Measurement - Modes - Elcometer CG70ABDL Operating Instructions Manual

1. Select MENU/TUNE/GAIN and adjust using LEFT and RIGHT or press ENTER to use the
DIGITS EDIT BOX
2. Press OK to set the value
3. Press MEAS to return to the measurement screen.
5.8 THRESHOLD (CG70ABDL only)
The threshold is the level of signal amplitude required to trigger a gate and activate the digital
thickness reading. Increasing the threshold value decreases the sensitivity of the gauge as a more
powerful signal is required to trigger the gate. For example on the A-scan display it may be clear
that there is a flaw in the material but the thickness reading is not taking this into account; lowering
the threshold has the effect of increasing the sensitivity of the gauge to a level that the flaw can be
detected. More information on thresholds can be found on the Elcometer NDT Knowledge Centre
on www.elcometerndt.com
5.8.1 To Adjust the Threshold Value
The threshold value may be adjusted from the hot menu when in the P-E GT or E-E measurement
mode.
5.9 GATES (CG70ABDL only)
Your gauge is equipped with gates which control the time measurement process. Further
information on gates can be found on the Elcometer NDT Knowledge Centre on
www.elcometerndt.com.

6 MEASUREMENT - MODES

To select the measurement mode, press MULTI MODE until the correct mode is displayed or select
MENU/GATE/MEASURE MODE
Note: The availability of the modes depends upon the type of transducer fitted to the gauge.
6.1 PULSE-ECHO MODE (P-E)
The standard measurement mode providing maximum sensitivity. This general purpose mode
should be used for corrosion and flaw inspections and will measure the total thickness of a material.
6.2 PULSE ECHO WITH GATE MODE (P-E GT) (CG70ABDL only)
Pulse to echo measurement with an adjustable gate for problematic applications. see section 9 on
gates.
6.3 ECHO-ECHO MODE (E-E), THRUPAINT™
This special mode allows the user to measure the material thickness of a substrate underneath a
coating while ignoring the coating thickness by using two echoes from the material back wall. This
mode is useful when the coating thickness makes up a sizeable proportion of a material, but has
the impact of reducing sensitivity so should not be used in pit and flaw inspections.
6.4 FLAW MODE (CG70ABDL only)
The Model CG70ABDL includes a Flaw Mode function which provides basic prove-up flaw detection
using an angle beam transducer. This mode enables inspectors to locate porosity, defects,
inclusions and cracks in a variety of test materials. Further information on the Flaw Mode can be
found on the Elcometer NDT Knowledge Centre on www.elcometerndt.com.
For instructions on how to use the Flaw Mode see 'Flaw Mode (CG70ABDL only)" on page 16.
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