Examples Of Some Common Target Vdi - AKA Signum MFT 7272? Instruction Manual

Селективный металлодетектор «Сигнум MFT» 7272М. Руководство по эксплуатации.
EXAMPLES OF SOME COMMON TARGET
VDI's
VDI data are for units with a 7 kHz, Normal mode, Turbo and Economy off and DHR
off.
Scale Of VDI
From -90 to -86
From -86 to -70
From -70 to- 50
From -70 to -35
From -35 to -10
From -10 to +10
From +10 to +30 Hammered short cross silver cut half (+22), Roman minim (+14), some
From +30 to +50 Hammered short cross silver penny +47, Celtic gold stator +46-+50,
From +50 to +70 AE antonianus + 64, US copper penny, US zinc Penny, UK pound coin
From +70 to +86 Large copper coins (cartwheel penny, King George coppers, Victorian
From +86 to +90 ground response from an unbalanced device, "hot rocks", as well as
As we can see, even in the good VDI sectors we have targets that are trash. That is,
there will always be trash items mixed in with the more desirable targets with very similar
characteristics.
Also, do not forget that the purpose of VDI is only true in the area of consistent
definition of the instrument and in the absence of other metal objects nearby. For example,
a piece of iron underlying a gold ring will cause the normal VDI of +37 to now read 18/22.
And at the limit of sensitivity in the ground, it may suddenly sound like a deep copper coin
with VDI +85. This is not unique to your device, but for all other devices of this type.
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Items
Hot rocks, improperly configured ground.
small nails and other small iron trash.
medium wrought nails, small arrowheads.
large wrought nails, medieval knives, flat arrowheads, horseshoes,
locks, and other fairly large iron articles.
In this sector there is little iron accept those targets that may be
"masked" by iron, small objects of irregular shape of the low
conductivity of non-ferrous alloys (bronze crosses, thin gold
serpentine chain). Pay particular attention to the arrow and narrow
loop-travel times in this sector.
foil, small crosses of bronze, very small lead, fine gold, small .22 shell
casings.
small thin hammered silver coins,
pence (+28),small lead shot.
larger lead shot( i.e. musket balls, Minnie balls) also lead seals,
Aluminum tabs, larger 14K gold rings.
penny,) UK pound coin, US dime, Quarter, Half dollar and dollars, as
well as large Planar or spherical iron objects (helmets, , plows, axes,
etc.)
very large objects from deep highly conductive metal (e.g. aluminum
basin, a large silver tray). "Hot Stone" signals differ in that they sound
stretched, while the signal from the metal target is usually
concentrated in a small point.
US 5 cent nickel,
50 pence (+24), 20