User manual WHITES ELECTRONICS MXT

[. . . ] MXT Table of Contents MXT Table of Contents Chapter 1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Chapter 2 Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Standard Battery Holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] When ground mineralization is too high for the current GAIN control setting, the display indicates "OVERLOAD-REDUCE GAIN/LIFT LOOP" along with an audible "squawk". On occasion, while searching, you might sweep the loop over a very large or very shallow target. The message on the LCD display will read "OVERLOAD-REDUCE GAIN/LIFT LOOP". All such targets should be checked by sweeping the loop a little higher over the area and noting the display and audio indications. The MXT will self correct after the message and you can continue to search as normal. GAIN Control Gain Adjustment 1. Starting from the POWER OFF position and going clockwise, the power is turned ON and the dial increases the GAIN from a minimum level of "1" to a maximum level of "+3". Set the control to the "Initial Setting Triangle" ( between level 9 & 10 ). Although the setting of (9-10) gives more than ample GAIN, if the ground mineralization is low enough, you might attempt to raise the GAIN above this level toward +3. NOTE: Ground Mineralization too high, large or shallow target message. 18 Chapter 5 MXT Controls Chapter 5 MXT Controls Gain Adjustment (continued) GAIN Control 5. In the Prospecting MODE the use of the SAT (variable self-adjusting threshold) control will help to maintain a smooth THRESHOLD "hum" particularly at higher GAIN settings and will be covered in a later section. While using a steady slow search coil sweep speed, simultaneously advance GAIN towards "+3". If the "OVERLOAD-REDUCE GAIN/ LIFT LOOP" alert keeps popping up on the display, if a quiet smooth background THRESHOLD "hum" doesn't continue, or if ground noises are a problem reduce GAIN. capability of the MXT also functions more accurately when the GAIN is set at a level which allows for smooth operation. Too much GAIN can cause bad ground to distort the proper identification of iron and non-iron targets. Note: It is normal to hear changes, clicks or soft beeps, coming from the audio (speaker) during GAIN adjustments as the circuit shifts between hardware and software gains (different electrical parts of the circuitry). The GAIN control adjusts both the hardware gain (hard physical component) as well as the software gain (computer code) alternating between the two throughout it's range. As the MXT shifts between these two intricate parts of the circuitry an audio indication notes the transitions. If you adjust the Gain slightly, the audio notes a significant rather than slight change. The MXT provides more GAIN control range than is typically useful assuring performance is not left on the plate due to restricted assess/range. Likely few areas will allow maximum GAIN (full clockwise) without at least some degree of radical (noisy) operation. Setting in the + area requires a high degree of operator skill. SAT SPEED CONTROL (Prospecting Mode Only) Gain Adjustment (continued) If, of course, "OVERLOAD-REDUCE GAIN/ LIFT LOOP" message is displayed common for very nasty ground mineralization, you must heed it and reduce the GAIN rather than raise it. The object of increasing the GAIN is to get the maximum available depth from the detector WITHOUT causing the "OVERLOAD-REDUCE GAIN/LIFT LOOP" message to appear which indicates an overload of the circuit. In addition, any increase in GAIN adjustment should NOT BE at the expense of maintaining a smooth and constant THRESHOLD "hum". [. . . ] Double check the obvious, such as batteries, and try the detector in another area to be sure there is not interference. Be sure to send all necessary parts with your detector, such as search coil, batteries and holders, as these items can result in symptoms. Always include a letter of explanation about your concerns, even if you have talked to the Service Center by telephone. Take care in packaging instruments for shipping and always insure your package. 33 Chapter 7 MXT Information Chapter 7 MXT Information Warranty If within two years (24 months) from the original date of purchase, your White's detector fails due to defects in either material or workmanship, White's will repair or replace at its option, all necessary parts without charge for parts or labor. [. . . ]