White’s Electronics Spectra V3 - Manual (Page 40)

40 Complete Owner’s Guide - Spectra
®
ground/target combinations, an advanced operator can extrapolate information
valuable in choosing options.
• Options and accessory search coils, may change the signal strength,
and have a small effect regarding the phase and the VDI measurement.
Filter & Speed detailed
• Search – Choose options for the standard search mode.
• Ground Filter - Filtering ground minerals allows deeper penetration (detection depth) in
mineralized grounds. Less ground filtering benefits low ground mineral areas may increase
detection depth, however, doesn’t penetrate well in high-mineral ground well. Spectra
offers eight combinations of digital filter configuration. Four filter frequencies each with
a band filter version and a high pass version.
• Filter Speed Hz - Hz defines the speed of the filtering process.
• Lower Numbers - 5Hz and 7.5Hz allow the filter to process the
many signals at slower sweep speeds.
• Higher Numbers -10.0 Hz and 12.5 Hz process the incoming signal
at a faster rate to allow for faster sweep speed.
• Filter Types -
• Band Pass - best for mild ground and filtering out external noise.
Uses a narrow range of filtertration and mild ground reject rates.
• High Pass - A faster ground reject rate with broader range of acceptance.
• Presets -
• Most Spectra programs are preset to a 10 Hz high pass filter configuration.
• This selection allows excellent ground rejection at normal sweep speeds.
• The deep silver program is prest to a 5 Hz band pass configuration.
• This selection favors slower sweep speeds and moderate ground, and yield
extreme depth in these conditions.
• Selecting a filter configuration other than 10Hz high pass allows adaptation to
your sweep speed and ground coditions.
• Recovery Delay - Used to adjust the signal response time.
• A very short response time is useful in high trash areas for better target separation
• A longer response time allows largerwindow to detect deep targets
• A longer response time allows a larger window to detect deeper target before
recovery begins and returns to threshold.
• Ideal Recovery Delay is dependent on Ground Filter selection, ground mineralization,
and your average search coil sweep speed.
• S.A.T. (Self Adjusting Threshold) – Adjust the speed where SAT maintains the threshold hum
during searching. Primarily used as a stabilizing feature for the ALL Metal mode.
• Lower numbers are slower to correct threshold variations, however, allow slower
search coil movement.
• Higher numbers are quicker to correct threshold variations, however, require quicker
search coil movement.
• The ideal setting is one that maintains a steady threshold considering your average
search coil sweep speed and ground conditions yet continues to detect targets
at your slowest search coil sweep.
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