White’s Electronics Spectra V3 - Manual (Page 39)

Complete Owner’s Guide - Spectra 39
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• 2.5 kHz – Normalize – Different operating frequencies react to the same targets with different
VDI numbers. Multi frequency software normalize target VDI scale.
• Individual frequencies offer the choice of a natural VDI scale dictated by that frequency
(Normalize OFF) or Normalize (shifting to the common scale).
• Normalize avoids confusion providing the common VDI scale.
• There are, however, advantages to using the naturally occurring VDI scales. At 2.5 kHz
Normalize OFF significantly expands the VDI resolution at the high end of the scale (+90s)
where 2.5 kHz is most effective (silver/copper range). The compromise is Normalize OFF
at 2.5 kHz compresses VDI resolution at the low to mid range of the scale (nickel/gold range).
Because the VDI calibration range is distorted with Normalize OFF, accept/reject VDI
settings must be reevaluated.
• If only high range targets are of interest, specific identification of unwanted targets within
this high range is desired, and reconfiguring the accept / reject VDI numbers is implemented,
discerning high range targets among high range unwanted targets can be enhanced with
2.5 kHz and Normalize OFF.
• 7.5 kHz - Normalize - 7.5 kHz provides reasonable traditional VDI calibration, little or no distortion to
traditional VDI scale.
• 22.5 kHz – Normalize – Normalize provides a traditional and common VDI scale.
• There are, however, advantages to using the naturally occurring and different VDI scales
for specific frequencies. At 22.5 kHz Normalize OFF expands the VDI resolution or
range at the low to mid end of the scale (+20s) where 22.5 kHz is most effective (nickel/gold
range). The compromise is Normalize OFF at 22.5 kHz compresses VDI resolution at the
high range of the scale (copper/silver range). Because the VDI calibration range is distorted
with Normalize OFF, accept / reject VDI settings must be reevaluated.
• If only low to mid range targets are of interest (jewelry/nickels), specifc identification of
unwanted targets within this mid range is desired (aluminum), and reconfiguring the accept /
reject VDI numbers is implemented, discerning mid range targets among mid range trash
(aluminum) can be enhanced with 22.5 kHz and Normalize OFF.
Ground Tracking
Autotrac “R” - Selects among options controlling the automatic ground rejection and ground mineral change
tracking feature.
• Ground Probe - From the LIVE CONTROLS, when Ground Tracking is highlighted,
pressing ZOOM accesses the standard MENU with a Ground Probe on right side of display.
Menu/Tab to Zero with search coil held in air away from all metals and ground minerals and
press ENTER. At this point the search coil can be lowered to the ground, and measurements
of significant ground data is displayed. Placing a target on or in the ground, and lowering the
search coil, produces target plus ground data.
• The Phase in a normalized VDI number format is displayed.
• The phase angle in degree’s (360 degrees of phase) at each frequency in use, is displayed.
• The signal strength (using a comparable Rx Gain of 8) in % at each frequency currently in
use is displayed.
• By noting and comparing these measurements to other ground and targets, or