nalanda MD030, User Manual

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Fig.13
Most valuable metal objects will send repeatable signals. If the signal isn’t
repeatable, it’s mostly a false signal. When there is a clear sound instructing the
buried targets, you could read out the approximate target type and depth on the LCD
screen. And you could also move the search coil above the target objects fast, in order
to get a more stable signal.
5. Make use of the sound, to help discriminate
In the process of detection, the user doesn’t always watch the screen. And the
sound identification system will make four frequency tones to help discriminate the
targets.
Low pitch——ferrous metals, such as iron nail, caps and so on.
Median——S-caps,5
￠
nickel coin.
High pitch——copper, aluminum and silver, such as 1
￠
,10
￠
,25
￠
and so on
zinc coin, copper coin and silver coin.
6. PINPOINT
When detecting in the motion mode, as you should persistently move the search
coil, so although you find the region that burying metals, it’s not easy for you to
determine the exact location, it’s difficult to dig. At this time, you should recur to the
PINPOINT mode.
a) Press and hold down the PINPOINT button, the detector will make a low
single-frequency tone, and the sensitivity is in the highest state.
b) Let the search coil approach the ground, when you find the target, move the
search coil slowly in the region. In the position where the single frequency tone
turns louder and the signal strength cursor begins to appear. Continue moving the
search coil slowly until the sound turns louder, and the signal strength cursor is
full scale.
c) Maintain the position of the detector and release the PINPOINT button for
several seconds. Press the PINPOINT button again, the detector is self-balanced,
and make a low single frequency tone, the signal strength cursor is extinguished.