![Ака Signum 7272M MFT version 1.00 [10/34] Ground balance](/img/pdf.png)
Ака Signum 7272M MFT version 1.00 [10/34] Ground balance
![Ака Signum 7272M MFT version 1.00 [10/34] Ground balance](/views2/2041883/page10/bga.png)
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ООО «фирма «АКА», +7(495)621-0481, http://aka.2000.ru aka_md@mail.ru
Селективный металлодетектор «Сигнум MFT» 7272М. Руководство по эксплуатации.
To change any of these
settings press the appropriate
button. The value of the selected
option is highlighted on the screen
with a rectangle around the
appropriate value.
Press the button
Fig. 6
Or to set the required
value. In order to exit the
parameters simply click the button again
.
When neither the RT, ST or Volume
values are displayed on screen - the buttons and will now act as
on / off modes for the Turbo and S-algorithm, (see below)
GROUND BALANCE
Balancing the device to the ground is the single most important part of the
device settings for accurate search results. Improper ground balancing can result in
decreased responses to targets and may result in instability as well as an increase in false
ground signals.
To explain the basic physics behind the ground balance procedure. Every object
has its own shape, conductivity and magnetic component, which together are called the
VDI (Visual Digital Index). Remember that the VDI is the angular response that is
numerically equal to the angle of deflection of the signal vector time curve (hodograph
display) on the vertical axis. The soil, or ground, depending on the degree of
mineralization (presence of iron oxides) imposes its signal on the target signal thus
changing the VDI upscale. This is especially true on small or deep targets, as well as large
highly conductive targets (copper, silver, aluminum). This can actually push these high VDI
targets up and over into the high negative VDI range known as “VDI wrap around”. To
minimize this effect, it is crucial to perform a proper and accurate ground balance
procedure.
The basic objectives of balancing:
1.
Make the soil 'invisible' to the instrument, i.e. exclude false signals
from the ground where there is no target.
2.
Install the correct (standardized) reference system number for the VDI
.
When receiving a signal from both the ground and a detected object the
detector must subtract mathematically the signal from the ground in
order to display a correct VDI indication of the detected target
Keep in mind that when performing “air tests” inside after the detector has been
previously balanced in soil may result in incorrect VDI readings. This is due to the
correction factor for the VDI previously set in the last ground balance. This may result in
the loss or “invisibility” of large aluminum, silver and copper targets. If the ground setting
is too positive the VDI will be offset positive and vice versa if the ground balance is
negative.
Содержание
- Discriminating metal detector 1
- Instruction manual 1
- Signum mft 1
- Contents 3
- General description 4
- General information 4
- Package contents 5
- Technical specifications 5
- Getting started 6
- Power supply 6
- Controls and connections 7
- Display screen 9
- St sensitivity rt sensitivity volume 9
- Warning setting of the st sensitivity above 11 and especially 14 can lead to a significant increase in the amount of false positives from the soil in high salinity or when bumping the search coil 9
- Ground balance 10
- Make the soil invisible to the instrument i e exclude false signals from the ground where there is no target 10
- Successiv 12
- Discrimination search mode and setup 14
- Search mode all metal 15
- Dynamic and static modes 16
- Mode economy 17
- Mode s algorithm 17
- Mode turbo 17
- Multi frequency 18
- Parameter menu 19
- Search options 19
- Accumulation 20
- Attention the algorithm is turned off automatically in the program 20
- Backlight 20
- Display settings 20
- Mm1 and mm2 20
- Shift frequency 5 the central frequency of the device 5 20
- 2 1 4 1 7 21
- Real time before the threshold short tone 21
- Real time multifrequency 21
- Sound settings 21
- Additional menu add menu 22
- Menu options 22
- Other settings 23
- Tone settings rt 23
- Tone settings st 23
- User programs 23
- Always go back to them to perform this you must first turn on the device while at the 24
- Factory default values for all parameters are stored in memory and the user can 24
- However one should pay attention to two points unless absolutely necessary do not place a high value for the backlight setting doing so may reduce the operation time with one set of batteries it is also not recommended to set too high a level for the parameter duration st when working in trashy areas for a clearer separation of closely spaced targets 24
- Program 2 designed to search in trashy areas has a good response but slightly inferior in sensitivity program 3 is the main program of research combining the best combinations for a comfortable search with near maximum sensitivity program 4 for when you want to search at slightly greater depths however it is worth remembering that it reduces the comfort of searching identifying deteriorating properties of the device as well as the time from one set of batteries is reduced by 2 3 times remember that the default settings are not an absolute but offered only as a starting point to assist your search experiment and we hope that in the near future you will make your own comfortable and effective progra 24
- Same time holding down the button and hold it until the end of the melody same time holding down the button and hold it until the end of the melody program 1 is designed for easy and comfortable search of shallow objects 24
- Settings backlight contrast and cont ct directly with the search capabilities of 24
- The device are not affected and can be chosen based on the preferences of the particular user 24
- Using the hodograph for identification 25
- Replacing the coil 26
- Search and identification methods 26
- Normal operating mode 28
- S mode algorithm 28
- Large eddy current loops 30
- Searching for metal objects with 30
- Examples of some common target 32
- Us 5 cent nickel 32
- Warranty information 33
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