Taking A Reading In Scan Mode - Elcometer MTG6 Gebrauchsanleitung

10 TAKING A READING (continued)

10.3 TAKING A READING IN SCAN MODE

Scan mode allows measurements to be taken over a large surface by
sliding the transducer across the area under test. The gauge takes
readings at a rate of 16 Hz (16 readings per second) and at the end of
each scan, the average, lowest and highest readings are displayed
and can be saved in the gauge or batch memory.
1 Enable 'Scan Mode' via Menu/Setup/Reading/Scan Mode.
2 Apply a small amount of couplant to the test surface.
3 Press the transducer into the couplant, making sure it is flat
against the surface.
Moderate pressure on the top of the transducer using the thumb or index
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finger is sufficient; it is only necessary to keep the transducer stationary
and seated flat against the surface of the material.
4 Press 'Start' to begin the scan and slide the transducer over the
test surface.
5 The display will show a value which is constantly updating.
The stability of the reading is indicated on the stability bar to the right of
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the display. A valid reading has a stability of 5 or more. If the stability
indicator has fewer than 5 bars showing or the numbers on the display
seem erratic, make sure there is an adequate film of couplant beneath the
transducer, and that the transducer is seated flat against the material. If
the condition persists, it may be necessary to select a different transducer
(size or frequency) for the material being measured.
6 Press 'Stop' to stop taking readings and complete the scan.
If the scan is interrupted due to lack of couplant beneath the transducer
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for example, the scan is paused until a good signal is received or 'Stop' is
pressed.
7 The scanned lowest, average and highest reading will be
displayed on screen. Press 'Save' to store the scanned readings
into the gauge or batch memory. Press 'Clear' to disregard the
last scan and start again.
8 Remove the transducer from the surface.
Disclaimer: Inherent in ultrasonic thickness measurement is the possibility that the
instrument will use the second echo rather than the first echo from the
back surface of the material being measured while in standard pulsed
echo mode. This may result in a thickness reading which is TWICE what it
should be. The responsibility for proper use of the instrument and
recognition of these types of phenomenon rests solely with the user of the
instrument.
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