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thrace terra 2 pulse induction metal detector discriminator
Given the a Thrace Terra 2 is a metal detector digital pulse induction to detect metal objects and treasures buried deep in the ground. The device is constructed simple and easy to work with.When the metal detector review Thrace Terra 2 is almost no maintenance of charging the battery when it is necessary.
Thrace terra 2 is a professional pulse induction (PI) system which incorporates a large search coil (one-meter by one-meter as standard equipment) for the main purpose of finding large objects at great depths. These detection depths can almost be compared with those of magnetometers, which can detect nothing but ferromagnetic objects. Another great advantage of using the thrace terra 2 together with the large search coil is being able to cover a large area in a short period of time. The actual search coil is encased in a square plastic frame (PVC tubing) and can be carried by two persons.
Using the PI-principle offers some decisive advantages.
First, the search coil is not part of a resonant circuit as it is the case with VLF detectors and can, therefore, be of almost any size and shape. This is absolutely necessary in order to increase the location depth considerably. In the second place there is a timely discounting between the transmitting and the receiving phase which makes it possible to work with far greater transmission power.
A further advantage is that small objects like bottle caps, pull tabs, pieces
of aluminum foil, but also single coins are naturally rejected while using the large search coils.
But still the thrace terra 2 is an easy-to-operate metal detector: you only have to deal with four simple controls, of which you need just one while normal operation.
Objects are simultaneously indicated by a meter on the screen and by an audio signal, which increases in frequency while approaching the object. The audio response has a very wide frequency range in order to avoid signal saturation when the search coil approaches a very close object. This makes it easy to pinpoint the exact location.
The function of the thrace terra 2 is divided into two time intervals:
Transmission Phase
A strong duty current is flowing through the search coil about 600 times per second. The linearly increasing current builds up a primary magnetic field which radiates. The current is abruptly cut off after a certain time, so that the primary magnetic field collapses quickly causing so-called eddy currents in the metal object. Strength and duration of these eddy currents depend on the electrical conductivity, size and shape of the object. After a short time delay the search coil is connected to the receiver input.
Receiving phase
The decay of the eddy currents in the object produces a secondary magnetic field, which is radiated by the object. This secondary magnetic field has its effect also on the coil and here induces very low voltages, which are amplified and displayed by a meter and an audio signal. Obviously the detection range has physical limits, because these voltages are extremely weak and can be obscured by external magnetic fields.
thrace terra 2 pulse induction metal detector discriminator
Thrace terra 2 parts for control
To achieve maximum depth of searching, the device must be set according to this manual. Also make sure that you are not around large metal objects – wire mesh, pipes, cables, lines, etc.
DO NOT TEST THE DETECTOR INDOOR!
Assemble the search frame and plug the connecting cable to the appropriate connector on the back panel of metal detector.
You will need at least 40 hours of practice to be sure you can really use all of the detectors’ functions.
You should know that if you haven’t used before a pulse induction detector, you will need some time to get used to the slower speed with it.
The synchronization work with the frame between the two operators is very important. The one who works with the search frame is responsible for setting the time and the distance between the frame and the land, while the other one has the role of “air cushion”, he is responsible for making the frame stable.
Normally the frame must be on 20cm. over the ground during operation.
THRACE TERRA 2 PULSE INDUCTION METAL DETECTOR
Characteristics:
– Principle of work: pulse Induction
– Working frequency: varies from 450Hz-650Hz
– Search coil included in the main package: 1.2×1.2 m
– Search coil – additional option 36 cm with a handle /order below, choose from the options/
– Headphones – additional option – professional / order below, choose from the options /
– Batteries: 2800 mAh
– Charger – 220V – included in the main package
– Discrimination: analogue
Base set includes:
– electronic box with protector
– Search coil included in the main package: 1.2×1.2 m
– Batteries: 2800 mAh
– Charger – 220V – included in the main package
Thrace terra 2 parts for control
– “ON / VOLUME” – switches on the detector and volume control/max if you don’t use headphone/.
– “FREQUENCY” – you can change the working frequency of the detector in range 450Hz-650Hz.
– “THERES HOLD” – used to adjust threshold level. Rotate the controller counter-clockwise to low position to avoid interference. Clockwise rotate the controller to have high hum level.
– “DELAY” – used to balance on the ground or to reduce the impact of mineralization of soil, if necessary, and to eliminate certain undesirable metals in DISC mode. With this knob you can adjust the sensitivity of the detector, and to adjust the degree of selection for small objects.
– “GND / DISC” – dual control knob – adjust ground balance in ALL METAL mode, and discrimination in DISC mode. This knob is used for eliminating the impact of the ground in ALL METAL mode, and for regulation of discrimination of unwanted objects or magnetic alloys in DISC mode.
– Button “DISC” – switch on and switch off DISC mode.
– Button “MODE” – toggling between Dynamyc and Static modes.
– Button “ZERO” – serves for automatic setting of the device to ground conditions of the terrain as well as for quick null of each change of the values of DELAY TRESHOLD. It can also be used for quick recovery of the device USE ONLY IS STAT MODE!
– Button “LIGHT” – switch on and switch off LCD back light.
– Jack CHARGE back panel – to charging storage batteries.
– Jack PHONE front panel for headphones
– LCD for graphic display pointing level of signal and discrimination, selected modes and the batteries status.
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