Rutus Alter71, User Manual

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Setting Adjustment range
Frequency 4400 – 18400 Hz
Hot Rock -30 – 30
Reaction 1 – 8
Masking 0 – 6
The Engine page contains the following settings:
Frequency
Alter71 has another unique feature, it can be tuned across a very broad spectrum of
frequencies. It is possibly the first entry level metal detector which may be tuned from 4.4 kHz to
18.4 kHz with steps of 0.2 kHz. The user can choose one of 71 available frequencies to work
with. The tuning is done using the
buttons.
The choice of frequency used has a very big impact on the detector’s ability to detect
objects. The general rule is: the smaller the object, the higher frequency used. Frequency also
influences the quality of Discrimination of flat shaped steel objects, the higher the frequency, the
more the properties of the metal sheets resemble those of non-ferrous metals. The frequency
also has an influence on the power consumption of the device. The operating time at 4.4 kHz is
much shorter than at 18.4 kHz. If you are not sure which frequency to work with – use 8 kHz.
4.4 – 6.4 kHz Deep searches for highly conductive objects e.g. large non-
ferrous metal parts, large silver coins or large steel objects
6.6 – 10 kHz Universal search
Above 10 kHz To search for small, thin objects
NOTE: After each frequency change the detector requires the ground balance procedure to be
repeated.
Hot rock
This adjustment allows the detector’s reaction to magnetic rocks and objects of
particularly high identification value to be modified. Magnetic rocks are plain field rocks which
have residual magnetic properties. Magnets do not attract them, but they influence the
detector’s operation. They are essentially recognized by the detector as signals with an ID value
of 0 [-90] and in most cases these objects can be isolated using the Discrimination option, in the
same way as simple steel scrap. Objects with exceptionally high ID values 119 or 120 [+89 or
+90] are large pieces of aluminium, aluminium sheets and aluminium canteens. In this way Hot
rock adjustment can be used to set the reaction to objects at both ends of the identification
scale. This is a result of the detector „virtually” connecting both ends of the scale. The
microprocessor does not treat the identification scale as linear, but rather circular, where values
of 0 and 120 [-90 +90] are connected, and therefore an object identified as above 0 [-90] is
automatically identified as a high value object and vice versa.
RUTUS
Alter71
ver. 2.0 12