Related Manuals for Whites TDI SL
Summary of Contents for Whites TDI SL
- Page 1 White’s Electronics, Inc. Sweet Home, Oregon USA Building the World’s Finest metal detectors for over 60 years.
-
Page 2: Table Of Contents
TDI SL Owner’s Manual CONTENTS Assembly ......... 3 Batteries and Charger . -
Page 3: Assembly
TDI SL Owner’s Manual Assembly Search coil Lower rod Arm cup Cam lock Clevis Rubber washers (2), fiber bolt Battery door 1. Remove all parts from the shipping carton and check assem- bly diagram to ensure all parts are present. - Page 4 TDI SL Owner’s Manual the floor. If the instrument fit feels uncomfortable, readjust clevis/lower rod length with spring clip button and cam- lock so that search coil can be held near the floor without stooping over. 6. Remove the protective paper from the two black arm cup foam pads.
-
Page 5: Batteries And Charger
TDI SL Owner’s Manual Batteries and Charger The TDI-SL includes a rechargeable NiMH battery pack as the primary power source, and a standard alkaline battery pack as a backup. Fully charged, they supply a nominal 12 volts (the NiMH may be slightly less) and will power the TDI-SL for about 4-5 hours. -
Page 6: Quickstart
TDI SL Owner’s Manual QuickStart 1. Set the switch to Conductivity 2. Set the offset to the midpoint. Frequency 3. Set the to ~8. Ground Balance 4. Turn on the power and adjust the to “2.” Gain 5. Adjust the to achieve a faint background hum. -
Page 7: Principles Of Pulse Induction
TDI SL Owner’s Manual Principles of Pulse Induction Pulse induction (PI) detectors are very different from tradi- tional induction-balance (VLF) designs. Instead of transmitting a continuous-wave magnetic field, the PI detector periodically transmits brief impulses of magnetic energy. The PI receiver then looks at the impulse decay for target (and ground) informa- tion. - Page 8 TDI SL Owner’s Manual out other minor trash targets at the expense of eliminating potentially good targets such as jewelry, but this method is very limited in the range of trash targets that are rejected. Furthermore, the ground balancing method used by TDI has a side affect with target responses.
-
Page 9: Controls
TDI SL Owner’s Manual Controls Threshold control sets the level Threshold at which the background audio tone is heard. In most cases, faint target sig- nals are easiest to hear when the thresh- old is set to a low but clearly audible level. -
Page 10: Pulse Delay
TDI SL Owner’s Manual that higher gain will always give better depth. In air tests this is generally true, but ground results can depend on the amount and type of mineralization. With the coil on the ground, increase the gain until the detector exhibits chatter, then back off slightly for a reasonably steady threshold tone. -
Page 11: Target Conductivity
TDI SL Owner’s Manual affects the ground balance point, so whenever Pulse Delay the delay is changed the ground balance should also be checked and re-adjusted. Higher pulse delays require a lower ground balance setting. Target Conductivity switch Target Conductivity... -
Page 12: Ground Balance
TDI SL Owner’s Manual Ground Balance This control is used to balance out the signal from ground mineralization. There is an position for which TDI runs in straight PI mode with no ground balance. To ground balance TDI the Target... -
Page 13: Frequency
TDI SL Owner’s Manual Frequency This control makes small adjust- ments to the transmitter pulse rate. This is used to counteract any interference which might be due to outside electro- magnetic sources, such as radio sta- tions, microwave, short wave, electric fences, power lines, lightening, electri- cal storms, or other metal detectors being used nearby. -
Page 14: Tdi In Depth
TDI SL Owner’s Manual TDI In Depth Ground Balancing One of the key features of TDI is its ability to balance out ground mineralization while maintaining pulse induction depths. This is achieved using a differential technique whereby two decay samples are compared; the... - Page 15 TDI SL Owner’s Manual With , all tar- Ground Balance Conductivity Mode gets will give an audio response, either a high or low tone. New users are encouraged to use this setup and practice with various targets to learn their audio responses. A US nickel or small gold nugget works well for a low conductive target, and a US quarter makes a good high conductive target.
- Page 16 TDI SL Owner’s Manual Setting the to either will cut Target Conductivity High out half of the response, as shown in the next diagrams. The Target Conductivity = LOW Target Conductivity = HIGH noise, which tends to be equally distributed between the high and low tones, is cut in half.
-
Page 17: Pulse Delay
TDI SL Owner’s Manual A lower threshold makes the TDI quieter and less chattery but also requires a stronger target signal to produce a tonal response: A lower threshold can be played off against a higher set- Gain ting, although you may find that the net outcome is about the same. -
Page 18: Dual-Field Coil
TDI SL Owner’s Manual ence. Sub-gram gold nuggets are often only detectable at the lowest delay setting while larger nuggets, even of the same alloy, can be detected at higher delay settings. This is largely due to skin effect, whereby the response of small thin targets dissipates quickly. - Page 19 TDI SL Owner’s Manual literally gives you two different size coils running simultane- ously: a larger outer coil for large target depth, and a smaller inner coil for small target sensitivity. As such, even the 12” DF coil, with its 6” inner coil, can pick up nuggets of only a few grains.
-
Page 20: Dealing With Noise
TDI SL Owner’s Manual Besides overlapping each sweep, it is important to keep the coil close and parallel to the ground. Pendulum-swinging the coil results in loss of depth, and if the ground balance isn’t per- fectly set the variation in loop height will create a ground response. - Page 21 TDI SL Owner’s Manual detectors due to the overwhelming number of EMI sources. If you cannot minimize noise with the Frequency control, then turning down the Gain or Threshold is your best bet. Excessive chatter will easily mask targets, plus results in audio fatigue. It is better to trade off sensitivity for smooth audio so you can hear the targets.
-
Page 22: Specifications
TDI SL Owner’s Manual TDI-SL Specifications Operating mode ......Pulse Induction Pulse Frequency ......2.6kHz - 3kHz Pulse Delay. -
Page 23: Warranty
TDI SL Owner’s Manual 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. -
Page 24: Code Of Ethics
TDI SL Owner’s Manual Treasure Hunter’s Code of Ethics 1. Always check federal, state, county, and local laws before searching. 2. Always obtain the owner’s permission before access- ing private property. 3. Take care to refill all holes and leave no trace.