|5 Search Procedures|
Searching with the PULSE STAR II is particularly easy when the 1m coil is carried by two people. With the help of a special long shoulder strap, the 1m coil can be used by a single person: one hand directs the coil, leaving the other free to operate the electronics unit. Before beginning to search, select the desired switch position of SAMPLING DELAY with NORMAL or SILENT mode (see chapter 2 and 3). Searching in SILENT mode is recommended when maximum sensitivity is not really required, i.e. for objects not buried very deep.
In areas where a lot of uneven ground has to be covered, it is advisable to search systematically. You should grid large areas with poles and strings (strips approximately 32 inches wide). If using a two meter by two meter coil then grid off areas approximately 64 inches wide. It is also important that the grid areas are overlapping while searching because the search coil has its highest sensitivity in its centre.
Walk on the grid areas at a slow walking pace. Should the surface allow it, hold the search coil at a constant height of about four to eight inches from the ground. Should the tick-rate change due to magnetic soil (for example caused by large concentrations of iron oxides), move the MODE switch momentarily to RETUNE. You do not have to hold it for more than a split second. Iron oxides can cause the tick-rate to increase (see chapter 6).
|We would like to remind you (again) that both persons should have no metal on their shoes or boots. The person carrying the PULSE STAR II should place it on the side of the body away from the coil.|
|When first receiving a signal, it is advisable to obtain more information
about the object detected. You can learn, with experience, if the buried
object is large and possibly how deep it may be buried.
The strength and duration of the signal will give you this information. For example, a small object buried only a few inches deep, will give two signals as each edge of the coil passes (see Fig. 9). By moving the search coil higher, the small object will disappear.
With the help of the 10 inch coil you can also identify small objects shallowly buried. An object of the size of a soft drink can (for example), buried approximately 20 inches deep, will give a very clear signal (see Fig. 10).
On a large object buried deep, you will receive a longer signal indication (see Fig. 11). To determine the exact location of a buried object, walk slowly further in the direction of the strongest response. When you feel that the exact spot has been reached, place a marker on the ground, then change directions. Approach the buried object at right angles (90° to the right and left) of the original path to obtain a further optimum signal.
If you receive a very strong signal, it is advisable to momentarily move the MODE switch to RETUNE while over the object. The sensitivity will be greatly reduced and you will receive a peak signal directly over the object. Do not forget to RETUNE again to reset the sensitivity before carrying on searching.
You can also determine the kind of metal (ferrous or non-ferrous) of any object with 4 inch diameter or larger as long as it is within the metal discrimination range (approximately 60 to 80% of the normal detection range). See also chapter 1 (Function) for details about the discrimination feature.
In order to identify the object, motion of the seach coil is required. You must walk steadily across the buried object and observe the LEDs on the meter (or you may move the MODE switch to SILENT to obtain an additional audible identification). If a weak signal is received, it is advisable to repeat the measurements several times to obtain a clear indication (ferrous or non-ferrous) of the object that has been located.
|IMPORTANT: Between each measurement a minimum pause of three seconds is required. The LEDs have to be off and the meter needle has to come down to zero. Only after this pause the next measurement can be made. This will allow the PULSE STAR II to retune itself.|
The metal discrimination for the PULSE STAR II was developed with the 10 inch (25cm) round coil and the one meter coil. Using the large two meter coil may cause some false identifications with metal discrimination.
|IMPORTANT: Do not forget to turn off the PULSE STAR II after each search! Otherwise, the battery will be completely discharged and may lose some capacity to recharge. Total damage may also occur (see chapter 7 and 10).|
A further note: If you should hear short continous beeps every seven seconds then the battery is low. You will be able to search for approximately twenty more minutes, nevertheless, you should recharge the battery as soon as possible.
|Chapter 4||Chapter 6|