Specifications

26
F3 COMPACT Operations Manual
4.3 Optional Procedures
If after Step ONE the Threshold Tone is not low and steady, conduct
one or both of the following procedures:
a. Noise Cancel (see 4.3.1)
b. Audio Reset (see 4.3.2)
4.3.1 Noise Cancel
If the Threshold Tone is noisy or uneven when the coil is stationary,
conduct Noise Cancel as follows:
a. Holding the coil stationary and at least 600 mm (24 ins) above
the ground press and immediately release the Noise Cancel
button. (see Figure 17)
Noise Cancel will commence with two single beeps followed by 45
seconds of sharp double beeps, finishing with four single beeps.
Figure 17: Noise Cancel
During the 45 seconds, the detector scans the environment
searching for any electrical interference. Once detected, the F3
COMPACT will automatically select a different operating frequency
to eliminate or reduce the interference.