White’s Electronics Spectra V3i - Manual (Page 52)

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Offset - <-100> - +100 – Slightly offsets perfect manual ground balance + or – to enhance specific
performance desires.
Soil Type – Select soil type to dictate appropriate ground tracking range and/or limits.
Normal – Typical ground without significant conductive components.
Salt – Conductive (salt) ground types, wet saltwater beaches, heavily fertilized farm fields (silver/i
ron nitrates) when wet, alkali desert regions when wet.
FILTER & SPEED – Choose features that match the detector’s circuitry to the conditions and personal
preferences .
Search – Selections active in the search mode, TRIGGER on grip in center position.
Ground Filter - Electronic filtering optimizes penetration / detection depth. Less filtering increase
detection depth in low ground mineral areas, however, doesn’t penetrate high ground mineraliza-
tion well. Greater degrees of filtering increase detection depth in high ground mineralization, how
ever, doesn’t penetrate low ground mineralization well. Spectra V3 offers eight combinations of
digital filters. Four different filter frequencies each with a significantly different Band and a High
Pass version.
Filter speed HZ – defines the speed of the filter process.
Lower numbers – 5 Hz and 7.5 Hz allow the filter to process more signals at slower search coil
sweep speeds.
Higher Numbers – 10.0 Hz and 12.5 Hz, process signals at a faster rate allowing for faster search
coil sweep speeds.
Filter Types,
Band Pass- Typically superior for mild (low mineral) ground types and rejection of external
electrical noise / interference. Uses a narrow range of filtration.
High Pass – A faster filter with a broader range of acceptance.
Most Programs use a 10 Band Pass Filter allowing normal ground rejection at normal sweep speeds.
Selecting a filter other than 10 Hz Band Pass allows adaptation to personal search coil sweep speeds and
localized ground conditions.
5.0 Hz Band Pass – Better noise rejection, (Very low ground minerals), very slow search
coil sweep speeds.
5.0 Hz High Pass - A little more sensitive in areas free of external electrical interference.
7.5 Hz Band Pass - Better noise rejection, (Low ground mineralization), slow sweep speed.
7.5 Hz High Pass – A little more sensitive in areas free of external electrical interference.
10.0 Hz Band Pass – Better noise rejection, (Medium ground mineralization), medium
sweep speed.
10.0 Hz High Pass – A little more sensitive in areas free of external electrical interference.
1 2.5 Hz Band Pass - Better noise rejection, (High Ground Mineralization), fast sweep
speeds.
12.5 Hz High Pass – A little more sensitive in areas free of external electrical interference.
Recovery Delay - 1 – 200 200 = slowest. Additional and separate (beyond filtration) selection for
the signal response time. Short response time benefits performance in high trash by providing
better target separation. A longer response time allows a larger window to detect deeper targets.
Ideal Recovery Delay is dependent on Ground Filter selection, ground mineralization, trash
density, and your average sweep speed (how quickly you move the search coil).
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