Table of Contents
Advertisement
The gain setting on your gauge can be compared to the volume control of a home stereo system.
If you turn it up too much you cannot hear the music clearly. If it is turned down too much, you cannot
hear it at all.
Note: When the echo-echo through-paint measurement mode is selected, the manual gain feature
is disabled and greyed out in the menu items. In this mode, your gauge switches to an automatic
gain mode (AGC) that optimises the gain setting automatically.
Your gauge has been optimised for a medium gain setting and for the majority of applications it can
be used at this setting. Some applications however may require lower or higher gain settings:
•
Lower values might be necessary for noisy or granular cast materials. If the reading becomes
sporadic and will not settle down or resolve on a thickness value.
•
Higher values may be necessary when trying to measure a material that is hard to penetrate
(due to the material type, or the overall thickness of the material) and when locating fine pits or
flaws. In these instances, increase the gain until the stability indicator reports a good
measurement.
5.8.1 To Adjust the Gain Value
The quickest way to adjust GAIN is directly from the hot menu. Alternatively, adjust the value using
the menus:
1. Select MENU/TUNE/GAIN and adjust using LEFT and DOWN and LEFT and RIGHT or press
ENTER to use the Digits Edit Box
2. Press OK to set the value
3. Adjust to suit the measurement application.
4. Press MEAS to return to the measurement screen.
5.9 THRESHOLD (CG100ABDL gauges 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.
5.9.1 To Adjust the Threshold Value
The quickest way to adjust a threshold value is directly from the hot menu. Alternatively, adjust the
values using the menus:
1. Press MENU/GT1/THRESHOLD1 (THRESHOLD2 and THRESHOLD3 are accessed and
adjusted in the same way from the menus for GT2 and GT3 respectively).
2. Adjust to suit the measurement application.
3. Press MEAS to return to the measurement screen.
5.10 GATES (CG100ABDL gauges only)
Your gauge is equipped with gates which control the time measurement process.
For instructions on how to use gates, see "Gates (CG100ABDL gauges only)" on page 18.
6 MEASUREMENT - MODES
Your gauge has two basic measurement modes, Pulse-Echo and Echo-Echo, plus a number of
variations on these modes for specific measurement tasks.
10
Advertisement
Table of Contents
