White’s Electronics Spectra V3 - Manual (Page 9)

Complete Owner’s Guide - Spectra 9
®
The current target VDI number appears much larger above the rectangle upper left side of display. Listen for a
solid repeatable (over multiple search coil passes) audio “beep” then look for a consistent Icon and/or VDI number
indicating a good quality metal target.
• While sweeping the search coil metal targets will produce blocks above the -95-0-+95 metal range for
each frequency currently in use. Their position in relation to the -95-0-+95 range will indicate the electrical charac-
teristics (target signature) of the metal itself, which is based on the exact metal alloy and size.
In the COIN Program rejected VDI range blocks appear in RED, Accept VDI range blocks appear in Green.
Taller and narrower block patterns indicate higher quality metal alloys. Top block (always the highest frequency) rep-
resents 22.5 kHz, center blocks 7.5 kHz, and bottom blocks (always the lowest frequency) 2.5 kHz. Typically gold
and nickel respond better / stronger at 22.5 kHz, brass better / stronger at 7.5, and silver/copper better / stronger at
2.5 kHz. Noting which line of blocks fades last (lingers longest) is a further indication of the targets likely alloy.
Multiple targets near each other can be tricky. When unusual variations are noticed, sweep the area from
several different directions and/or hold the toggle on the grip and “X” the area to check for multiple targets. Then
sweep each separately and note audio and display.
ICONs - In combination with the VDI number and target signature blocks, an ICON will appear above the
rectangle in the upper right side of display, and a large VDI (visual discrimination indication or reference number)
that represents that range will appear on the upper left side of the display. Some variation is expected from one
search coil sweep to the next. However, overall consistency over several sweeps will produce an accurate indica-
tion of the metal alloy. Multiple targets near each other can be tricky. When unusual variations are noticed, sweep
the area from several different directions, hold the toggle, to check for multiple targets.
• Sweep the search coil close to the ground, scrubbing in grass, an inch above rocky, sandy, or coarse
grounds, from side to side, overlapping each pass by 50%. Avoid arching at the end of each sweep, maintain about
two seconds per pass from left to right and about two seconds returning from right to left. The search coil must
remain in motion for metals to respond.
• Ignore the display and listen for a solid sounding, repeatable audio “BEEP” upon several passes of the
search coil. Ignore inconsistent, or broken sounds. Solid, repeatable “BEEPs”, after multiple passes indicate a
metal target of interest.
• Then look at display. Once a solid and repeatable “BEEP” has been located, sweep over it several times,
and look at the display. A narrow tall bar graph in a desired range plus the large VDI number in the upper left side
of display, and a desired target ICON will indicate a good metal target worth digging.