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. Walk briskly, noting areas that produce an increase in sound - beep. 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. [. . . ] It should also be noted that the AUTOMATIC THRESHOLD control, which will be discussed in the next section, should be set in the NO-AUTO position while the GROUND BALANCE control is being adjusted. 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. 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 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. 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. (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. [. . . ] 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. CAUTIONS: Some "C" size batteries on the market today (usually uncommon brand rechargeable "C"s) are not the appropriate physical length to work properly in your battery holder. Compare the length of standard batteries to any rechargeable, or off brand battery, prior to purchasing. [. . . ]