Digital Control Z1920 ET, ST, LT, LT2 User Manual Operating Instructions

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Document Description	User Manual LT2
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Date Submitted	2010-09-27 00:00:00
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Document Title	Operating Instructions
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Document Author:	Kristie Hammond

Directional Drilling Locating System
Operator’s Manual
DIGITAL
CONTROL
INCORPORATED
DCI Headquarters
19625 62nd Ave. S., Suite B-103
Kent, Washington 98032 USA
Tel 425 251 0559 / 800 288 3610 Fax 253 395 2800
E-mail DCI@digital-control.com www.digitrak.com
DCI Europe
DCI India
DCI China
DCI Australia
DCI Russia
Kurmainzer Strasse 56
D-97836 Bischbrunn
Germany
Tel +49(0) 9394 990 990
Fax +49(0) 9394 990 999
DCI.Europe@digital-control.com
SCO # 259, Sector 44-C
Chandigarh (UT) 160 047
Punjab, India
Tel +91(0) 172 464 0444
Fax +91(0) 172 464 0999
DCI.India@digital-control.com
No. 41, Lane 500, Xingle Road
Minhang District
Shanghai P.R.C. 201107
Tel +86(0) 21 6432 5186
Fax +86(0) 21 6432 5187
DCI.China@digital-control.com
2/9 Frinton Street
Southport, Queensland 4215
Australia
Tel +61(0) 7 5531 4283
Fax +61(0) 7 5531 2617
DCI.Australia@digital-control.com
420059 Pavlyukhina Street
104, Kazan
Russia
Tel +7 843 277 52 22
Fax +7 843 277 52 07
DCI.Russia@digital-control.com
DIGITAL CONTROL INCORPORATED
3-1050-00-A
© 2008 by Digital Control Incorporated. All rights reserved. November 2008 edition.
Trademarks
The DCI logo, CableLink®, DataLog®, DigiTrak®, Eclipse®, iGPS®, Intuitive®, look-ahead®, SST®, target-inthe-box®, Target Steering®, and TensiTrak® are U.S. registered trademarks and DucTrak™, FasTrak™,
LT™, LT2™, SuperCell™, and TeleLock™ and are trademarks of Digital Control Incorporated.
Patents
The DigiTrak® LT2™ Locating System is covered by one or more of the following U.S. Patents:
5,337,002; 5,633,589; 5,764,062; 5,767,678; 5,878,824; 5,926,025; 5,933,008; 5,990,682; 6,002,258;
6,005,532; 6,008,651; 6,014,026; 6,035,951; 6,057,687; 6,160,401; 6,232,780; 6,396,275; 6,525,538;
6,559,646; 6,593,745; 6,693,429; 6,756,784; 6,838,881; 6,838,882; 6,924,645; 7,167,005. Sale of a
DigiTrak® LT2™ receiver does not convey a license under any patents covering the DigiTrak® transmitter
or underground drill housing. Other patents pending.
Limited Warranty
All products manufactured and sold by Digital Control Incorporated (DCI) are subject to the terms of a
Limited Warranty. A copy of the Limited Warranty is included with your DigiTrak® LT2™ Locating System;
it can also be obtained by contacting DCI Customer Service, 800-288-3610 or 425-251-0559, or by
connecting to DCI's web site, www.digitrak.com.
Important Notice
All statements, technical information, and recommendations related to the products of DCI are based on
information believed to be reliable, but the accuracy or completeness thereof is not warranted. Before
utilizing any DCI product, the user should determine the suitability of the product for its intended use. All
statements herein refer to DCI products as delivered by DCI and do not apply to any user customizations
not authorized by DCI nor to any third-party products. Nothing herein shall constitute any warranty by DCI
nor will anything herein be deemed to modify the terms of DCI’s existing limited warranty applicable to all
DCI products.
FCC Compliance Statement
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant
to Part 15 of the Rules of the Federal Communications Commission. These limits are designed to provide
reasonable protection against harmful interference in a horizontal directional drilling installation. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications or inaccurate
readings on your DCI locating equipment. However, there is no guarantee that interference will not occur
in a particular installation. If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on, the user is encouraged to try to
correct the interference by one or more of the following measures:




Reorient or relocate the DigiTrak® LT2™ Receiver.
Increase the separation between the problematic equipment and the DigiTrak® LT2™ Receiver.
Connect the equipment into an outlet on a different circuit.
Consult the dealer for help.
Changes or modifications to the DCI equipment not expressly approved and carried out by DCI will void
the user’s limited warranty and the FCC’s authorization to operate the equipment.
DigiTrak® LT2™ Operator’s Manual
DIGITAL CONTROL INCORPORATED
Table of Contents
SAFETY PRECAUTIONS AND WARNINGS................................................................................................ 5
DEAR CUSTOMER:...................................................................................................................................... 7
INTRODUCTION........................................................................................................................................... 9
RECEIVER .................................................................................................................................................. 11
General Description ............................................................................................................................... 11
Power On/Off ......................................................................................................................................... 12
Installing the Battery Pack ................................................................................................................ 12
Turning On the Receiver................................................................................................................... 13
Turning Off the Receiver................................................................................................................... 13
Automatic Shutoff ............................................................................................................................. 13
Main Display Screen .............................................................................................................................. 14
Standard Display Screen Symbols ........................................................................................................ 15
Proper Handling of Receiver.................................................................................................................. 16
Accessing and Changing Menu Settings ............................................................................................... 16
Receiver Display Menus ........................................................................................................................ 17
Height Above Ground ....................................................................................................................... 17
Power................................................................................................................................................ 21
Telemetry.......................................................................................................................................... 21
Backlight ........................................................................................................................................... 22
1-Pt Calibration ................................................................................................................................. 23
Depth Units ....................................................................................................................................... 25
Pitch Units......................................................................................................................................... 26
TRANSMITTER........................................................................................................................................... 27
Types of LT2 Transmitters ..................................................................................................................... 27
Transmitter Batteries.............................................................................................................................. 28
Transmitter Housing Requirements ....................................................................................................... 28
Transmitter Temperature ....................................................................................................................... 29
Sleep Mode (Automatic Shutoff)............................................................................................................ 31
General Transmitter Care Instructions................................................................................................... 31
REMOTE DISPLAY..................................................................................................................................... 33
General Description ............................................................................................................................... 33
Power On/Off ......................................................................................................................................... 34
Installing the Battery Pack ................................................................................................................ 34
Turning On the Remote Display ....................................................................................................... 34
Turning Off the Remote Display ....................................................................................................... 34
Automatic Shutoff ............................................................................................................................. 34
Main Display Screen .............................................................................................................................. 35
Remote Display Menus.......................................................................................................................... 36
Power Off.......................................................................................................................................... 36
Telemetry Channel Settings ............................................................................................................. 37
Backlight On/Off................................................................................................................................ 37
Hour Meter........................................................................................................................................ 38
DigiTrak® LT2™ Operator’s Manual
DIGITAL CONTROL INCORPORATED
Table of Contents (Continued)
BATTERY CHARGER................................................................................................................................. 39
General Description ............................................................................................................................... 39
AC/DC Power Setup .............................................................................................................................. 40
Charging a Battery ................................................................................................................................. 40
LOCATING INSTRUCTIONS...................................................................................................................... 43
Introduction ............................................................................................................................................ 43
Depth or Slant Distance ......................................................................................................................... 43
Locate Points (FLP & RLP) and Locate Line (LL) ................................................................................. 44
Effects of Depth, Pitch, and Topography on Distance Between FLP and RLP ..................................... 45
Marking Locate Points ........................................................................................................................... 46
Standard Method for Locating the Transmitter ...................................................................................... 47
Finding the FLP ................................................................................................................................ 48
Finding the Transmitter and the LL................................................................................................... 50
Finding the RLP to Confirm Transmitter Heading and Position........................................................ 51
Plus/Minus ("+/–") Method for Locating the Transmitter ........................................................................ 53
Finding the FLP ................................................................................................................................ 53
Finding the Transmitter and the LL................................................................................................... 54
Confirmation of Exact Heading and Transmitter Position................................................................. 55
Finding the RLP ................................................................................................................................ 55
Off-Track Locating ................................................................................................................................. 56
APPENDIX A: SYSTEM SPECIFICATIONS AND MAINTENANCE REQUIREMENTS ........................... 59
Power Requirements ............................................................................................................................. 59
Environmental Requirements ................................................................................................................ 59
Equipment Maintenance ........................................................................................................................ 59
APPENDIX B: PROJECTED DEPTH VERSUS ACTUAL DEPTH AND THE FORE/AFT OFFSET......... 61
APPENDIX C: CALCULATING DEPTH BASED ON DISTANCE BETWEEN FLP AND RLP .................. 67
LIMITED WARRANTY
DigiTrak® LT2™ Operator’s Manual
DIGITAL CONTROL INCORPORATED
Safety Precautions
and Warnings
IMPORTANT NOTE: All operators must read and understand the precautions and warnings given
below before using the DigiTrak® LT2™ Locating System.

Serious injury and death can result if underground drilling equipment makes contact with an
underground utility, such as a high-voltage electrical cable or a natural gas line.
 Substantial property damage and liability can result if underground drilling equipment makes
contact with an underground utility such as a telephone, cable TV, fiber-optic, water, or sewer
line.
 Work slowdown and cost overruns can occur if drilling operators do not use the drilling or
locating equipment correctly to obtain proper performance.

Directional drilling operators MUST at all times:

Understand the safe and proper operation of drilling and locating equipment, including the use of
ground mats and proper grounding procedures.

Ensure that all underground utilities have been located, exposed, and marked accurately prior to
drilling.

Wear protective safety clothing such as dielectric boots, gloves, hard-hats, high-visibility vests,
and safety glasses.

Locate and track the transmitter in the drill head accurately and correctly during drilling.

Comply with state and local governmental regulations (e.g., OSHA).

Follow all other safety procedures.

The LT2 system cannot be used to locate utilities.

Continued exposure to heat, due to frictional heating of the transmitter in the drill head, can cause
inaccurate information to be displayed and may permanently damage the transmitter. For more
information see “Types of LT2 Transmitters” in the Transmitter section.
 The LT2 equipment is not explosion-proof and should never be used near flammable or
explosive substances.
DigiTrak® LT2™ Operator’s Manual
DIGITAL CONTROL INCORPORATED
Safety Precautions
and Warnings (Continued)

Prior to the start of each drilling run, test the LT2 system with the transmitter inside the drill head to
confirm that it is operating properly and check that it is providing accurate drill head location and
heading information (see Receiver section) and accurate transmitter depth, pitch, and roll information.

During drilling, the depth will not be accurate unless:

The receiver has been properly calibrated and the calibration has been checked for accuracy so
that the receiver shows the correct depth.

The transmitter has been located correctly and accurately and the receiver is directly above the
transmitter in the drill head underground.

The receiver is kept level.

Always test calibration after you have stopped drilling for any length of time.

Interference can cause inaccuracies in the measurement of depth and the loss of the transmitter
pitch, roll, or heading. You should always perform an electrical interference check prior to drilling.

Sources of interference include but are not limited to traffic signal loops, invisible dog fences,
cable TV, power lines, fiber-trace lines, metal structures, cathodic protection, telephone lines, cell
phones, transmission towers, conductive earth, salt water, rebar, radio frequencies, and other unknown sources of interference.

Interference with the operation of the remote display may also occur from other sources operating
nearby on the same frequency, such as car rental agencies using their remote check-in modules,
other directional drilling locating equipment, etc.

Background noise must be minimal and signal strength must be at least 150 points above the background noise during all locating operations.

Carefully review this manual to ensure you know how to operate the LT2 system properly to obtain
accurate depth, pitch, roll, and locate points. If you have any questions about the operation of the
system, please call DCI’s Customer Service Department at any of the phone numbers provided on
the cover, and we will do our best to assist you.
DigiTrak® LT2™ Operator’s Manual
DIGITAL CONTROL INCORPORATED
Dear Customer:
We would like to thank you for choosing the DigiTrak LT2 Locating System. We are
proud of the equipment that we have been designing and building in Washington State
since 1990. We believe strongly in providing a unique, high-quality product and standing
behind it with superior customer service and training.
We ask that you take the time to read this entire manual—especially the section on
safety. Also, please fill out the warranty registration and mail it in or fax it to us at 253395-2800. We will put you on the Digital Control mailing list and send you product
upgrade information and our FasTrak™ newsletter.
We also ask that you feel free to contact us at the most convenient of our global offices
listed on the front cover if you are experiencing any problems with the equipment or
have any questions regarding its use. Our Customer Service Department is available 24
hours a day, 7 days a week to provide assistance.
As the horizontal directional drilling industry grows, we try to keep an eye on the future
to develop equipment that will make your job faster and easier. We encourage you to
stay current by visiting our web site on the Internet at www.digitrak.com or by giving us a
call at any of our offices worldwide.
We welcome questions, comments, and ideas.
Digital Control Incorporated
Kent, Washington
November 2008
DigiTrak® LT2™ Operator’s Manual
DIGITAL CONTROL INCORPORATED
Notes
DigiTrak® LT2™ Operator’s Manual
DIGITAL CONTROL INCORPORATED
Introduction
Receiver
Battery
Charger
Remote
Display
LT
Transmitter
Antenna for
Remote
LS2 Transmitter
Rechargeable
Battery Packs
DigiTrak LT2 Locating System
The DigiTrak LT2 Locating System is used to locate and track the transmitter in the drill head during
horizontal directional drilling (HDD) operations. The system consists of a handheld receiver, a transmitter
that is placed in the drill head, and a remote display that is located at the drill rig. The receiver and remote
are powered by a rechargeable battery pack, and a battery charger is also included with the system.
Locating is streamlined using the LT2 receiver’s graphic display and menu system. The real-time graphic
display guides you in positioning a target (or a line) in a box on the display window to locate the transmitter. You can also locate using the plus/minus signs, as on earlier DigiTrak models produced by Digital
Control Incorporated (DCI).
This manual provides information on each LT2 system component—the receiver, transmitter, remote display, and battery charger—in separate sections following this introduction. These sections are followed by
the Locating Instructions section, which explains important locating terms and gives step-by-step locating
instructions.
Supplemental information is provided in appendices. Appendix A presents the LT2 system’s power
requirements, environmental requirements, and equipment maintenance requirements. Appendix B
provides information regarding how to calculate the actual depth when the transmitter is deep (greater
than 15 ft or 4.5 m) and/or at a steep pitch (greater than ±30% or ±17°). Appendix C provides a method to
calculate the transmitter depth based on the distance between the front and rear locate points and the
pitch of the transmitter.
DigiTrak® LT2™ Operator’s Manual
Introduction
The LT2 system is programmed to comply with global operating requirements. The receiver’s global
designation number must match that of the transmitter for proper communication (see figure showing
startup screen under “General Description” in the Receiver section and “Types of LT2 Transmitters” in the
Transmitter section). Also, the receiver’s telemetry frequency designation must match that of the remote
display (see figure showing receiver back label in “General Description” in the Receiver section and
“General Description” in the Remote Display section).
10
DigiTrak® LT2™ Operator’s Manual
DIGITAL CONTROL INCORPORATED
Receiver
Handle
Display Screen
Front
Panel
Battery
Compartment
Trigger
Back
Label
DigiTrak LT2 Receiver (side view)
General Description
Display
Screen
The LT2 receiver is a handheld unit used for locating and
tracking an LT2 transmitter emitting a signal at 12 kHz. The
receiver converts signals from the transmitter and displays the
following information: depth, pitch, roll, and temperature of the
transmitter, and battery status of both the transmitter and the
receiver. The LT2 receiver also sends signals to the LT2
remote display at the drill rig.
The LT2 system can be used to take depth readings without
setting the receiver on the ground. The height-above-ground
function allows you to program a comfortable height for
holding the receiver for depth readings (see discussion under
“Receiver Display Menus” later in this section). Using the
height-above-ground feature also allows greater separation,
which can decrease the effects of interference.
The LT2 receiver is equipped with an internal speaker that
emits audible tones to accompany menu changes and
temperature warnings from the transmitter. Audible tones also
accompany the power-on sequence and the manual shutdown
sequence. The various warning tones are discussed further
where applicable in the following sections.
Battery
Compartment
DigiTrak LT2 Receiver (top view)
DigiTrak® LT2™ Operator’s Manual
11
Receiver
To meet global requirements and for proper communication; the frequency designation shown on the
receiver’s serial number label (see figure below) must match that shown on the remote display. To
determine the remote display’s frequency designation, see the figure showing the remote’s serial number
label in the “General Description” discussion in the Remote Display section.
Battery
Compartment
Cover
Thumb
Screws
Serial Number
Telemetry
Frequency
Designation
Back of Receiver Showing
Serial Number and Telemetry Frequency Designation
Power On/Off
Installing the Battery Pack
1. Remove the battery compartment cover from the back of the receiver by rotating the thumb screws
counterclockwise.
2. Insert a fully charged battery pack terminal end first with exposed terminals aligned with springs in
battery compartment.
3. Replace the battery compartment cover and tighten the thumb screws by rotating them clockwise.
The serial number label on the back of the receiver shows the telemetry frequency designation (see
above photo). This frequency designation must match the frequency designation on the remote display,
which is located on the serial number label on the back of the remote display (see “General Description”
in the Remote Display section).
12
DigiTrak® LT2™ Operator’s Manual
Receiver
Turning On the Receiver
To turn the LT2 receiver on, pull and hold the trigger in for 2 seconds and release. When the trigger is
engaged at startup, you will hear a short beep followed by a long tone. You will briefly see a series of
three screens at startup, before the default locating screen appears. The first startup screen shows all of
the display symbols illuminated. The second screen shows the firmware and software versions. The third
and final screen (shown in the following figure) displays the global designation number, which must match
that of the transmitter (see “Types of LT2 Transmitters” in the Transmitter section).
Global Designation
Number
Startup Screen Showing Global Designation Number
Turning Off the Receiver
To turn the unit off, you must first access the menu choices (see “Receiver Display Menus”). Click the
trigger until you reach the power menu
, then hold the trigger in during the countdown from 3 to 0 to
shut the receiver off; you will hear a beep each time the counter decreases followed by three short
confirmation beeps before the unit shuts off.
Note that when the receiver power is turned off, the height-above-ground function is also turned off. If you
want to use the height-above-ground function, you must turn it on and reset the value (if needed) after
you turn on the receiver.
Automatic Shutoff
The receiver will automatically shut itself off if no signal is received for 15 minutes.
As noted above, when the receiver power is turned off, the height-above-ground function is also turned
off. If you want to use the height-above-ground function, you must turn it on and reset the value (if
needed) after you turn on the receiver.
DigiTrak® LT2™ Operator’s Manual
13
Receiver
Main Display Screen
When the LT2 receiver is on, the display screen shows the standard locating mode display (see figure
below) as the default display. The display symbols that appear on the locating screen are identified in the
figure below and described in the “Standard Display Screen Symbols” table on the next page. Note that
the height-above-ground setting will only appear if the height-above-ground function is enabled.
HeightAboveGround
Setting
Transmitter
Roll (Clock)
Pitch/Roll
Update
Indicator
Target-in®
the-box
Locating
Display
Transmitter
Pitch
Distance to
Transmitter
Transmitter
Battery
Receiver
Battery
Transmitter
Temperature
Standard Locating Mode Display with Height-Above-Ground Function
Enabled (Left) and Without (Right)
When the operator holds in the trigger, the display changes to show the telemetry channel setting, signal
strength, and transmitter temperature (see figure below and table on next page).
Telemetry Channel
Setting Replaces
Height-AboveGround Setting
Transmitter
Temperature
Replaces Pitch
Reading
Signal Strength (with
+/– Locating Symbol)
Replaces Distance to
Transmitter
Standard Locating Mode Display with Trigger In
14
DigiTrak® LT2™ Operator’s Manual
Receiver
Standard Display Screen Symbols
Height-Above-Ground Icon – Appears above the ground symbol
the height-above-ground function is on and shows the current height setting.
when
Ground – Represents the surface of the ground.
Locating Icon – Represents a bird’s-eye view of the receiver. This icon is referred to as
the “box” when using the target-in-the-box and line-in-the-box locating techniques.
Target – Represents the front and rear locate points (FLP and RLP). When the receiver is
positioned directly above a locate point, the target will be in the box.
Line – Represents locate line (LL). When the receiver is positioned directly above the
LL, the line will be in the box. The LL also allows for off-track locating when access over
the drill head is limited.
Transmitter Battery – Depicts the battery status of the transmitter. This case shows five
of seven bars, which means there is 71% battery life remaining.
Transmitter Temperature – Shows temperature status of transmitter. An arrow appears
next to the thermometer pointing either up to indicate increasing temperature, or down to
indicate decreasing temperature. The three curved lines extending from the top of the
thermometer appear if the transmitter has reached a dangerous temperature of 118°F or
48°C and requires immediate attention. The thermometer will flash off and on at 140°F
(60°C) to further indicate the need for immediate action to cool the transmitter. The actual
temperature can be displayed in place of the pitch by holding the trigger in.
Receiver Battery – Depicts the battery status of the receiver. This case shows five of
seven bars, which means there is 71% battery life remaining.
Transmitter Pitch – Shows the inclination of the transmitter, displayed in either percent
slope or degrees. The pitch value is shown with a drill head indicator behind it that points
up for positive pitch and down for negative pitch. When using percent slope for pitch
measurements, a value from 0 to 100 will appear; when using degrees, a value from 0 to
45 will appear, followed by a decimal point and a value of 0 or 5. Pitch measurements are
given in 0.5-degree increments.
Pitch/Roll Update Indicator - The dot in the center of the clock should blink 2 times per
second, indicating that current pitch, roll, battery, and temperature information is being
received from the transmitter.
Transmitter Roll – The clock shows the 12 roll positions of the transmitter.
+/–
Telemetry Channel Setting – Shows the current channel setting for the receiver. The
receiver must be set to the same channel as the remote display. There are four channel
settings (1, 2, 3, 4) and an Off setting.
Plus/Minus Locating Indicator – The plus or minus sign in front of the signal strength
value can be used to guide the operator in finding the locate points (FLP and RLP) and
the locate line (LL).
Signal Strength – Displays the amount of signal from the transmitter when the trigger is
held in. The signal strength scale ranges from 0 to 999, where 0 indicates no signal and
999 indicates signal saturation (receiver and transmitter are very close). When the trigger
is not held in and the receiver is saturated (too close to transmitter), you will see four
dashed lines ( — — — — ) where the distance/depth number should display.
DigiTrak® LT2™ Operator’s Manual
15
Receiver
Proper Handling of Receiver
The receiver must always be held correctly to obtain
accurate readings. You must hold the receiver level
at all times and at a constant height above the
ground (see “Height Above Ground” menu discussion later in this section).
Level Receiver
Not Level Receiver
You can track the transmitter by holding the receiver while facing the drill or while facing away from the
drill (see figures below). Either way, the information on the receiver display will be the same when at the
same location. For an accurate depth reading, you must hold the receiver level and have it aligned with
and directly above the transmitter.
Receiver
Transmitter
Transmitter
Receiver
Drill
Receiver Facing Away from Drill
Drill
Receiver Facing Toward Drill
Accessing and Changing Menu Settings
To access the LT2 menu functions, you simply click the trigger. Each trigger click advances you to the
next menu item. When you stop at a menu, you will see a number that indicates a countdown sequence.
To change a menu setting, hold the trigger in while the counter goes down to 0; you will hear a beep
each time the counter decreases. Once the counter reaches 0, release the trigger and the menu setting
will be changed, which is indicated by a checkmark at the bottom of the screen () and a few short
confirmation beeps. If no trigger action is detected within 3 seconds, the display will return to the locating
mode screen.
16
DigiTrak® LT2™ Operator’s Manual
Receiver
Receiver Display Menus
The front label on the LT2 receiver shows the display menus (see figure below). This section describes
each menu function and gives instructions for how to change the menu settings. The menus are listed in
the order that they appear on the front label of the receiver, starting with the height-above-ground menu.
The locating mode is the standard default display that you will see when you turn on the receiver.
Receiver Display Menus as Shown on Front Label
HEIGHT ABOVE GROUND
This display menu allows you to enter a height-above-ground measurement so that you can measure the
transmitter depth without having to place the LT2 receiver on the ground. If the height-above-ground
function is not on, then you must place the receiver on the ground to take depth measurements.
The height-above-ground value can be set from a distance of 100 up to 300 using FTIN depth units (feet
and inches); from 12 up to 36 using “in” depth units (or inches only); or from 030 up to 090 using MCM depth
units (meters and centimeters)—see discussion of depth units menu later in this section.
DigiTrak® LT2™ Operator’s Manual
17
Receiver
The default height-above-ground distances for the three depth options are
100 for 1 ft 0 in.; “12 in” for 12 inches; or 030 for 0 m 30 cm. When using the
“Set” option described below, the units of measure will increase by 1-in.
increments if you are using English units and by 2-cm increments if using
metric units.
The height-above-ground function can also be helpful when the depth of
the transmitter is shallower than 24 in. (61 cm). If the receiver is placed on
the ground in this situation, it will be saturated with signal and you will not
see a depth number. Instead you will see four dashed lines ( — — — — )
where the distance/depth number should display. In cases like this, you can
use the height-above-ground function to increase the distance between the
receiver and the transmitter so that the signal does not saturate the
receiver.
Height
Above
Ground
Transmitter
Depth
When the height-above-ground function is enabled, you will see the heightabove-ground value on your locating screen, as shown in the following
figure. You must hold the receiver at this height to get accurate depth
measurements.
Height-AboveGround Setting
Distance to
Transmitter
Locating Mode Display with 1-ft 9-in. Height Above Ground
NOTE: When you turn off the receiver, calibrate, or change the depth units, the height-aboveground function automatically turns off. The current height-above-ground setting reverts to
the default value if you change the depth units between English and metric.
There are three options in the height-above-ground menu:



18
“On” turns on the height-above-ground function.
“Off” turns off the height-above-ground function.
“Set” allows you to set (change) the height-above-ground value.
DigiTrak® LT2™ Operator’s Manual
Receiver
To turn on the height-above-ground function:
1. From the locating screen, click the trigger once to advance to the height-above-ground menu. You will
see the “On” option displayed as the first setting option. You will also see the last height-aboveground number that was entered or the default value. If you want that number to remain the same,
follow these instructions to turn on the height-above-ground function. If you want to change this
number, you must follow the instructions to set (change) the height-above-ground value, described
later in this section.
Height-Above-Ground “On” Screen
2. Hold the trigger in through the countdown/beep sequence from 2 to 0.
3. Release the trigger when the 0 is displayed, and a checkmark will briefly appear at the bottom of the
display accompanied by three short confirmation beeps indicating this option has been selected. You
have now turned on the height-above-ground function to the value displayed.
4. Release the trigger, and the display will return to the locating screen.
To turn off the height-above-ground function:
1. From the locating screen, click the trigger to advance to the height-above-ground menu. You will see
the “On” option displayed.
2. Continue to hold the trigger in through the countdown/beep sequence from 2 to 0, and you will then
see the “Off” option displayed.
Height-Above-Ground “Off” Screen
DigiTrak® LT2™ Operator’s Manual
19
Receiver
3. Continue to hold the trigger in through the countdown/beep sequence from 2 to 0.
4. Release the trigger when the 0 is displayed, and a checkmark will briefly appear at the bottom of the
display accompanied by three short confirmation beeps indicating this option has been selected. The
height-above-ground function has now been turned off, and the display will return to the locating
screen. With the height-above-ground function off, you must place the receiver on the ground for accurate depth readings.
To set or change the height-above-ground measurement:
1. Hold the LT2 receiver at the height which you intend to hold the receiver.
2. Using a measuring tape, measure the distance from the bottom of the receiver to the ground. This is
your desired height-above-ground measurement.
3. From the locating screen, click the trigger to advance to the height-above-ground menu. You will see
the “On” option displayed.
4. Continue to hold the trigger in through the countdown/beep sequence from 2 to 0, and you will then
see the “Off” option displayed.
5. Continue to hold the trigger in through the countdown/beep sequence from 2 to 0, and you will see
the “Set” option displayed.
Height-Above-Ground “Set” Screen
6. Continue to hold the trigger in through the countdown/beep sequence from 2 to 0.
7. Continue to hold the trigger in, and the height-above-ground measurement will display starting at 12
in. (30 cm) and then counting up in 1-inch (2-cm) increments.
8. Once you see the desired height, according to the measurement you made in step 2, release the
trigger, and a checkmark will appear at the bottom of the display accompanied by three short confirmation beeps indicating you have reset the height-above-ground value. The display will then automatically return to the locating screen with the height-above-ground function on.
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DigiTrak® LT2™ Operator’s Manual
Receiver
POWER
This display menu allows you to turn off the receiver.
1. Click the trigger to advance to the power menu.
2. Hold the trigger in through the countdown/beep sequence from 3 to 0.
Power Off Screen
3. When the counter reaches 0, you will see a checkmark at the bottom of the display accompanied by
four short confirmation beeps.
4. Release the trigger and the unit will shut off.
TELEMETRY
This display menu allows you to change the telemetry channel setting. This is the channel that the
receiver uses to communicate with the remote display. The receiver and the remote display must be set
to the same channel. There are four different telemetry channels (1, 2, 3, 4).
1. Click the trigger to advance to the telemetry menu, where the current channel setting is displayed.
2. Hold the trigger in through the countdown/beep sequence from 1 to 0.
Telemetry Channel Setting
DigiTrak® LT2™ Operator’s Manual
21
Receiver
3. When the counter reaches 0, you will see a checkmark at the bottom of the display accompanied by
four short confirmation beeps.
4. While still holding the trigger in, the channel setting will cycle through all five settings—Off, 1, 2, 3, 4.
You will hear four short beeps each time the setting changes.
5. Release the trigger when the correct setting is displayed, and the display will then automatically
return to the locating screen. To confirm, hold in the trigger for 2 seconds or more to display the
channel setting.
BACKLIGHT
This display menu allows you to turn on or off the display backlight.
1. Click the trigger to advance to the backlight menu; a light bulb will appear on the display. If the
backlight is on, the bulb will be lit up; if it is off, the bulb will appear unlit.
2. Hold the trigger in through the countdown/beep sequence from 2 to 0.
Backlight Is Turned Off
Backlight Is Turned On
3. Release the trigger when the counter reaches 0. The light bulb will either light up as the backlight
comes on or become unlit as the backlight turns off, and you will hear four short confirmation beeps
before the display automatically returns to the locating screen.
NOTE: The backlight automatically comes on for a few seconds at startup, and then it defaults to
the off setting, even if you have set it previously.
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DigiTrak® LT2™ Operator’s Manual
Receiver
1-PT CALIBRATION
This display menu allows you to calibrate the receiver using the 1-point calibration procedure. The 1-point
calibration procedure is performed with the transmitter in the housing, as described later in this section.
DCI recommends that you verify that the receiver’s depth readings are accurate at several locations using
a tape measure before you drill. Calibration is necessary prior to first-time use and whenever a different
transmitter, receiver, or housing is going to be used.
Do not calibrate if:





You are within 10 ft (3 m) of metal structures, such as steel pipe, chain-link fence, metal siding,
construction equipment, or automobiles.
The receiver is over rebar or underground utilities.
The receiver is in the vicinity of excessive electrical interference.
The transmitter is not installed in the housing.
The transmitter is not turned on.
NOTE: Calibration is necessary prior to first-time use and whenever a different transmitter, receiver, or housing is going to be used.
The 1-point calibration menu display appears as follows:
1-Point Calibration Screen
To calibrate the receiver:
1. Using a tape measure, place the receiver on the ground parallel to and level with the transmitter
(powered on and in housing) so that the distance from the centerline of the transmitter to the inside
edge of the receiver is 10 ft (3.05 m), as shown in the figure given below.
DigiTrak® LT2™ Operator’s Manual
23
Receiver
10 ft (3.05 m)
Transmitter
in Housing
LT2 Receiver
(top view)
Transmitter
Centerline
Setup for 1-Point Calibration
2. Hold the trigger in on the receiver, and verify that roll and pitch readings are present and that the
signal strength is stable. Then, click the trigger to advance to the 1-point calibration screen.
3. Hold the trigger in while holding the receiver steady through the countdown/beep sequence from 5
to 0.
4. Release the trigger when the counter reaches 0. You will see a checkmark at the bottom of the
display accompanied by three confirmation beeps indicating a successful calibration. If you see a
checkmark with a slash through it ( ) and hear a short beep followed by two long tones, then the
calibration has failed, and you must repeat steps 2 through 4. The error screen will display for approximately 30 seconds before returning to the locating screen.
5. After you have successfully calibrated the receiver, the display will automatically return to the locating
screen. You must now verify the calibration by checking depth readings at three locations.
6. To verify calibration, place the receiver on the ground parallel to and level with the transmitter so that
the distance from the centerline of the transmitter to the inside edge of the receiver measures a given
amount on the tape measure; in the example shown in the figure below, a distance of 6 ft (1.83 m) is
used.
Transmitter
in Housing
6 ft (1.83 m)
LT2 Receiver
(top view)
Transmitter
Centerline
Verifying Calibration
7. You should see a depth reading that matches this measured distance, which in our example would be
6 ft (1.83 m).*
8. Repeat the above two steps in at least two more locations.
*Depth tolerance is 5%; thus, at a distance of 6 ft (1.83 m), the error tolerance is 3.6 in. (9 cm).
24
DigiTrak® LT2™ Operator’s Manual
Receiver
DEPTH UNITS
This display menu allows you to set the LT2 system to display values (depth and temperature) in either
English units (FTIN or “in” and °F) or metric units (MCM and °C).
1. Click the trigger to advance to the depth units menu. The display will indicate the current setting.
2. Hold the trigger in through the countdown/beep sequence from 3 to 0.
Depth Units Display Menu
3. When the counter reaches 0, you will see the unit setting change and a checkmark appear at the bottom of the display accompanied by four confirmation beeps. If the desired units are not displayed
after the check mark appears, continue to hold the trigger in through the next count down sequence.
4. Release the trigger when the desired units are displayed. The display will then automatically return to
the locating screen.
NOTE: If you change the depth units between English and metric, the height-above-ground
setting will revert to the default value.
DigiTrak® LT2™ Operator’s Manual
25
Receiver
PITCH UNITS
This display menu allows you to set the LT2 system to display pitch values in either degrees or percent of
slope.
1. Click the trigger to advance to the pitch units menu. The display will indicate the current setting.
2. Hold the trigger in through the countdown/beep sequence from 3 to 0.
Pitch Units Display Menu
3. When the counter reaches 0, you will see the unit setting change and a checkmark appear at the bottom of the display accompanied by four confirmation beeps.
4. Release the trigger, and the display will automatically return to the locating screen.
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DigiTrak® LT2™ Operator’s Manual
DIGITAL CONTROL INCORPORATED
Transmitter
Types of LT2 Transmitters
DCI manufactures two different battery-operated transmitters for use with the LT2 system—the standardrange LT transmitter (bright-green tube) and the short-range LS2 transmitter (brown tube). The transmitter
fits inside the drill housing and transmits information regarding the drill head location, position, and
heading. An index slot at the front end assists in properly aligning the transmitter in the housing. The
transmitter emits electromagnetic signals at a frequency of 12 kHz that the LT2 receiver “hears” and
converts into the information shown on the receiver and remote display screens.
The transmitter and receiver must both have matching global designation numbers to ensure that they
comply with regional operating requirements. The global designation number is located near the serial
number on the transmitter’s battery compartment, as shown by the number inside the globe icon ( ) in
the photo below. This number must match that of your receiver for proper communication. To determine
your receiver’s global designation number, see the startup screen shown under “Turning On the
Receiver” in the Receiver section.
The standard-range LT transmitter provides a depth range of 40 ft (12.2 m) and is 15.00 in. (381.0 mm)
long and 1.25 in. (31.8 mm) in diameter. It is powered by two C-cell alkaline batteries or one DCI
SuperCell lithium battery.
Front End Cap
with Index Slot
Battery Cap End
Serial Number
Global Designation Number
Standard-Range LT Transmitter
The short-range LS2 transmitter provides a depth range of approximately 15 ft (4.6 m) and is 8.00 in. (203
mm) long and 1.00 in. (254 mm) in diameter. It is powered by one AA alkaline battery.
Short-Range LS2 Transmitter
DigiTrak® LT2™ Operator’s Manual
27
Transmitter
NOTE: The range of any transmitter with any DCI receiver is largely dependent upon the amount
of interference at a job site. The range decreases as interference increases.
Transmitter Batteries
The standard-range LT transmitter is powered by two C-cell alkaline
batteries or one DCI SuperCell lithium battery, and the short-range
LS2 transmitter is powered by one AA alkaline battery.
Transmitter Battery Status
Display Symbol
To install batteries into the transmitter, remove the battery cap by
rotating it counterclockwise using a tool such as a large flat screwdriver inserted in the notch in the
battery cap. Insert the batteries positive terminal first, and replace the battery cap ensuring the cap
bottoms out for proper seal.
The transmitter battery symbol at the bottom of the display screen continuously shows the status of the
transmitter battery power using progress bars that decrease as the battery power is used. The battery is
fully charged when it shows seven bars.
Transmitter Housing Requirements
To achieve maximum range and battery life for all of DCI’s transmitters, the slots in the drill housing must
be long enough and correctly positioned. Slot measurements should always be taken from the inside of
the housing. DCI recommends at least three slots equally spaced around the circumference of the
housing. The slots should be at least 1/16 or 0.0625 in. (1.6 mm) wide.
For the standard-range LT transmitter (15.00 in./381 mm long), each slot should begin at least 2.0 in. (51
mm) and not more than 3 in. (76 mm) from the front of the transmitter and must be at least 8.5 in. (216
mm) long (see figure below).
Front
End
Slot Position
Back
End
8.5 in.
216 mm
2.0 in.
51 mm
LT Transmitter Housing Slot Requirements
28
DigiTrak® LT2™ Operator’s Manual
Transmitter
For the short-range LS2 transmitter (8.00 in./203 mm long), each slot should begin at least 1.25 in. (32
mm) and not more than 2 in. (51 mm)from the front of the transmitter and must be at least 3.75 in. (95
mm) long (see figure below).
Front
End
Slot Position
Back
End
3.75 in.
95 mm
1.25 in.
32 mm
LS2 Transmitter Housing Slot Requirements
Transmitter Temperature
The transmitter temperature symbol at the bottom of the display
gives an indication of the temperature, with progress bars and an
up or down arrow. An up arrow accompanied by a beep indicates
Transmitter Temperature
the temperature is increasing; a down arrow indicates the temperaDisplay Symbol
ture is decreasing. A digital temperature reading can be viewed
below the clock in place of the pitch by holding in the trigger. The
drill rig operator can view the transmitter temperature by holding in the function button on the remote
display. Drilling should be suspended when temperatures reach 95°F (35°C) to permit cooling.
Receiver Display Screen Showing
Transmitter Temperature
DigiTrak® LT2™ Operator’s Manual
Remote Display Screen Showing
Transmitter Temperature
29
Transmitter
If the transmitter reaches 118°F (48°C), the receiver will emit warning tones at regular intervals (see table below), and the transmitter
temperature symbol will change to indicate the transmitter has
reached a dangerous temperature—three curved lines will be seen
extending from the top of the thermometer, and the thermometer
symbol will appear full, as shown in the figure to the right. When the
transmitter temperature reaches 140°F (60°C), the thermometer
symbol will flash and the beeps from the receiver will become more
rapid (see table below).
Dangerous Transmitter
Temperature Indicator
The warning tones that will be emitted due to transmitter temperature overheat are summarized in the
following table. Warning tones will occur for every 7°F (4°C) increase in temperature unless otherwise
noted in this table.
Transmitter Temperature Warning Tones
Temperature
Warning Tones
Below 90°F (32°C)
Double-beep sequence (beep-beep)
From 96°F–111°F (36°C–44°C)
Two double-beep sequences (beep-beep, beep-beep)
From 118°F–133°F (48°C–56°C)
Three double-beep sequences (beep-beep, beep-beep, beep-beep)
From 140°F–169°F (60°C–76°C)
Three double-beep sequences every 5 seconds
Above 169°F (76°C)
Continuous triple-beeps; transmitter shuts down above 176°F (80°C)
The transmitter also has a temperature overheat indicator (temp dot) that has an outer yellow ring with a
1/8-inch (3-mm) white dot in the center. This temp dot is located on the stainless-steel front end cap. The
temp dot should be white if the transmitter has not been exposed to excessive heat. If the temp dot is
silver or gray, it indicates the transmitter has been exposed to heat but not in excess of the specifications.
A black temp dot indicates the transmitter has been exposed to temperatures in excess of 220°F (104°C)
for an LT transmitter and in excess of 180°F (82°C) for an LS2 transmitter.
Black
Temp Dot
(Overheated)
Temp Dot
Index Slot at
6 o’clock Position
Front End Cap of Transmitter Showing Temp Dot, Index Slot, and Black Temp Dot
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DigiTrak® LT2™ Operator’s Manual
Transmitter
If the temp dot is black, the transmitter should be considered unreliable. If the transmitter overheats, it
may appear to operate normally; however, exposure to excessive temperatures greatly increases the likelihood of inaccurate information and will contribute to premature failure of the transmitter. The DCI warranty does not apply to any transmitter that has been overheated or that has had its temp dot removed.
Avoid transmitter overheating by practicing proper drilling techniques. Abrasive soils, clogged jets, inadequate mud flow, and poorly mixed mud are some of the factors that can contribute significantly to the
risk of an overheated transmitter.
Sleep Mode (Automatic Shutoff)
LT2 transmitters will shut down (go into “sleep” mode) to conserve battery power if they are stationary for
15 minutes. To “wake up” the transmitter, simply rotate the drill string.
General Transmitter Care Instructions

Clean the springs in the battery compartment and the threads of the battery cap and O-ring to
provide proper signal return and watertight seal for the batteries. Emery cloth can also be used to
remove any oxidation buildup.

Verify that the transmitter fits snugly in the housing. It may be necessary to wrap the transmitter
with tape or O-rings.

Send in the Product Registration card for the 90-day limited warranty.
DigiTrak® LT2™ Operator’s Manual
31
Transmitter
Notes
32
DigiTrak® LT2™ Operator’s Manual
DIGITAL CONTROL INCORPORATED
Remote Display
Antenna
Speaker
Thumb Screw
Function
Button
Mounting
Bracket
Battery
Compartment
Display Window
Thumb Screw
DigiTrak LT2 Remote Display
General Description
The DigiTrak LT2 remote display, which is located at the drill rig, receives signals from the LT2 receiver
and displays that information on the remote display window. The remote comes with an antenna that
must be attached before drilling. The speaker to the left of the display window emits audible tones to
accompany menu changes and to warn the operator if the transmitter temperature is increasing.
To meet global requirements and for proper communication; the frequency designation shown on the
remote display’s serial number label (see figure below) must match that shown on the receiver. To
determine the receiver’s frequency designation, see the figure showing the receiver back label in the
“Turning On the Receiver” discussion in the Receiver section.
Serial Number
Telemetry Frequency
Designation
Back of Remote Display Showing
Serial Number and Telemetry Frequency Designation
DigiTrak® LT2™ Operator’s Manual
33
Remote Display
The remote display has a main display screen and four menu options (power off, telemetry channel
settings, backlight on/off, and hour meter). The power on/off functions, including instructions for installing
the battery, the main display screen, and the remote display menu options are explained in this section.
Power On/Off
Installing the Battery Pack
1. Remove the battery compartment cover from the side of the remote display by rotating the thumb
screws counterclockwise.
2. Insert a fully charged battery pack terminal end first with exposed terminals aligned with springs in
battery compartment.
3. Replace the battery compartment cover and tighten the thumb screws by rotating them clockwise.
Turning On the Remote Display
The function button on the remote works similarly to the trigger on the receiver. To turn the LT2 remote
on, press or click the function button. You will hear a long tone followed by a set of numbers that
represent the firmware versions in the remote display.
Turning Off the Remote Display
To turn the remote off, you must first access the power off menu (see “Remote Display Menus”). Press or
click the function button to reach the power off menu, then hold the button in during the countdown from 3
to 0 to shut the remote off; you will hear a beep each time the counter decreases followed by three short
confirmation beeps before the unit shuts off.
Automatic Shutoff
The remote display will automatically shut itself off without an audible indicator if no data is received for
15 minutes.
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DigiTrak® LT2™ Operator’s Manual
Remote Display
Main Display Screen
The main remote display screen shows information sent from the receiver in a format very similar to the
display on the receiver. However, the battery status symbol displays the status of the remote display
battery rather than that of the receiver, as shown in the following drawing.
Height-AboveGround Setting
Roll/Pitch Indicator
(should be flashing)
Speaker
Function
Button
Remote Display
Battery Status
Distance to
Transmitter
Main Remote Display Screen
The main display screen indicates when the receiver is over the transmitter or the locate line (LL) by
showing arrows above and below the depth value, as shown in the following figure. The receiver display
will show the line in the box.
Arrow pointing to tool
head indicates the line
is in the box and the
receiver is above the
transmitter or the LL.
Depth Reading When Receiver Is Above Transmitter or LL
In this display, the downward arrow is pointing to the transmitter to indicate that the reading is the actual
depth of the transmitter or LL. If there is not an arrow pointing down from the depth reading, then the
depth value shown indicates the slant distance (see Locating Instructions section).
NOTE:
If you see four dashed lines ( — — — — ) where the distance/depth number should display,
then the receiver is too close to the transmitter and it is getting saturated with signal (see
“Height Above Ground” menu discussion in the Receiver section).
DigiTrak® LT2™ Operator’s Manual
35
Remote Display
By holding in the function button for 2 seconds or more, the transmitter temperature will display in place of
the pitch information and the telemetry channel will display in place of the height-above-ground setting, as
shown in the following figure.
Telemetry Channel Replaces
Height-Above-Ground Setting
Transmitter Temperature
Replaces Pitch Reading
Function Button Held In
Remote Display Menus
To access the remote display menus, click or press the function button. Each click advances you to the
next menu item. The function button on the remote works in the same manner as the trigger on the
receiver (see “Accessing and Changing Menu Settings” in the Receiver section).
Power Off
Click the button once to display the power off menu, as shown in the following picture. Hold the button in
for the countdown sequence from 3 to 0 to turn the unit off. Three short confirmation beeps will be heard
as the unit shuts down. The remote display will automatically shut itself off without an audible indicator if
no data is received for 15 minutes.
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DigiTrak® LT2™ Operator’s Manual
Remote Display
Telemetry Channel Settings
The telemetry channel menu allows you to change the telemetry channel setting and is accessed by
clicking the button twice. With the telemetry channel menu displayed, as shown in the following picture,
hold the button in to cycle through the four channel options (1, 2, 3, 4), and release when the desired
setting is selected. You will hear three short confirmation beeps and see the channel number change on
the display.
Backlight On/Off
The backlight on/off menu option is accessed by clicking the button three times. At the backlight on/off
menu option, shown in the following picture, hold the function button in to turn the display backlight on or
off. The remote will emit a beep with the countdown sequence followed by three short confirmation beeps
when the menu item is successfully changed.
DigiTrak® LT2™ Operator’s Manual
37
Remote Display
Hour Meter
The hour meter menu option displays the amount of time that the remote display unit has been running
(turned on) and is accessed by clicking the button four times. In the following picture, the hour meter
shows that the remote display unit has been running for 2,145 hours, 35 minutes, and 12 seconds. Click
the function button once to exit the hour meter and return to the main information screen.
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DigiTrak® LT2™ Operator’s Manual
DIGITAL CONTROL INCORPORATED
Battery Charger
Rechargeable
Battery Pack
Unexposed Terminal
DO NOT EXPOSE
Control Panel
AC Adapter
AC Power
Cord
DC Power
Cord
Negative
Terminal
Positive
Terminal
Battery Charger
General Description
The DCI battery charger unit, which includes AC and DC power cords and an AC adapter, is provided
with the LT2 system, along with three rechargeable DCI battery packs. The battery packs are used to
power the LT2 receiver and the remote display.
The battery charger can operate from AC (100–240 V) or DC (12–28 V) power sources. The battery
charger has specific cords for AC or DC power sources, as shown in the photo above. The AC power
cord is also specific to your global geographic area of operation.
A fully charged battery pack measures between 16.5 V and 17.1 V and will power an LT2 receiver for
approximately 8 hours or an LT2 remote display for approximately 12 hours before recharging is required.
A battery is considered discharged at 14.4 V.
Only two terminals are exposed on a battery pack (as shown in above photo). If the third terminal
becomes exposed or the insulating material over the battery shows signs of damage, the battery pack
must be replaced through an authorized dealer.
Charging or using damaged or non-DCI battery packs may damage the charger, the receiver, or the
remote display, and will void the warranty.
DigiTrak® LT2™ Operator’s Manual
39
Battery Charger
AC/DC Power Setup
To install either the AC adapter or the DC power cord,
insert the charger plug into the power port on the back
of the battery charger (see photo to right) and rotate a
quarter turn in either direction to lock it in place.
If using AC power, connect the AC power cord to the
power adapter, then plug the cord into the AC power
receptacle (wall outlet).
If using DC power, plug the DC power cord directly into
the DC power receptacle.
Your battery charger is now ready to use.
Inserting Charger Plug into Power Port
Charging a Battery
1. With power supplied to the battery charger, place a battery pack into the charger with the terminal
end making contact with the springs in the battery charger. The red light will illuminate, indicating that
the battery is charging. However, the battery may require discharging to remove any residual charge
and prolong the battery life; DCI recommends that you discharge a battery pack, as instructed in step
2, at least once a month.
Red Light:
– Solid indicates unit
is charging.
– Blinking indicates
low-voltage battery
or power interruption.
Green Light:
– Solid indicates
battery is fully
charged.
– Blinking indicates
battery is being
discharged.
Discharge Button
Charge Button
Serial Number
Battery Charger Control Panel
40
DigiTrak® LT2™ Operator’s Manual
Battery Charger
NOTE: If a battery becomes drained below 4 V, the charger will not immediately recognize the
battery. Leave the battery in the charger and press the charge button. Within a few
minutes, the red light will begin to blink indicating the charger has recognized the
battery. The red light will illuminate solidly within 30 seconds to 1 minute indicating
that the battery is charging on a full cycle.
2. If the battery needs discharging, press the discharge button on the battery charger; the green light will
begin to blink indicating the battery is being discharged. When the battery is completely discharged,
the green light will stop blinking and the charge cycle will automatically start, as indicated by the solid
red light.
NOTE: The discharge cycle may last for up to 4 hours depending on the amount of residual
charge in the battery. Typically, discharging will last for just a few minutes if the LT2
receiver or remote has indicated low battery voltage.
3. When the charging cycle is complete, the green light will automatically illuminate indicating that the
battery is charged and ready for use. The battery may take up to 4 hours to charge. The voltage on a
fully charged battery is between 16.5 V and 17.1 V.
NOTE:
If a battery is left in the charger during a power interruption, the red or green light may
flash and the battery will begin to discharge on its own. After the power has resumed,
simply remove and replace the battery pack.
DigiTrak® LT2™ Operator’s Manual
41
Battery Charger
Notes
42
DigiTrak® LT2™ Operator’s Manual
DIGITAL CONTROL INCORPORATED
Locating Instructions
Introduction
The DigiTrak LT2 Locating System is easy to use, but there are basic principles that must be understood
before you begin to operate the system. This section gives important information regarding the depth or
slant distance; the locate points and locate line; the geometry of these elements with respect to the
transmitter; and the proper method for marking locate points once they are found. It then describes the
standard locating procedure and an alternate technique referred to as the plus/minus method. The last
section discusses tracking the transmitter when you cannot walk over it, which is called off-track locating.
For a detailed explanation of how to track the transmitter when it is steep and deep, please read the
information provided in Appendix B: Projected Versus Actual Depth and Fore/Aft Offset.
Depth or Slant Distance
When the receiver is held directly above the transmitter, the distance to the transmitter is referred to as
the depth. At any other location, the distance is referred to as the slant distance. When the depth is displayed, there will always be arrows pointing up and down from the depth reading. If the arrows are not
displayed, then the reading is actually the slant distance.
Arrow pointing to tool
head indicates the
line is in the box and
the receiver is above
the transmitter or LL.
Line in the Box
Target Moving Toward the Box
Arrows indicate reading is actual depth.
No arrows indicate reading is slant distance.
NOTE:
If the transmitter is shallower than approximately 24 in. (61 cm) you will see four dashed
lines ( — — — — ) where the depth should display. This means that the receiver is too
close to the transmitter and it is getting saturated with signal (see “Height Above Ground”
menu discussion in the Receiver section).
DigiTrak® LT2™ Operator’s Manual
43
Locating
Locate Points (FLP & RLP) and Locate Line (LL)
Two of the three locations used for locating are points that represent extensions of the transmitter. One
point is in front of the transmitter (the front locate point or FLP), and the other is behind the transmitter
(the rear locate point or RLP). The third location is a line that represents the position of the transmitter.
This line, referred to as the locate line or LL, is perpendicular to the transmitter at 0% slope.
Bird's Eye View
(Looking Down)
LL
Drill
Axis Line
RLP
FLP
Transmitter
Side View
LL
Surface of
Ground
Drill
RLP
FLP
Transmitter
Geometry of FLP, RLP, and LL from Top and Side Views
Note how the RLP and FLP are equal distances from the LL when the transmitter is level.
NOTE:
44
If the transmitter pitch exceeds ±30% (or 17°) and/or the transmitter depth exceeds 15 ft
(4.5 m), the position of the locate line will be somewhat ahead of or behind the transmitter’s actual position; the depth displayed on the receiver is referred to as the projected
depth. Refer to Appendix B: Projected Versus Actual Depth and Fore/Aft Offset, for
information regarding this situation.
DigiTrak® LT2™ Operator’s Manual
Locating
Effects of Depth, Pitch, and Topography on Distance
Between FLP and RLP
Because of the transmitter’s field shape, the deeper the transmitter is, the further apart the FLP and RLP
will be. The distance between the FLP and RLP with respect to the location of the LL is also a function of
the transmitter pitch and the topography. (For more information on these topics, please see Appendix B:
Projected Versus Actual Depth and Fore/Aft Offset.)
When the transmitter pitch is negative, the FLP will be further from the LL than the RLP (see figure
below). When the transmitter pitch is positive, the RLP will be further from the LL than the FLP. If the
ground surface or topography slopes significantly, the locations of the FLP and RLP will also be affected
with respect to the LL even though the transmitter itself is level.
Bird's Eye View
(Looking Down)
LL
Drill
Axis Line
RLP
FLP
Transmitter (Negative
or Downward Pitch)
Side View
LL
Surface of
Ground
Drill
RLP
FLP
Transmitter (Negative
or Downward Pitch)
Effect of Pitch on Distance Between FLP, RLP, and LL
Note how the RLP and FLP are at different distances from the LL when the transmitter is at
a negative pitch (compare with figure on previous page in which transmitter is level).
It is possible to calculate depth (as a comparison to the receiver’s depth reading) using the distance
between the locate points and pitch. For additional information, please see Appendix C: Calculating
Depth Based on Distance Between FLP and RLP.
It is also possible to track the locate line when walk-over locating is not feasible, such as when surface
obstructions or interference occur. For more information about this feature, called off-track locating, see
“Off-Track Locating” at the end of the Locating section.
DigiTrak® LT2™ Operator’s Manual
45
Locating
Marking Locate Points
The front and rear locate points (FLP and RLP) and the locate line (LL) must be found and accurately
marked during the locating procedure. To mark a locate position after you have found it, stand with the
receiver level directly above the locate point. Look down the vertical axis that runs through the center of
the display to project a plumb line to the ground. The point where this plumb line hits the ground is the
location that you should mark.
Plumb Line or
Vertical Axis
Center of
Display
Front of
Receiver
Place Marker
Straight Down
on Ground
Plumb Line for Marking Locate Points
HANDLING THE RECEIVER
NOTE:
46
It is critical that you hold the receiver correctly to obtain accurate readings. You must hold the
receiver level at all times and maintain a constant height-above-ground distance that
matches the value it has been set to (see “Height Above Ground” menu discussion in the
Receiver section).
DigiTrak® LT2™ Operator’s Manual
Locating
Standard Method for Locating the Transmitter
With the LT2 system, you can locate the transmitter and its heading while it moves, whether standing in
front of it, behind it, or toward the side. You can also locate the transmitter facing either toward or away
from the drill rig.
The standard method described in this section guides you to the transmitter while standing out in front of
it, facing the drill rig. This is the recommended method for locating. As you continue to drill or as the bore
path curves, you may be facing the last marked locate point rather than the drill rig.
Move
Forward
Move
Forward
FLP
FLP
LL
LL
RLP
RLP
Drill
Setup for Standard Locating Method
Drill
Standard Locating Method
with a Curved Path
It is not necessary to hold the trigger in to view the depth/slant distance when using the standard method.
If you want to view the signal strength (with its associated plus/minus symbols) while locating, please
refer to the next subsection entitled “Plus/Minus ("+/–") Method for Locating the Transmitter.”
DigiTrak® LT2™ Operator’s Manual
47
Locating
Finding the FLP
The first position to find is the front locate point or FLP. The FLP gives you the transmitter heading. The
FLP’s distance ahead of the transmitter is dependent upon the transmitter depth and pitch; the deeper it
is, the further in front the FLP will be. The FLP is represented as a target (
) on the receiver display.
Target in Top Left Corner
1. Stand out in front of the drill head (facing the drill) at a distance of approximately one drill rod length.
2. As you approach the FLP, the target appears in the top left corner of the display and the depth
number decreases.
3. Continue to walk forward until the target moves into the locating icon (box). You have found the
fore/aft position of the FLP; the next step will describe how to find the left/right position of the FLP.
FLP
LL
RLP
Drill
Target in the Box at the FLP Fore/Aft Position
48
DigiTrak® LT2™ Operator’s Manual
Locating
4. Turn the receiver 90° from the transmitter heading while holding the receiver steady and level, and
again center the target in the box by moving the receiver forward or backward as needed. This is the
FLP, which is where the transmitter will end up if it does not get a steering command.
5. Mark the location directly below the display screen as the FLP.
FLP
LL
RLP
Drill
Target in the Box at the FLP
NOTE:
Turn Receiver 90° and Move Back and
Forth to Center Target in Box at FLP
Both active and passive interference sources can affect the accuracy of the locate points
and depth readings.
DigiTrak® LT2™ Operator’s Manual
49
Locating
Finding the Transmitter and the LL
Once you have found the FLP, then you will find the LL, where you can determine the depth of the
) on the receiver display. The receiver must be held
transmitter. The LL is represented by a short line (
level and in alignment with the transmitter when over the drill head to obtain an accurate depth reading.
1. At the FLP, turn again to face the drill head (and drill) and walk forward toward the last locate point.
2. Note that the LL appears in the top left of the display.
LL .Moving
Toward Receiver
Receiver
or Box
LL Moving Toward the Box
3. Walk forward and the LL moves closer to the box.
4. Center the LL in the box. You should now see an arrow pointing to the transmitter battery symbol,
which indicates that the value is the projected transmitter depth.
FLP
LL
RLP
Arrow pointing
to transmitter
indicates line is
in box and receiver is above
transmitter or LL.
Drill
Line in the Box at the LL
50
DigiTrak® LT2™ Operator’s Manual
Locating
NOTE:
The arrow that appears below the depth measurement and that points to the transmitter
also appears on the remote display.
5. Mark this location as the LL. You should now be standing above the transmitter.
NOTE:
If the transmitter pitch exceeds ±30% (or 17°) and/or the transmitter depth exceeds 15 ft
(4.5 m), you may not get reliable depth information. Refer to Appendix B: Projected
Versus Actual Depth and Fore/Aft Offset, for information regarding this situation.
Finding the RLP to Confirm Transmitter Heading and Position
Next, you will find the RLP, where you can confirm the transmitter heading and position. Like the FLP, the
RLP is represented as a target (
) on the receiver display. Once the RLP is found, you can connect the
RLP to the FLP to form a line that represents the exact heading of the transmitter. The transmitter is
located at the point where this line intersects the LL. Using the locate points and the LL to find the
transmitter is more reliable and efficient than using the peak signal or shallowest depth.
1. While standing above the transmitter still facing the drill, continue walking toward the drill; the target
will appear in the top left corner of the display and the depth will increase.
Target in Top Left Corner
2. Walk forward until the target moves into the box. You have found the fore/aft position of the RLP. The
next step describes how to find the left/right position of the RLP.
DigiTrak® LT2™ Operator’s Manual
51
Locating
FLP
LL
RLP
Drill
Target in the Box at the RLP
3. Turn the receiver 90° from the transmitter heading while holding the receiver steady and level, and
again put the target in the box by moving the receiver forward or backward as needed.
FLP
LL
RLP
Drill
Target in the Box at the RLP
Turn Receiver 90° and Move Back and
Forth to Center Target in Box at RLP
4. Mark this location as the RLP.
5. Connect the RLP to the FLP by a line. This line represents the actual transmitter heading.
NOTE:
52
Both active and passive interference sources can affect the accuracy of the locate points
and depth readings.
DigiTrak® LT2™ Operator’s Manual
Locating
Plus/Minus ("+/–") Method for Locating the Transmitter
The plus/minus method is the same as that used in DCI’s Mark series receivers for finding the front and
rear locate points. This method is similar to the standard locating method except here you hold the trigger
in and use the signal strength and plus/minus signs for locating. In general, the plus sign ("+") means
move the receiver forward, and the minus sign ("–") means move it backward, to find the locate point.
Front of
Receiver
Plus “+” = Move Forward
Rear of
Receiver
Minus “–” = Move Backward
Using Plus/Minus (“+/–”) Indicators for Finding Locate Points
The front and rear locate points each represent a point where the sign changes from positive to negative.
It doesn’t matter if the receiver and transmitter are facing in the same direction or in opposite directions,
the "+" sign will change to a "–" sign at either of the locate points.
Anywhere along the locate line, when the receiver crosses it, the "–" sign will change to a "+" sign. The
position of the transmitter along the LL can be determined by finding the FLP or RLP.
Finding the FLP
1. Stand out in front of the drill head (facing the drill) at a distance of approximately one drill rod length.
2. Hold in the trigger and approach the FLP. The signal strength will be positive and will increase. Note
that the target appears in the top left corner of the display, and the target gets closer to the box
(locating icon) as you walk toward the FLP.
Target in Top Left Corner
DigiTrak® LT2™ Operator’s Manual
Target Moving Toward the Box
53
Locating
3. Continue to walk forward until the "+" sign changes to a "–". Note that the target has moved into the
box and the signal strength has increased.
Target in the Box
4. Turn the receiver 90° from the transmitter heading while holding the receiver steady and level, and
again find the point where the "+" sign changes to a "–" by moving the receiver forward or backward
as needed; the target should be in the box. This is the FLP, which is where the transmitter will end up
if it does not get a steering command. Release the trigger.
5. Mark the location directly below the display screen as the FLP.
Finding the Transmitter and the LL
1. At the FLP, while continuing to hold in the trigger, turn again to face the drill head (and drill) and walk
forward toward the last locate point.
2. Note that the signal strength is negative and the value is increasing. The LL will appear in the top left
of the display.
3. Continue to walk forward until the "–" sign changes to a "+" sign. Note that the LL is centered in the
box.
LL Moving Toward the Box
54
Line in the Box
DigiTrak® LT2™ Operator’s Manual
Locating
4. Release the trigger to see the depth display.
Height-AboveGround Setting
Replaces Telemetry
Channel Setting
Transmitter
Pitch Replaces
Temperature
Reading
Arrow pointing to tool
head indicates the
line is in the box and
the receiver is above
the transmitter or LL.
Depth Screen
NOTE:
The arrow that appears below the depth measurement and that points to the transmitter
also appears on the remote display when the line is in the box.
5. Mark this location as the LL. You should now be standing above the transmitter.
Confirmation of Exact Heading and Transmitter Position
Like in the standard locating method, you can confirm the actual transmitter heading by locating the rear
locate point or RLP and then drawing a line between the RLP and FLP. That line represents the
transmitter heading. Where this line intersects the LL is the position of the transmitter.
Finding the RLP
1. While standing above the transmitter still facing the drill, hold in the trigger and continue walking
toward the drill; the signal strength will decrease and the target will appear in the top left corner of the
display.
Target in Top Left Corner
DigiTrak® LT2™ Operator’s Manual
55
Locating
2. Walk forward until the "+" sign changes to a "–" sign. Note that the target has moved into the box.
Target in the Box
3. Turn the receiver 90° from the transmitter heading while holding the receiver steady and level, and
find the point where the "–" sign changes to a "+" by moving the receiver forward or backward as
needed; the target should be in the box. This is the RLP. Release the trigger.
4. Mark this location as the RLP.
5. Connect the RLP to the FLP by a line. This line represents the transmitter heading.
Off-Track Locating
The off-track locating technique is useful when it is not possible to walk above the transmitter due to a
surface obstruction or interference. Using the locate line’s perpendicular relationship to the transmitter, it
is possible to track the transmitter heading and also to determine if it is maintaining its intended depth.
This method is only valid if the pitch of the transmitter is close to 0% and the ground surface is level. The
transmitter pitch must also stay constant for the most accurate off-track locating. A full description of the
off-track locating procedure follows.
NOTE:
56
The off-track locating method is only effective when the pitch of the transmitter is the same as
the pitch of the terrain and this pitch value is less than 10%.
DigiTrak® LT2™ Operator’s Manual
Locating
In the figure shown below, a building exists over the intended borepath and the transmitter is just about to
go under the building.
Borepath
Obstruction
Path Around
Obstruction
LL
P1
P2
P3
Predetermined
Distances
Drill
Preparing for Off-Track Locating
1. Find the LL of the transmitter by putting the line in the box.
2. Walk a predetermined distance to the side of the transmitter (P1), sufficient to avoid the obstruction,
and find the LL. Note the slant distance and signal strength (hold trigger in for signal strength) at this
location, and mark the location.
3. Step another predetermined distance further away from the transmitter (P2) and again find the LL.
Note the slant distance and signal strength, and mark this location.
4. Step another predetermined distance further away from the transmitter (P3) and find the LL. Note the
slant distance and signal strength, and mark this location.
DigiTrak® LT2™ Operator’s Manual
57
Locating
5. After finding the three locations to the side of the transmitter, P1, P2, and P3, connect these locations
with a line. This is the locate line. Because the LL runs perpendicular (or at a 90° angle) to the
transmitter, it is possible to determine the heading of the tool. By comparing the slant distances at the
predetermined distances of P1, P2, and P3, as the transmitter progresses you can verify if the tool is
moving away from or closer to the intended borepath. This allows steering corrections to be made.
Borepath
Obstruction
LL
P1
P2
P3
Path Around
Obstruction
Drill
Off-Track Locating
3-1050-00-A
58
DigiTrak® LT2™ Operator’s Manual
DIGITAL CONTROL INCORPORATED
Appendix A:
System Specifications and
Maintenance Requirements
The power requirements, environmental requirements, and equipment maintenance requirements for the
DigiTrak LT2 Locating System are listed below.
Power Requirements
Device
Voltage
Current
DigiTrak LT2 Receiver
14.4 V DC (nominal)
0.25 A DC
DigiTrak LT2 Remote Display
14.4 V DC (nominal)
0.25 A DC
DigiTrak LT2 Battery Charger
12–28 V DC
100–240 V AC, 50/60 Hz
2.0 A DC
Environmental Requirements
Altitude
< 16,404 ft (< 5000 m)
Temperature
-4°F to 140°F (-20°C to 60°C)
Relative Humidity
< 90%
Equipment Maintenance

Turn off all equipment when not in use.

Store the LT2 equipment in cases, away from heat, cold, and moisture. Perform tests to confirm
proper operations.

Clean the LT2 receiver, remote, and battery charger by using a soft moist cloth and detergent.

Do not use chemicals to clean the transmitter.

Clean the LCD screens on the receiver and remote display using a soft cloth without chemicals.
Use plain water if necessary.

Inspect the LT2 equipment daily and contact DCI if you see any damage or problems. Do not disassemble or attempt to repair the equipment.

Do not ship the LT2 locating equipment with batteries inside. Always remove the batteries from
the equipment before shipping.
DigiTrak® LT2™ Operator’s Manual
59
Appendix A
Notes
60
DigiTrak® LT2™ Operator’s Manual
DIGITAL CONTROL INCORPORATED
Appendix B:
Projected Depth Versus Actual
Depth and the Fore/Aft Offset
What Happens When the
Transmitter Is Steep and Deep
The signal field emitted by the transmitter, as shown in Figure B1, consists of a set of elliptical signals or
flux lines. The flux lines indicate the position of the transmitter. When the transmitter is level with respect
to the ground, you will find that the locate line (LL) is directly over the transmitter, and the depth displayed
on the receiver is the actual depth. You will also find that the locate points (FLP and RLP) are at equal
distances from the transmitter. The location of the LL is found at the intersection of the ground and the
horizontal component of the flux field, and the FLP and RLP are found where the vertical components of
the flux field intersect with the ground. Some of the horizontal and vertical components are identified by
short yellow lines in Figure B1.
RLP
LL
FLP
Figure B1. Flux Field and Geometry of FLP, RLP, and LL (side view)
DigiTrak® LT2™ Operator’s Manual
61
Appendix B
Due to the shape of the transmitter’s signal field (flux lines), when it is at a pitch greater than ±30% (±17°)
and/or a depth of 15 ft (4.5 m) or more, the position of the locate line will be some distance ahead of or
behind the transmitter’s actual position. In this case, the depth displayed on the receiver becomes what is
called the projected depth. The transmitter’s distance ahead of or behind the locate line is called the
fore/aft offset.
The projected depth and fore/aft offset, shown in Figure B2, must be accounted for when the transmitter
is steep and/or deep. See the tables provided later in this appendix (Tables A1 and A2) to determine the
actual depth and fore/aft offset when you know the displayed (projected) depth and pitch of the
transmitter.
LP
Fore/Aft Offset
LP
LL
30% (17°)
Pitch
Projected Depth
Actual Depth
Figure B2. Projected Depth vs. Actual Depth and Fore/Aft Offset When Steep and Deep
Figure B2 above shows a transmitter positioned in a drill string that is meant to illustrate drilling at either a
positive or a negative pitch—the pitch is positive if you are drilling left to right, and it is negative if you are
drilling right to left. The transmitter’s signal field is also pitched at the same angle as the transmitter. The
locate line (LL), which is where the depth measurement is taken, is the horizontal component of the
transmitter’s signal field flux lines. That is, the LL is found where the flux lines are horizontal, as illustrated
with short horizontal yellow lines in the figure above.
62
DigiTrak® LT2™ Operator’s Manual
Appendix B
The locate points are also shown in Figure B2. These points are located at the vertical components of the
signal field, as illustrated with short vertical yellow lines in the figure above. Note that the locate points are
not the same distance from the LL when the tool is pitched. Again, this situation requires compensation
for the projected depth and the fore/aft offset.
Using the tables provided below, you can look up the actual depth (Table B1) and the fore/aft offset
(Table B2) based on the receiver’s depth reading (projected depth) and the transmitter pitch. You can
also look up the projected depth (Table B3) if you know the required depth (actual depth) of your installation and you want to find the corresponding projected depth reading that you will see on the receiver
during drilling. The final table (Table B4) provides conversion factors for determining the projected depth
from the actual depth or the actual depth from the projected depth at various transmitter pitches.
Table B1 lists the projected or displayed depth values (shown in red) in 5 ft (1.52 m) increments in the
first column and provides values for the actual depth (shown in green) at different transmitter pitches. For
example, if you have a displayed depth of 25 ft (7.62 m) and your transmitter is at a 40% (22°) pitch, then
you can see from Table B1 that the actual depth of the transmitter is 22 ft 8 in. (6.91 m).
Table B1. Determining Actual Depth from Displayed (Projected) Depth and Pitch
Pitch→
Displayed
Depth ↓
5'
(1.52 m)
10'
(3.05 m)
15'
(4.57 m)
20'
(6.10 m)
25'
(7.62 m)
30'
(9.14 m)
35'
(10.67 m)
40'
(12.19 m)
45'
(13.72 m)
50'
(15.24 m)
±10%
(5.7°)
±20%
(11°)
±30%
(17°)
±40%
(22°)
±50%
(27°)
±60%
(31°)
±75%
(37°)
±90%
(42°)
±100%
(45°)
5'
(1.52 m)
9' 11"
(3.02 m)
14' 11"
(4.55 m)
19' 11"
(6.07 m)
24' 11"
(7.59 m)
29' 10"
(9.09 m)
34' 10"
(10.62 m)
39' 10"
(12.14 m)
44' 9"
(13.64 m)
49' 9"
(15.16 m)
4' 11"
(1.50 m)
9' 9"
(2.97 m)
14' 8"
(4.47 m)
19' 6"
(5.94 m)
24' 5"
(7.44 m)
29' 3"
(8.92 m)
34' 2"
(10.41 m)
39'
(11.89 m)
43' 11"
(13.39 m)
48' 9"
(14.86 m)
4' 9"
(1.45 m)
9' 5"
(2.87 m)
14' 2"
(4.32 m)
18' 10"
(5.74 m)
23' 7"
(7.19 m)
28' 3"
(8.61 m)
33' 1"
(10.08 m)
37' 9"
(11.51 m)
42' 5"
(12.93 m)
47' 2"
(14.38 m)
4' 6"
(1.37 m)
9' 1"
(2.77 m)
13' 7"
(4.14 m)
18' 1"
(5.51 m)
22' 8"
(6.91 m)
27' 2"
(8.28 m)
31' 8"
(9.65 m)
36' 2"
(11.02 m)
40' 9"
(12.42 m)
45' 3"
(13.79 m)
4' 4"
(1.32 m)
8' 8"
(2.64 m)
13'
(3.96 m)
17' 4"
(5.28 m)
21' 8"
(6.60 m)
26'
(7.92 m)
30' 4"
(9.25 m)
34' 8"
(10.57 m)
39'
(11.89 m)
43' 4"
(13.21 m)
4' 2"
(1.27 m)
8' 3"
(2.51 m)
12' 5"
(3.78 m)
16' 6"
(5.03 m)
20' 8"
(6.30 m)
24' 9"
(7.54 m)
28' 11"
(8.81 m)
33'
(10.06 m)
37' 2"
(11.33 m)
41' 3"
(12.57 m)
3' 10"
(1.17 m)
7' 7"
(2.31 m)
11' 5"
(3.48 m)
15' 3"
(4.65 m)
19'
(5.79 m)
22' 10"
(6.96 m)
26' 8"
(8.13 m)
30' 5"
(9.27 m)
34' 3"
(10.44 m)
38' 1"
(11.61 m)
3' 6"
(1.07 m)
7'
(2.13 m)
10' 6"
(3.20 m)
14'
(4.27 m)
17' 6"
(5.33 m)
21'
(6.40 m)
24' 6"
(7.47 m)
28'
(8.53 m)
31' 7"
(9.63 m)
35' 1"
(10.69 m)
2' 6"
(0.76 m)
5'
(1.52 m)
7' 6"
(2.29 m)
10'
(3.05 m)
12' 6"
(3.81 m)
15'
(4.57 m)
17' 6"
(5.33 m)
20'
(6.10 m)
22' 6"
(6.86 m)
25'
(7.62 m)
Table B2 lists the projected or displayed depth values in 5 ft (1.52 m) increments in the first column and
provides values for the fore/aft offset (shown in purple), rounded to the nearest inch (or cm) at different
transmitter pitches.
DigiTrak® LT2™ Operator’s Manual
63
Appendix B
Table B2. Determining Fore/Aft Offset from Displayed (Projected) Depth and Pitch
Pitch→
Displayed
Depth ↓
5'
(1.52 m)
10'
(3.05 m)
15'
(4.57 m)
20'
(6.10 m)
25'
(7.62 m)
30'
(9.14 m)
35'
(10.67 m)
40'
(12.19 m)
45'
(13.72 m)
50'
(15.24 m)
±10%
(5.7°)
±20%
(11°)
±30%
(17°)
±40%
(22°)
±50%
(27°)
±60%
(31°)
±75%
(37°)
±90%
(42°)
±100%
(45°)
4"
(0.10 m)
8"
(0.20 m)
1'
(0.30 m)
1' 4"
(0.41 m)
1' 8"
(0.51 m)
2'
(0.61 m)
2' 4"
(0.71 m)
2' 8"
(0.81 m)
3'
(0.91 m)
3' 4"
(1.02 m)
8"
(0.20 m)
1' 4"
(0.41 m)
2'
(0.61 m)
2' 7"
(0.79 m)
3' 3"
(0.99 m)
3' 11"
(1.19 m)
4' 7"
(1.40 m)
5' 3"
(0.69 m)
5' 11"
(1.80 m)
6' 7"
(2.01 m)
11"
(0.28 m)
1' 11"
(0.58 m)
2' 11"
(0.89 m)
3' 10"
(1.17 m)
4' 10"
(1.47 m)
5' 10"
(1.78 m)
6' 9"
(2.06 m)
7' 9"
(2.36 m)
8' 8"
(2.64 m)
9' 4"
(2.84 m)
1' 3"
(0.38 m)
2' 6"
(0.76 m)
3' 9"
(1.14 m)
5'
(1.52 m)
6' 3"
(1.91 m)
7' 6"
(2.29 m)
8' 9"
(2.67 m)
10'
(3.05 m)
11' 4"
(3.45 m)
12' 7"
(3.84 m)
1' 7"
(0.48 m)
3' 1"
(0.94 m)
4' 7"
(1.40 m)
6' 1"
(1.85 m)
7' 7"
(2.31 m)
9' 2"
(2.79 m)
10' 8"
(3.25 m)
12' 2"
(3.71 m)
13' 8"
(4.17 m)
15' 3"
(4.65 m)
1' 9"
(0.53 m)
3' 6"
(1.07 m)
5' 4 "
(1.63 m)
7' 1"
(2.16 m)
8' 10"
(2.69 m)
10' 7"
(3.23 m)
12' 5"
(3.78 m)
14' 2"
(4.32 m)
15' 11"
(4.85 m)
17' 8"
(5.38 m)
2' 1"
(0.64 m)
4' 2"
(1.27 m)
6' 3"
(1.91 m)
8' 4"
(2.54 m)
10' 5"
(3.18 m)
12' 6"
(3.81 m)
14' 8"
(4.47 m)
16' 9"
(5.11 m)
18' 10"
(5.74 m)
20' 11"
(6.38 m)
2' 5"
(0.74 m)
4' 9"
(1.45 m)
7' 1"
(2.16 m)
9' 6"
(2.90 m)
11' 10"
(3.61 m)
14' 2"
(4.32 m)
16' 7"
(5.05 m)
18' 11"
(5.77 m)
21' 3"
(6.48 m)
23' 8"
(7.21 m)
2' 6"
(0.76 m)
5'
(1.52 m)
7' 6"
(2.29 m)
10'
(3.05 m)
12' 6"
(3.81 m)
15'
(4.57 m)
17' 6"
(5.33 m)
20'
(6.10 m)
22' 6"
(6.86 m)
25'
(7.62 m)
Table B3 lists the actual depths in 5 ft (1.52 m) increments in the first column and provides projected
depth values at different transmitter pitches.
Table B3. Determining Projected Depth from Actual Depth and Pitch
Pitch→
Actual
Depth ↓
5'
(1.52 m)
10'
(3.05 m)
15'
(4.57 m)
20'
(6.10 m)
25'
(7.62 m)
30'
(9.14 m)
35'
(10.67 m)
40'
(12.19 m)
45'
(13.72 m)
50'
(15.24 m)
64
±10%
(5.7°)
±20%
(11°)
±30%
(17°)
±40%
(22°)
±50%
(27°)
±60%
(31°)
±75%
(37°)
±90%
(42°)
±100%
(45°)
5'
(1.52 m)
10' 1"
(3.07 m)
15' 1"
(4.60 m)
20' 1"
(6.12 m)
25' 2"
(7.67 m)
30' 2"
(9.19 m)
35' 2"
(10.72 m)
40' 2"
(12.24 m)
45' 3"
(13.79 m)
50' 3"
(15.32 m)
5' 2"
(1.57 m)
10' 3"
(3.12 m)
15' 5"
(4.70 m)
20' 6"
(6.25 m)
25' 8"
(7.82 m)
30' 9"
(9.37 m)
35' 11"
(10.95 m)
41'
(12.50 m)
46' 2"
(14.07 m)
51' 3"
(15.62 m)
5' 3"
(1.60 m)
10' 7"
(3.23 m)
15' 10"
(4.83 m)
21' 2"
(6.45 m)
26' 5"
(8.05 m)
31' 9"
(9.68 m)
37'
(11.28 m)
42' 3"
(12.88 m)
47' 7"
(14.50 m)
52' 10"
(16.10 m)
5' 6"
(1.68 m)
10' 11"
(3.33 m)
16' 5"
(5.00 m)
21' 11"
(6.68 m)
27' 5"
(8.36 m)
32' 10"
(10.01 m)
38' 4"
(11.68 m)
43' 10"
(13.36 m)
49' 3"
(15.01 m)
54' 9"
(16.69 m)
5' 8"
(1.73 m)
11' 4"
(3.45 m)
17'
(5.18 m)
22' 8"
(6.91 m)
28' 4"
(8.64 m)
34'
(10.36 m)
36' 8"
(11.18 m)
45' 4"
(13.82 m)
51'
(15.54 m)
56' 8"
(17.27 m)
5' 11"
(1.80 m)
11' 9"
(3.58 m)
17' 8"
(5.38 m)
23' 6"
(7.16 m)
29' 5"
(8.97 m)
35' 3"
(10.74 m)
41' 2"
(12.55 m)
47'
(14.33 m)
52' 2"
(15.90 m)
58' 9"
(17.91 m)
6' 3"
(1.91 m)
12' 5"
(3.78 m)
18' 7"
(5.66 m)
24' 9"
(7.54 m)
31'
(9.45 m)
37' 2"
(11.33 m)
43' 4"
(13.21 m)
49' 7"
(15.11 m)
55' 9"
(16.99 m)
61' 11"
(18.87 m)
6' 6"
(1.98 m)
13'
(3.96 m)
19' 6"
(5.94 m)
26'
(7.92 m)
32' 6"
(9.91 m)
39'
(11.89 m)
45' 6"
(13.87 m)
52'
(15.85 m)
58' 6"
(17.83 m)
64' 11"
(19.79 m)
7' 6"
(2.29 m)
15'
(4.57 m)
22' 6"
(6.86 m)
30'
(9.14 m)
37' 6"
(11.43 m)
45'
(13.72 m)
52' 6"
(16.00 m)
60'
(18.29 m)
67' 6"
(11.43 m)
75'
(22.86 m)
DigiTrak® LT2™ Operator’s Manual
Appendix B
Table B4 allows you to calculate the exact projected depth reading as well as the actual depth using a
multiplier. Values for the multiplier, or conversion factor, are provided at different transmitter pitches.
Table B4. Conversion Factors for Calculating Exact Projected Depth or Actual Depth
Pitch →
From Actual to
Projected Depth
From Projected
to Actual Depth
±10%
(5.7°)
±20%
(11°)
±30%
(17°)
±40%
(22°)
±50%
(27°)
±60%
(31°)
±75%
(37°)
±90%
(42°)
1.005
1.025
1.06
1.105
1.155
1.212
1.314
1.426
0.995
0.975
0.943
0.905
0.866
0.825
0.761
0.701
For example, referring to Table B4, if you have a required (actual) depth of 24 ft (7.32 m), you can
determine the receiver’s projected depth reading at a 30% (17°) pitch. You will use the first row of
conversion factors (From Actual to Projected Depth) to select the corresponding value for a pitch of 30%,
which is 1.06. Multiply this value by the required depth, which is 24, and you will find that your receiver’s
projected depth reading at the locate line should display as 25 ft 5 in. (7.75 m)
Using the projected depth displayed on your receiver, you can calculate the actual depth of the
transmitter using the second row of conversion factors. Select the corresponding conversion factor
associated with your pitch value, then multiply that value by the projected depth. For example, if your
pitch is 30% and your projected depth reading is 24 ft (7.32 m), then you would multiply 0.943 by 24 to
determine that the actual depth of the transmitter is 22.63 ft or 22 ft 8 in. (6.90 m).
DigiTrak® LT2™ Operator’s Manual
65
Appendix B
Notes
66
DigiTrak® LT2™ Operator’s Manual
DIGITAL CONTROL INCORPORATED
Appendix C:
Calculating Depth Based on
Distance Between FLP and RLP
It is possible to estimate the transmitter depth should the information displayed on the receiver become
unreliable. This is only possible if you know the transmitter pitch and the positions of the front locate point
(FLP) and the rear locate point (RLP) and if the ground surface is level.
To estimate the transmitter depth, first measure the distance between the FLP and the RLP. The pitch of
the transmitter must also be reliably known. Using the Depth Estimation Table below, find the divider that
most closely corresponds to the transmitter pitch. Then use the following formula to estimate the depth:
Distance between FLP and RLP
Depth 
Divider
For example, if the transmitter pitch is 34% (or 18.8°) then the corresponding divider value (from the
table) is 1.50. In this example, the distance between the FLP and the RLP is 11.5 ft (3.5 m). The depth
would be:
11.5 ft
Depth 
 7.66 ft or approximately 7.7 ft (2.35 m)
1.50
Table C1. Depth Estimation Table
Pitch ( % / ° )
Divider
Pitch ( % / ° )
Divider
Pitch ( % / ° )
Divider
0 / 0.0
1.41
34 / 18.8
1.50
68 / 34.2
1.74
2 / 1.1
1.41
36 / 19.8
1.51
70 / 35.0
1.76
4 / 2.3
1.42
38 / 20.8
1.52
72 / 35.8
1.78
6 / 3.4
1.42
40 / 21.8
1.54
74 / 36.5
1.80
8 / 4.6
1.42
42 / 22.8
1.55
76 / 37.2
1.82
10 / 5.7
1.42
44 / 23.7
1.56
78 / 38.0
1.84
12 / 6.8
1.43
46 / 24.7
1.57
80 / 38.7
1.85
14 / 8.0
1.43
48 / 25.6
1.59
82 / 39.4
1.87
16 / 9.1
1.43
50 / 26.6
1.60
84 / 40.0
1.89
18 / 10.2
1.44
52 / 27.5
1.62
86 / 40.7
1.91
20 / 11.3
1.45
54 / 28.4
1.63
88 / 41.3
1.93
22 / 11.9
1.45
56 / 29.2
1.64
90 / 42.0
1.96
24 / 13.5
1.46
58 / 30.1
1.66
92 / 42.6
1.98
26 / 14.6
1.47
60 / 31.0
1.68
94 / 43.2
2.00
28 / 15.6
1.48
62 / 31.8
1.69
96 / 43.8
2.02
30 / 16.7
1.48
64 / 32.6
1.71
98 / 44.4
2.04
32 / 17.7
1.49
66 / 33.4
1.73
100 / 45.0
2.06
DigiTrak® LT2™ Operator’s Manual
67
Appendix C
Notes
3-1050-00-A
68
DigiTrak® LT2™ Operator’s Manual
DIGITAL
CONTROL
INCORPORATED
19625 62nd Ave. S., Suite B-103  Kent, WA 98032 USA  (425) 251-0559 OR (800) 288-3610  FAX (253) 395-2800
www.digitrak.com (Web Site)
DCI@digital-control.com (E-mail)
LIMITED WARRANTY
Digital Control Incorporated ("DCI") warrants that when shipped from DCI each DCI product (“DCI Product”) will
conform to DCI’s current published specifications in existence at the time of shipment and will be free, for the
warranty period (“Warranty Period”) described below, from defects in materials and workmanship. The limited
warranty described herein (“Limited Warranty”) is not transferable, shall extend only to the first end-user (“User”)
purchasing the DCI Product from either DCI or a dealer expressly authorized by DCI to sell DCI Products
(“Authorized DCI Dealer”), and is subject to the following terms, conditions and limitations:
1. A Warranty Period of twelve (12) months shall apply to the following new DCI Products: receivers/locators,
remote displays, battery chargers and rechargeable batteries, and DataLog® modules and interfaces. A Warranty
Period of ninety (90) days shall apply to all other new DCI Products, including transmitters, accessories, and
software programs and modules. Unless otherwise stated by DCI, a Warranty Period of ninety (90) days shall
apply to: (a) a used DCI Product sold either by DCI or by an Authorized DCI Dealer who has been expressly
authorized by DCI to sell such used DCI Product; and (b) services provided by DCI, including testing, servicing,
and repairing an out-of-warranty DCI Product. The Warranty Period shall begin from the later of: (i) the date of
shipment of the DCI Product from DCI, or (ii) the date of shipment (or other delivery) of the DCI Product from an
Authorized DCI Dealer to User.
2. DCI's sole obligation under this Limited Warranty shall be limited to either repairing, replacing, or adjusting, at
DCI's option, a covered DCI Product that has been determined by DCI, after reasonable inspection, to be
defective during the foregoing Warranty Period. All warranty inspections, repairs and adjustments must be
performed either by DCI or by a warranty claim service authorized in writing by DCI. All warranty claims must
include proof of purchase, including proof of purchase date, identifying the DCI Product by serial number.
3. The Limited Warranty shall only be effective if: (i) within fourteen (14) days of receipt of the DCI
Product, User mails a fully-completed Product Registration Card to DCI; (ii) User makes a reasonable
inspection upon first receipt of the DCI Product and immediately notifies DCI of any apparent defect; and
(iii) User complies with all of the Warranty Claim Procedures described below.
WHAT IS NOT COVERED
This Limited Warranty excludes all damage, including damage to any DCI Product, due to: failure to follow DCI’s
user’s manual and other DCI instructions; abuse; misuse; neglect; accident; fire; flood; Acts of God; improper
applications; connection to incorrect line voltages and improper power sources; use of incorrect fuses;
overheating; contact with high voltages or injurious substances; or other events beyond the control of DCI. This
Limited Warranty does not apply to any equipment not manufactured or supplied by DCI nor, if applicable, to any
damage or loss resulting from use of any DCI Product outside the designated country of use. By accepting a DCI
Product and not returning it for a refund within thirty (30) days of purchase, User agrees to the terms of this
Limited Warranty, including without limitation the Limitation of Remedies and Liability described below, and
agrees to carefully evaluate the suitability of the DCI Product for User's intended use and to thoroughly read and
strictly follow all instructions supplied by DCI (including any updated DCI Product information which may be
obtained at the above DCI website). In no event shall this Limited Warranty cover any damage arising during
shipment of the DCI Product to or from DCI.
User agrees that the following will render the above Limited Warranty void: (i) alteration, removal or tampering
with any serial number, identification, instructional, or sealing labels on the DCI Product, or (ii) any unauthorized
disassembly, repair or modification of the DCI Product. In no event shall DCI be responsible for the cost of or any
damage resulting from any changes, modifications, or repairs to the DCI Product not expressly authorized in
writing by DCI, and DCI shall not be responsible for the loss of or damage to the DCI Product or any other
equipment while in the possession of any service agency not authorized by DCI.
3-1050-00-A
Page 1 of 2
DCI reserves the right to make changes in design and improvements upon DCI Products from time to time, and
User understands that DCI shall have no obligation to upgrade any previously manufactured DCI Product to
include any such changes.
The foregoing Limited Warranty is DCI’s sole warranty and is made in place of all other warranties, express or
implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose
and any implied warranty arising from course of performance, course of dealing, or usage of trade. If DCI has
substantially complied with the warranty claim procedures described below, such procedures shall constitute
User’s sole and exclusive remedy for breach of the Limited Warranty.
LIMITATION OF REMEDIES AND LIABILITY
In no event shall DCI nor anyone else involved in the creation, production, or delivery of the DCI Product
be liable for any damages arising out of the use or inability to use the DCI Product, including but not
limited to indirect, special, incidental, or consequential damages or for any cover, loss of information,
profit, revenue or use based upon any claim by User for breach of warranty, breach of contract,
negligence, strict liability, or any other legal theory, even if DCI has been advised of the possibility of
such damages. In no event shall DCI’s liability exceed the amount User has paid for the DCI Product. To
the extent that any applicable law does not allow the exclusion or limitation of incidental, consequential
or similar damages, the foregoing limitations regarding such damages shall not apply.
This Limited Warranty gives you specific legal rights, and you may also have other rights which vary from state to
state. This Limited Warranty shall be governed by the laws of the State of Washington.
WARRANTY CLAIM PROCEDURES
1. If you are having problems with your DCI Product, you must first contact the Authorized DCI Dealer where it
was purchased. If you are unable to resolve the problem through your Authorized DCI Dealer, contact DCI’s
Customer Service Department in Kent, Washington, USA at the above telephone number between 6:00 a.m. and
6:00 p.m. Pacific Time and ask to speak with a customer service representative. (The above “800” number is
available for use only in the USA and Canada.) Prior to returning any DCI Product to DCI for service, you must
obtain a Return Merchandise Authorization (RMA) number. Failure to obtain a RMA may result in delays or return
to you of the DCI Product without repair.
2. After contacting a DCI customer service representative by telephone, the representative will attempt to assist
you in troubleshooting while you are using the DCI Product during actual field operations. Please have all related
equipment available together with a list of all DCI Product serial numbers. It is important that field troubleshooting
be conducted because many problems do not result from a defective DCI Product, but instead are due to either
operational errors or adverse conditions occurring in the User’s drilling environment.
3. If a DCI Product problem is confirmed as a result of field troubleshooting discussions with a DCI customer
service representative, the representative will issue a RMA number authorizing the return of the DCI Product and
will provide shipping directions. You will be responsible for all shipping costs, including any insurance. If, after
receiving the DCI Product and performing diagnostic testing, DCI determines the problem is covered by the
Limited Warranty, required repairs and/or adjustments will be made, and a properly functioning DCI Product will
be promptly shipped to you. If the problem is not covered by the Limited Warranty, you will be informed of the
reason and be provided an estimate of repair costs. If you authorize DCI to service or repair the DCI Product, the
work will be promptly performed and the DCI Product will be shipped to you. You will be billed for any costs for
testing, repairs and adjustments not covered by the Limited Warranty and for shipping costs. In most cases,
repairs are accomplished within 1 to 2 weeks.
4. DCI has a limited supply of loaner equipment available. If loaner equipment is required by you and is available,
DCI will attempt to ship loaner equipment to you by overnight delivery for your use while your equipment is being
serviced by DCI. DCI will make reasonable efforts to minimize your downtime on warranty claims, limited by
circumstances not within DCI’s control. If DCI provides you loaner equipment, your equipment must be received
by DCI no later than the second business day after your receipt of loaner equipment. You must return the loaner
equipment by overnight delivery for receipt by DCI no later than the second business day after your receipt of the
repaired DCI Product. Any failure to meet these deadlines will result in a rental charge for use of the loaner
equipment for each extra day the return of the loaner equipment to DCI is delayed.
3-1050-00-A
Page 2 of 2

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