Garrett PD 6500i User Manual page 41

PD 6500i User MANUAL
should be investigated. Large differences in the left and right numbers indicate nearby
noise sources. Smaller differences in the left and right numbers indicate more distant
noise sources.
6. Attempt to identify and resolve noise sources by switching off nearby electrical
equipment sequentially while observing changes to the alarm levels. Moving the detector
to change the distance or angle from nearby equipment or interference sources in the floor
or walls is often found to be helpful.
7. The interference may also be resolved by switching M Filter ON or OFF, or adjusting
Frequency. (See Sections 3.5.33–3.5.35.)
6.1.2 MeTHOD TO LOCATe PerIODIC "sPIKING" NOIse sOUrCes
1. Enable the keypad by switching the TOUCHPAD KEY LOCK to the enable position.
2. Switch the IR ANALYSIS to OFF. (See Section 3.5.17.)
3. Observe the Zone indicators to determine the location of the alarm source.
4. Adjust the BASE SENSITIVITY up or down until only a limited number of zone lights are
active. This will indicate the location of the strongest interference. (See Section 3.5.24.)
5. After identifying the location of the strongest interference, investigate possible
mechanical or electrical devices that are in the vicinity. Possible sources of interference
are moving gates, loose panels on cabinet x-ray equipment, electrical components in
nearby equipment. Remember that nearby sources (within a few feet) are likely to cause
the zone lights to activate in only one or two zones, often on only one panel. Sources that
are farther removed are likely to cause more zone lights to activate.
6. One method to further identify the source of noise is to switch off, disconnect or move
equipment suspected of interference. A second method is to temporarily rotate or move
the archway to determine an increase or decrease in interference.
7. The interference may also be resolved by switching M Filter ON or OFF, or adjusting
Frequency. (See Sections 3.5.33–3.5.35.)
8. Remember to restore the Sensitivity and IR settings prior to placing the equipment back
in service.
© 2008 Garrett Metal Detectors 41 PN 1532010 REV F1