21
The
ATS
control affects all modes; a setting of 8 is recommended, especially in
salt-surf environments.
NOTE:
If the coil is swept exceptionally slowly, a faster retune speed can
substantially reduce depth. For the deepest results, use a slow retune speed and
sweep slowly.
Reject Control
The
Reject
control determines the amount of iron rejection. It applies to
Tone
,
Mute
,
and
Volcanic
modes. A high
Reject
level also rejects highly conductive targets like
larger silver coins; on rare occasions, large gold items (such as a large heavy ring) can
fall in this range.
Reject
should be used only when there is an abundance of iron.
Reject
is best adjusted using an example target you want to reject. A sample iron nail
is included with the Impulse AQ Limited.
1.
Choose
Tone
,
Mute
or
Volcanic Sand
mode.
2.
Set the
Reject
control to 0 and the
ATS
to 8.
3.
Put the reference iron target on the ground in horizontal position.
4. Swing the coil over the target at a height of around 4 inches while slowly
increasing the
Reject
control.
5.
Stop when the nail responds as follows:
a. In
Tone
mode, the iron response is mostly low tone with some minor
high tone mixed in.
b. In
Mute
mode, the iron response is mostly silent with some minor high
tone breaking through.
c. In
Volcanic Sand
mode, the iron response is fully silent which is
necessary to reject volcanic ground.
6.
Optionally, test a US nickel to verify that it gives a high tone.
When setting up iron rejection, both the
ATS
and
Reject
controls affect each other so
should be adjusted in coordination with one another to achieve the desired rejection
responses. It is highly recommended that iron rejection is set up in the field using test
targets.
USER CONTROLS
(Continued)
