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Because you have already calibrated the gauge and set up the TRIG function, the gate is
already enabled and a grey cursor is visible in the waveform area of the measurement screen.
4. Use LEFT and RIGHT to position the start of GATE1 to trigger on the waveform.
5. Optional: In the hot menu:
•
Scroll to WIDTH1.
•
Use LEFT and RIGHT to adjust the value of WIDTH1 until the signal is in the gate.
When the signal is in the gate, the height indicator will detect and display the % full screen
height.
6. In the hot menu, scroll to AWS BOX.
7. Use LEFT and RIGHT to position the cursor box over the waveform and then press ENTER to
set the REF GN (reference gain) value.
Note: This process can be repeated and reset multiple times, or until the SET REF GAIN func-
tion is toggled OFF.
8. Press MENU, scroll to the AWS menu and then highlight the SET REF GAIN function.
9. Use LEFT and RIGHT to scroll the value of SET REF GAIN to OFF.
10. Press MEAS to return to the measurement screen.
11. Press OK to view the AWS screen.
21 DAC - DISTANCE AMPLITUDE CORRECTION
21.1 ABOUT DAC
A DAC curve is a gate with a variable threshold to compensate for a given reflector type and size
measured at different depths.
Further
information
www.elcometerndt.com.
Note: Based on the gauge screen resolution, the dynamic range of the DAC is approximately 18 dB.
As a result, inspection of any materials that attenuate more than 18 dB over the inspection range,
the DAC feature should not be used, and TCG should be considered (see "TCG - Time Corrected
Gain" on page 42).
21.2 SETTING UP THE DAC FUNCTION
Before setting up and using the DAC function you must:
1. Conduct a two point calibration - see "Known Thickness Calibration" on page 30.
2. If you are going to use the TRIG mode, set it up before using the DAC function - see "Setting
up Trigonometry Mode" on page 37.
39
can
be
found
on
the
Elcometer
NDT
Knowledge
Centre
on
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