User manual WHITES ELECTRONICS TM 808

[. . . ] Instruction Manual (English Edition) TM 808 NOTE: To locate large metal in normal conditions, set the controls as shown above. Cross these areas from at least two sides ( X ) to pinpoint target location. When AUTOMATIC THRESHOLD is in AUTO, detector must always be moving to respond to targets. NO-AUTO doesn't require motion to respond to targets. A Message from. . . [. . . ] The GROUND BALANCE control and the SIGNAL BALANCE control work hand in hand to tune out undesired responses, and provide the deepest possible penetration (detection depth). (9) Description of Controls continued. . . . . AUTOMATIC THRESHOLD ZUMBIDO DE AUTOAJUSTO AUTO NO AUTO The AUTOMATIC THRESHOLD control is used to activate (AUTO), or disable (NO-AUTO), the automated threshold resetting feature. 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 electronic 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. 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. 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. (10) Description of Controls continued. . . . . PUSH BUTTON The PUSH BUTTON is located on the tip of the carrying handle. Raise the instrument approximately six inches further above the ground. If the THRESHOLD hum changes little or not at all, the initial GROUND REJECT control setting "NORMAL" is adequate for searching in that particular area. Switch the AUTOMATIC THRESHOLD control to the AUTO positions and proceed to search. 5) However, if the THRESHOLD hum does change as the instrument is lifted, leave the AUTOMATIC THRESHOLD control in the NO-AUTO position and proceed to adjust to the ground in the following manner: (12) Ground Balance Procedure A. ) If the THRESHOLD level decreased or faded when the instrument was lifted, turn the GROUND BALANCE control slightly counterclockwise toward (-). Lower the unit back to arm's length, press and release the PUSH BUTTON control, and again raise the instrument about six inches further above the ground while listening to the THRESHOLD hum. If the THRESHOLD still decreases or fades, then repeat this procedure until the THRESHOLD level remains about the same as the instrument is raised about 6 inches further above the ground. B) If the THRESHOLD level increases or beeps when the instrument is lifted, then just the opposite procedure as described above is required. Lower the unit back to arms length, press and release the PUSH BUTTON control, and again lift the instrument about six inches listening for any change in the THRESHOLD hum. Again these procedures (A and B) need to be repeated until the THRESHOLD level changes little or not at all, as the instrument is raised about 6 inches further above the ground. C) Remember to press, hold for a second, and release the PUSH BUTTON on the handle after each adjustment (13) Lift about six inches if threshold fades, turn Ground Balance slightly counterclockwise, (-) lower, press & release Push Button, and again lift listening to threshold. Lift about six inches if threshold increases, turn Ground Balance slightly clockwise, (+) lower, press & release Push Button, and again lift listening to threshold. Ground Balance Procedure Continued. . . is made to the GROUND BALANCE control while the detector is held at arms length like a suitcase. Determine whether the sound increases or decreases when the detector is raised about six inches further above the ground and make the appropriate GROUND BALANCE correction. [. . . ] 4) Care must be taken so that the front and or rear antennas are not bent during storage or use. These are precision parts, their function and performance are very much altered by physical shape and dimensions. With the batteries removed from the holder, use a screw driver, or finger nail file, to clean any build up of residue on the contacts inside the holder and on the contracts on the lid. The contacts on the outside of the battery holder may also need to be cleaned if residue is visible. [. . . ]