9
Take a look at the illustration above and note how the
discrimination level (as well as sweep speed and ground
mineralization) affects the search coil detection pattern. Not
only is depth reduced at high discrimination levels but also the
width of the pattern is reduced. This change in width has a
very important implication: if you’re searching at a high level
of discrimination you’ll have to sweep almost directly over a
target to get a response. The higher the degree of ground
mineralization, the more pronounced this effect.
This is where the 1266-X dual discrimination system comes in.
Set DISC 1 at a low level (like 2 or 3) and DISC 2 at a higher
level (6 or 7). As you search in DISC 1 you’ll have a better
chance of finding good targets. Of course, you’ll get more
trash too, so when you do get a response, switch over to DISC
2. If you still get a good response, dig it, keeping in mind that
had you been searching at a high level of discrimination you
may well have missed this one. This is the preferred method of
searching in relatively non-trashy soil.
In very trashy soil however it is generally easier to search
with DISC 1 at a high level of discrimination (at the pull-tab
discrimination point for example) and DISC 2 at a lower level
of discrimination (3 for example). In this manner a good target
4
1
2
3
Figure 4. Search coil detection
pattern and the effects of
sweep spread, discrimination
and ground mineralization.
Motion Mode.
1. Minimum Depth
a. Very slow or fast sweep speed.
b. Discrimination set at “10.”
2. Good Depth
a. Moderate sweep speed.
b. Discrimination set at “5.”
3. Maximum Depth
a. Moderate sweep speed.
b. Discrimination set at “0.”
4. Missed Target
Many targets within the range of
your 1225-X will not be
detected unless you closely overlap
your swings.
DUAL DISCRIMINATION
