Setting Up The Flaw Detector - Elcometer FD700DL+ Operating Instructions Manual

14.3 +RECT MEASUREMENT SCREEN
The +RECT view is similar to the RF display
but shows only the positive half of the
waveform.
The detection point is indicated on the
waveform.
14.4 -RECT MEASUREMENT SCREEN
The -RECT view is the same as the +RECT
view but shows only the negative half of the
waveform.
14.5 RECTFW MEASUREMENT SCREEN
The RECTFW view shows the entire sine
wave signal in a rectified view. There is no
polarity.

15 SETTING UP THE FLAW DETECTOR

To set up the gauge ready to detect flaws you must first set the correct transducer type and then
calibrate the gauge by adjusting the sound-velocity value to match the value of the material you are
measuring. The zero value must also be set.
15.1 TRANSDUCER - SETTING TYPE OF
The gauge must be set to the correct transducer type (SINGLE element, or DUAL element):
1. Select MENU/PRB/TYPE.
2. Use LEFT and RIGHT to adjust the value of TYPE.
3. Press MEAS to return to the measurement screen.
Note: Once the transducer type has been selected, your gauge will store and recall this transducer
type every time it is switched on. Use the above procedure to change the TYPE value if necessary.
15.2 ABOUT CALIBRATION
Different types of material have different sound-velocities. For example, the velocity of sound
through steel is 5918 m/s (about 0.233 in/µs) and the velocity of sound through aluminium is
6350 m/s (about 0.248 in/µs).
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