c. Pinpoint Mode. By pressing and holding down the Mode Select
button, the F3Ci will enter Pinpoint Mode. In this mode, the tone
will be the loudest when the centre of the coil is directly above the
target.
NOTE
When in Pinpoint Mode, the F3Ci operates as a “static” detector which
means an alarm will sound even when the coil is stationary above the
target.
NOTE
Pressing and releasing the yellow Mode Select button will toggle
between Detection and Interrogation modes.
When pinpointing is completed and the Mode Select button is
released, the detector will return to the Detection Mode (default)
indicated by a double beep.
* WARNING *
Detection Mode is always more sensitive than Interrogation or
Pinpoint modes. This means that, on occasion, when a very small
target is detected in Detection Mode, it is possible the target will
not be detected when selecting Interrogation or Pinpoint modes.
In this instance, the detector should remain in Detection Mode to
locate and mark the target position.
In Detection Mode (default), the F3Ci should be swept with a smooth
even motion. If the detector is swept too fast or too slow, small or
deep targets may be missed. The coil should always be kept at the
same height above the ground with care taken to ensure that the coil
is not inadvertently raised at the end of each sweep (see Figure 19).
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