Aka Sorex 7281 version 104 User Manual

Selective Metal Detector «Sorex» 7281. Operating manual 
AKA LLC+7(495)623-4026 621-0481 http://aka.2000.ru  [email protected] 11 
 «S» menu. 
To enter the «S» menu press and hold  on the device panel. To browse its 
entries press the same button several times.  
To  adjust  parameters  use  buttons    and .  Press  for  exit  or 
automatic exit 7 seconds after the end of the adjustment 
 
Menu entries. 
1. General Boost  
2. FGR Filter (false ground response) 
3. HRN (hot rock neutralization) on/off 
4....

Selective Metal Detector «Sorex» 7281. Operating manual 
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HRN (Hot rock neutralization) on/off.  
This  option  allows  turning  on/off  non-discrimination 
algorithm  of  hot  rock  signal  neutralization.  When  it  is  turned 
on,  most  of  the  round-shaped  rocks  do  not  give  identification 
signal,  only  the  threshold  tone  with  a  light  sound  increase 
appears.  The  search  becomes  more  comfortable  in  the  area...

Selective Metal Detector «Sorex» 7281. Operating manual 
AKA LLC+7(495)623-4026 621-0481 http://aka.2000.ru  [email protected] 13 
Economy mode (only for version 1.04) 
 The  key  feature  of  this  mode  is  a  shift  to  a  low  power  consumption  resulted 
from the reduction of ECC excitation current. Upon that, detectors runtime may reach 40 
hours  (with  2800  mAh  battery).  Besides,  this  mode  allows  performing  ground  balancing 
more  accurately  when  working  at  the  highly  mineralized...

Selective Metal Detector «Sorex» 7281. Operating manual 
AKA LLC+7(495)623-4026 621-0481 http://aka.2000.ru  [email protected] 14 
set a piece of ferrite to the centre of the search coil surface from the distance of 25-30 cm, 
finishing  the  balancing.  Puzzled?  Lets  make  it  easier:  Take  a  CD  and  pass  it  flatwise  in 
front of the search coil. If the CD gives vertical hodograph and VDI within -1 0 +1, then the 
device is ready for the air tests. 
If  VDI  of  the  CD  differs  from  these...

Selective Metal Detector «Sorex» 7281. Operating manual 
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After  you  have  learned  how  to  choose  the  balancing  area,  memorize  the 
approximate  balance  digit  in  lower  left  corner  of  the  screen  in  the  balancing  mode.  Its 
sharp  difference,  especially  in  same  weather  conditions,  during  next  balancing  may  be 
caused  by  metal  in  the  ground,  and  you  should  change  the  ground  balancing  area  for...

Selective Metal Detector «Sorex» 7281. Operating manual 
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Find  a  clear  area,  60  cm  wide.  Go  to  manual  setup  mode    and  making  short 
horizontal search passes (but quicker) with a 50 cm amplitude, 3-5 cm above the ground, 
you will see a straight ground line on the screen (if it jerks, there is a metal). Upon that, if 
the  balance  is  incorrect,  you  will  hear  a  buzz  from  the  ground  and  onscreen  ground line...

Selective Metal Detector «Sorex» 7281. Operating manual 
AKA LLC+7(495)623-4026 621-0481 http://aka.2000.ru  [email protected] 17 
choose  the  optimum  frequency  of  the  excitation  current  for  these  temperature 
conditions.  Thereby  all  basic  device  parameters  are  sure  to  be  kept,  including  absorbed 
current.  
In  sea  beach  operations  and  other  complicated soils  with  high  conductivity  we 
recommend to use the General Boost option for better balancing accuracy. Sometimes...

Selective Metal Detector «Sorex» 7281. Operating manual 
AKA LLC+7(495)623-4026 621-0481 http://aka.2000.ru  [email protected] 18 
Position of some metal targets on the VDI scale(for 7 
kHz search coils). 
VDI Scale Objects 
From -90 to -86 hot rocks, incorrectly set up ground. 
From -86 to -70 small nails and other metal scrap. 
From -70 to -50  medium size wrought nails, small arrow heads. 
From -50 to -35 large  wrought  nails,  medieval  knives,  flat  arrow  heads,  horseshoes, 
locks and other fairly...

Selective Metal Detector «Sorex» 7281. Operating manual 
AKA LLC+7(495)623-4026 621-0481 http://aka.2000.ru  [email protected] 19 
Discrimination Sector Setup. 
To  setup  required  discrimination  sector,  press   
several  times,  select  entry  setup  left  discriminator  border. 
You  will  see  a  VDI  digit  in  the  square  frame  above  the  left 
border of the discrimination sector. Use buttons and  to change this number, 
moving  the  border  to  the  left,  increasing  range  of  targets...

Selective Metal Detector «Sorex» 7281. Operating manual 
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Static mode (Pin-Point) 
This  mode is used basically as a  secondary mode to clarify target  location in the 
ground.  After  target  detection  in  dynamic  mode  (primary  search  mode),  put  the  coil 
slightly aside from the assumed target location and press .  
Warning!  Avoid  turning  this  mode  on  in  the  zone  of  target  sensitivity  (put  the 
coil rather far...