensate for any change in the ultrasonic transducer, a
PROBE ZERO function should be performed at this point.
2.
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
whenever the transducer is changed. Apply a drop of couplant to the end of the transducer. Press the
ON/OFF button on they 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 into memory.
NOTE:
During the PROBE function, the T-Mike E velocity is temporarily reset to the velocity of the probe
disk (0.2330 in./msec.).
Upon completion of the PROBE function the velocity will return to the last
calibrated value.
This allows the operator to continue measurements on the previously calibrated
material.
