Nulling a High Signal
The process of nulling a signal is quite simple. If the initial scan appears like the one in Figure 3.18, there
is a very high signal that is masking most items under it. Nulling a signal means to change the value of a
high or low point on the scan to match the background. Occasionally there are times when a scan point
value is far too high or far too low, when this happens then we need to null or remove the signal error.
¾
Move the crosshairs by clicking on the crosshair buttons (Figure 3.19).
¾
Position the crosshairs so that they are one point in any direction where potential reading is located
on screen from the scan point that you wish to change (Figure 3.20).
• Hold down the control key (Ctrl) and push on the letter “C”, this is the copy command.
• Move the crosshairs directly over the spot that you wish to change.
• Hold down the “Ctrl” key and push on the letter “V”, this is the paste command. The image should
immediately change (Figure 3.21) after the signal has been changed. If more points need to be changed,
then repeat the process until all scan points are changed.
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