Elcometer NDT PTG6 Mode D'emploi page 20

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9 TAKING A READING
9.1 BEFORE YOU START
1 Press the On/Off button to switch the gauge on.
2 Connect a transducer to the gauge.
All single element delay line transducers which can be connected directly
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to the base of a PTG gauge - see Section 16.1 'Transducers' on page 28 -
are 'intelligent' transducers and will be identified automatically by the
gauge. If using other Elcometer 'non-intelligent' single element delay line
transducers or other manufacturers' transducers, a transducer adaptor is
required - see Section 16.5 'Transducer Adaptor' on page 31.
3 Select the measurement mode - see Section 4.6 on page 8.
If using Plastic Mode (PLAS), a graphite delay line must be fitted to the
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transducer as standard acrylic delay lines (supplied with each transducer)
are not suitable. Graphite delay lines are available to purchase as
optional accessories - see Section 16.2 'Delay Lines' on page 29.
4 Calibrate the gauge - see Section 7 on page 13.
5 Prepare the test surface - see Appendix 1 on page 34.
9.2 TAKING A READING IN STANDARD MODE
1 Apply a small amount of couplant to the test surface.
2 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.
3 The display will show a value which is constantly updating.
The gauge will take 4, 8 or 16 readings per second as selected
by the user via Menu/Setup/Reading/Reading Rate.
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 o frequency) for the material being measured. r
4 PTG6 - The last reading is held on screen when the transducer
is removed from the surface.
PTG8 - Press 'Save' to store the current reading in the gauge or
batch memory and remove the transducer from the surface.
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