Anfibio Ground Balance
Ground balance can be performed in three ways with the Anfibio: Automatic, Manual and Tracking.
When the GB button is pushed while performing automatic or manual ground balance, the device will switch to the General Search (GEN or GEN Delta) mode automatically on the background without any indication to the user, regardless of the selected search mode.
Upon completion of ground balance, current ground balance value is shown in the Ground Balance (GB) box on the right side of the display.
Automatic Ground Balance
Automatic ground balance is performed as follows in all search modes:
1) Find a spot where there is no metal.
2) Push and hold the GB button down (GROUND BALANCE value and “Pump Coil” warning message will be shown on display) and start pumping the search coil up and down from about 15-20 cm (~6”- 8”) above the ground down to 3 cm (~1”) off the ground with smooth movements and keeping it parallel to the ground.
3) Continue until a beep, indicating the completion of ground balance, is heard. Based on ground conditions, it usually takes about 2-4 pumps for the ground balance to be completed.
4) Upon completion of the ground balance, ground balance value is shown on the display (GB). The device continues to ground balance and produce a beep sound as long as you keep the GB button pushed down and pump the coil. In order to ensure that the ground balance is proper, ground balance at least 2-3 times and check the ground balance values on the display. In general, the difference between the values shall not be higher than 1-2 numbers.
5) If you cannot ground balance, in other words, if no beep sound is produced, it means that either the ground is too conductive or not mineralized or there is a target right below the search coil. In such a case, retry ground balance at a different spot. If you still cannot ground balance, read the section titled ”Important Details Concerning Ground Balance”.
When the ground balance button is released, the device continues to operate in the GEN or GEN Delta mode for a short period of time and the ground balance value stays on display. This makes it possible to manually fine tune the automatic ground balance value. Refer to the following “Manual Ground Balance” section for further information regarding this feature. If this is not desired, press the PP button once to return to the main screen.
NOTE: If the iSAT value is set high, the device may not auto ground balance. In such a case, lower the iSAT value in GEN Delta mode in the Anfibio Multi or in GEN mode in the Anfibio 14 or Anfibio 19 models first. After ground balancing, set the iSAT back to its original position.
Manual Ground Balance
Allows you to manually modify the ground balance value. It is not preferred mostly because it takes time. However, it is the preferred option in cases where a successful ground balance cannot be performed using other methods or minor corrections are required to the automatic balance.
Anfibio is designed to allow for automatic ground balancing conveniently on any type of ground. Therefore, it is recommended to perform automatic ground balance upon start up. However, the ground may not be suitable for automatic ground balancing in some cases and the device cannot ground balance on such grounds. For instance, wet beach sand, soils containing alkali or salty water, trashy sites, ploughed fields, highly mineralized grounds and grounds with very low mineralization are not suitable for automatic ground balance. In such terrains, if you are using the Anfibio Multi or Anfibio 14 model, you can auto ground balance in the BEACH mode and then switch to other modes or try manual ground balancing. If you are using the Anfibio 19 model, try manual ground balancing. However, manual ground balance requires a skill which develops over time through practice.
To perform manual ground balance:
1) Find a clear spot without metals and switch the device to the GEN Delta mode in the Anfibio Multi or GEN mode in the Anfibio 14 and Anfibio 19 models.
2) You need to listen to the sounds coming from the ground in order to perform manual ground balance. Pump the search coil up and down from about 15-20 cm (~6″- 8″) above the ground down to 3 cm (~1”) off the ground with smooth movements and keeping it parallel to the ground.
If the sound gets higher when lifting off the search coil above the ground, the ground balance value is too low, in other words, the effect from the ground is negative and the ground balance value needs to be increased by using the ( + ) button. On the other hand, if the sound gets higher when lowering the search coil to the ground, the ground balance value is too high, in other words, the effect from the ground is positive and the ground balance value needs to decreased by using the ( – ) button.
3) Push the ground balance button once and release it. The ground balance value will be shown on the display and remain there for a moment. You can return to the ground balance screen by pushing the ground balance button if the screen switches.
Manual ground balance functions within the range of 0-99.80 However, each value covers 5 steps used for fine tuning within itself and these steps are indicated as multiples of 20 in the Ground Balance window (GB). For example, ground balance value shown on the side is 70.80.
Press plus ( + ) or minus ( – ) to increase or decrease the ground balance value, respectively. If the button is pressed once at a time, the values count one by one and if it is held down, the values will change quickly.
4) Repeat the above procedure until the sound heard from the ground is eliminated.
The sound may not be eliminated completely in some areas. In these cases, listen to the sounds produced when moving the search coil towards and away from the ground to check if the ground balance is correct. If there is no difference between the two sounds then the ground balance is set properly.
The device will return to the main screen automatically after a short period of time upon completion of ground balance. To return to the main screen instantly, just press the PP button once.
IMPORTANT! Experienced detectorists adjust the ground balance setting to a slightly positive response (weak but audible sound is produced when moving the search coil closer to ground). This method may produce favorable results for experienced users in certain fields where small targets are searched for.
Ground Tracking (Tracking)
In this option, the user does not need to make any adjustments. TRACKING feature is activated from the OPTIONS menu by switching it to 01 position. The word “Tracking” is displayed at the bottom of the GB window. The device updates the ground balance automatically as long as the search coil is swung over the ground and shows the ground balance value in the GB window. It does not provide any feedback to the user (like the beep sound in automatic ground balance).
While tracking is active, the device can initially produce a loud signal when it detects a different ground structure (for instance a mineral rock) or a target. In this case, swing the search coil over the spot where the device produces the signal . If the sound remains the same and the device shows an ID, it is possibly a target. If the sound attenuates too much or is lost after a few swings, it means that the device has produced a signal for the different ground structure or a stone.
NOTE: It is recommended that you use tracking in the General Search mode (GEN Delta or GEN) and not in the discrimination modes.
Tracking is suitable for use in areas where different soil structures are present within the same land or in fields where mineralized rocks are scattered widely apart. If you use ground tracking in areas where hot rocks are intensely present, the device may not be able to eliminate these highly mineralized rocks or you may miss the smaller or deeper metals.
IMPORTANT! Ensure that tracking is off during air tests. Otherwise, the device will attempt to perform ground balance on the target and the depth will be reduced.
Ground Balance Value
Ground balance value provides information about the ground you are searching on. Some typical ground types are as follows:
“0-25 Wet salt water or wet alkali soils 25-50 Wet salt water and wet alkali soils covered with dry layers
50-70 Regular, low-quality soils 70-90 Highly magnetic soils, magnetite or maghemite and similar highly mineralized soils, black sand”
Important Details Concerning Ground Balance
1) Upon start up, the ground balance value is set to 90. The device can perform ground balance automatically within the range of 20-99.80 in all modes and 00-99.80 in the BEACH mode present in the Anfibio Multi or Anfibio 14 models.
2) If the ground mineralization is too low, automatic ground balance may fail to work in other modes except for the BEACH mode. In such a case, if you are using the Anfibio Multi or the Anfibio 14 model, you can auto ground balance in the BEACH mode and then switch to other modes. Because the Anfibio 19 model does not have a beach mode, you can try manual ground balancing in this model.
3) You can test the accuracy of the ground balance with the pinpoint mode. After ground balancing, if you receive no sound or a weak one when you move the search coil closer to the ground in the pinpoint mode, then the ground balance is successful. If the sound gets louder when you move the search coil closer to the ground, then the ground balance is not successful. In this case, simply change your location. If ground balance is not possible despite these efforts, you should continue your search without performing ground balance.
You cannot search in the General Search (GEN Delta or GEN) mode without ground balancing. You need to use one of the discrimination modes and increase the DISC. value until the noise is eliminated.
4) Once the ground balance is set, it will remain satisfactory for a long time in most areas. However, if you encounter an excavated, backfilled or geologically composite soil structure, a ground balance should be performed again to adapt to the varying soil structure. In addition, re-ground balancing is recommended for the Anfibio Multi model if you change the operating frequency of the device (5kHz/14kHz/20kHz) in certain ground conditions.
5) When using the optional large coil, pump the coil more slowly and do not keep it very close to the ground.
6) In some cases where the iSAT value is set high, the device may not be able to ground balance automatically. In such a case, first lower the iSAT in GEN Delta or GEN mode and after ground balancing switch it back to its previous position.
Anfibio User Manual : https://www.noktadetectors.com/anfibio-user-manual/
Anfibio Series : https://www.noktadetectors.com/anfibio-series/