Elcometer NDT PTG6 Mode D'emploi page 21

9 TAKING A READING (continued)
9.3 TAKING A READING IN SCAN MODE - PTG8
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.
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