Automatic Threshold - Whites TM 808 Instruction Manual

Description of Controls continued.....
The AUTOMATIC THRESHOLD control is used to activate (AUTO),
or disable (NO-AUTO), the automated threshold resetting feature. This feature
offers automatic threshold maintenance. When AUTO is used it allows the
threshold hum of the detector to remain smooth or constant regardless of small
changes in the ground mineralization, or upward / downward drift of the electron-
ic signal. When NO-AUTO is used changes in threshold which are normal for
such instruments, require manual resetting (squeezing and releasing the PUSH
BUTTON on the handle).
IMPORTANT: The detector must be kept in motion when using the
AUTO position. Standing still over the target will cause the target signal to fade
away.
In the NO-AUTO position, AUTOMATIC THRESHOLD is not functioning.
Use this position when adjusting the GROUND REJECT control to compensate
for the ground. It can be used as a searching mode if the ground mineralization
does not change rapidly, and there isn't external interference from radio signals
etc. In the NO-AUTO position the detector does not have to be kept in motion
when passing over the target. You can stand over the target without the target
signal fading away. It can be valuable to help pinpoint the center of a deep
target. When using this NO-AUTO position it will be necessary to press and
release the reset button on the end of the handle at regular intervals, to keep the
threshold hum constant and free from upward or downward drift. If the threshold
sound gradually increases or decreases while searching, press and release the
button to return the detector to the normal threshold hum. This requires skill and
experience, most users should operate in AUTO until some field experience is
gained.

AUTOMATIC THRESHOLD

ZUMBIDO DE AUTOAJUSTO
AUTO
NO AUTO
(10)