White’s Electronics GM24k, Руководство для продвинутых пользователей

Страница: 15 / 32

Chapter 4 GM24k Controls
Disc Setting
(2 bars)
Iron Cancel (tap)
Disc. Adjust (hold)
Iron Cancel (Discrimination)
When detecting for gold nuggets it is often best
to “dig it all.” Gold can have various shapes,
sizes, be embedded in iron rock, so it’s impos-
sible to account for every nugget in the ground
and only dig gold. However, in challenging
conditions the electronic prospector may need
to adjust the GM24k to cancel out unwanted
targets or heavy ground mineralization. This is
done at the expense of some sensitivity, but in
extreme conditions the amount of signals can
overwhelm your senses, causing “ear fatigue.”
In these cases the real battle is in finding good
targets, not raw depth.
Situations where you might need to use Iron
Discrimination are: rapidly changing ground
minerals, high concentrations of hot or cold
rocks, old mining camps with iron trash, highly
variable ferrous ground conditions.
Iron Cancel Adjustment
To enable Iron Cancel in either Beep or Zip mode, tap the Nail Icon. This will engage the Iron Cancel
feature at the default setting. You can adjust this setting up or down by holding the Nail Icon, then using
the Up and Down buttons to set the discrimination range. Best practice is to only use what is required for
smooth operation of the GM24k, as too high of an Iron Cancel setting will decrease the detector’s sensi-
tivity to small gold nuggets. Again, this is a trade off - it is up to the operator to pick the balance between
a smooth threshold and maximum sensitivity. If you are getting a lot of high signals from hot rocks, tap
the LOCK button while in the Iron Cancel adjustment mode. This will block out a range of signals from
94-99.
Please note that unlike coin detectors, the threshold will not go silent over discriminated targets in the
“Zip” (all-metal) audio mode. This is to ensure smooth operation and combat ear fatigue. You may find
that it is best to detect with Iron Cancel off, and then toggle it on to check a target. Very small gold will
often report a very weak target ID number, or none at all, so this setting is best used as a last resort in
only the most challenging conditions.
13