LTI 20/20 TruSpeed User Manual

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Page 1

User’s Manual

Page 2

LTI 20/20 TruSpeed User’s Manual

Part Number 0144805

Information in this document is subject to change without notice and does not represent a commitment on the part of Laser Technology Inc. No part of this manual may be reproduced in any form or by any means, electronic or mechanical, including photocopying, recording, or information storage and retrieval sys t ems, for any purpose other than the purchaser’s personal use, without the express written consent of Laser Technology, Inc.

Trademarks:

TruSpeed is trademark of Laser Technology, Inc. All other trademarks are the property of their respective owner.

Patents:

This product is covered by pending patent applications and/or one or more of the following issued patents: 5,359,404 5,521,696 5,715,045

LTI Contact Information:

Laser Technology, Inc. 7070 S. Tucson Way Centennial, CO 80112 USA

Phone: 1-303-649-1000 Fax: 1-303-649-9710 Web Site: www.lasertech.com

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LTI 20/20 TruSpeed User’s Manual Table of Contents

Page 1

LTI 20/20 TruSpeed User’s Manual Table of Contents

Section #1 - Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Unpacking Your TruSpeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

TruSpeed Basic Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Available Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Important Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

About the TruSpeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

LCD Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Test Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Sighting Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Buttons on the Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Optional Shoulder Stock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Attaching the Shoulder Stock . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Removing the Shoulder Stock . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Installing / Removing the Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Removing the Battery Tube from the Handle . . . . . . . . . . . . . . 8

Inserting the Batteries in Battery Tube . . . . . . . . . . . . . . . . . . . 8

Re-inserting the Battery Tube into the Handle . . . . . . . . . . . . . . 8

Battery Voltage Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Powering ON the TruSpeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Powering OFF the TruSpeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Understanding the Display Indicators . . . . . . . . . . . . . . . . . . . . . . . . 11

Miscellaneous Display Features . . . . . . . . . . . . . . . . . . . . . . . . 12

Adjusting the Aiming Reticle's Intensity . . . . . . . . . . . . . . . . . . . . . . 13

Restoring Factory Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Listening to the TruSpe ed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Understanding Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

RFI Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual Page 2

Section #2 - Speed Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Taking a Sample Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Choosing a Roadside Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Line of Sight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

The Cosine Effect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Measuring a Moving Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Using the Weather Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Using the Continuous Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Laser Jammer Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Section #3 - Test Mode and Instrument Tests . . . . . . . . . . . . . . . . . . 24

Display Integrity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Scope Alignment Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Instrument Confidence Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Fixed Distance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Delta Distance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Self Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Model and Firmware Version Number Display . . . . . . . . . . . . . . . . . . . . 30

Serial Number Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Section #4 - Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Section #5 - Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Section #6 - Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Section #7 - Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Page 5

Section #1 - Getting Started

Page 3

Section #1 - Getting Started

Unpacking Your TruSpeed

When you receive your TruSpeed, check to make sure that you have received everything that you ordered, and that it all arrived undamaged.

TruSpeed Basic Package

F TruSpeed instrument with polarizing filter F Two C cell batteries F User's manual

Available Accessories

You may have also ordered one or more of these optional accessories:

F TruSpeed Battery Eliminator F Carrying Case F Shoulder Stock F TruSpeed Yoke (includes adapter for monopod/tripod mounting) F Monopod F Tripod

Important Safety Information

Avoid staring directly at the laser beam for prolonged periods

• The TruSpeed is designed to meet FDA eye safety requirements and is classified as eye-safe to Class 1 limits, which means that virtually no hazard is associated with directly viewing the laser output under normal conditions. As with any laser device, reasonable precautions should be taken in its operation. It is re comme nded that you avoid staring into the transmit lens while firing the laser. The use of optical instruments with this product may increase eye hazard.

Never attempt to view the sun through the scope.

• Looking at sun through the scope may permanently damage your eyes.

Never point the instrument directly at the sun.

• Exposing the lens system to direct sunlight, even for a brief period, may permanently damage the laser transmitter.

Do not operate the instrument in extreme temperatures.

• TruSpeed components are rated for a temperature range of

-22° F to +140° F. Do not operate the instrument in temperatures outside that range.

Page 6

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual

1. Sighting Scope

2. Transmit Lens

3. Receive Lens

4. Battery Release

5. Shoulder Stock Release

6. Battery Tube

7. Handle / Battery Compartment

8. TRIGGER

9. Shoulder Stock Attachment Point

10. Test Port

11. Speaker

12. Keypad

13. LCD Screen

Figure #1

Page 4

About the TruSpeed

Laser Technology's LTI 20/20 TruSpeed is part of the Laser Technology family of handheld laser speed and ranging devices. Compared to our other laser speed measurement products, the TruSpeed includes:

• Simplified menus and options.

• Built-in Weather Mode that is an alternate speed measure ment mode. It is a simplified gating option. This factory-defined gate ensures that targets are beyond the range where rain and snow can af fect the lase r's ability to capture a speed reading.

• Continuous Mode that is an alternate speed measurement mode. It displays one speed reading after another until you release the TRIGGER.

• Liquid Crystal Display (LCD) screen for instant access to measurements and options.

• Sighting scope with in-scope aiming reticle and in-scope speed measurement display.

• Seven-button keypad that provides quick and easy access to the instrument functions.

• Sounds and visual indicators that ensure confidence of positive target acquisition.

• Test port for verifying reference timing.

Figure 1 shows the TruSpeed's front and rear panels.

Page 7

Section #1 - Getting Started

Page 5

Sensors

The TruSpeed has two lenses on the front panel. The top lens transmits the infrared laser signals. The bottom lens receives signals back from the target and feeds signal information to the internal circuitry.

The internal circuitry consists of a laser range sensor and timing, analysis, computation, and display circuits. The TruSpeed determines distance through its laser range sensor, by measuring the time of flight of short pulses of infr ared light. The TruSpeed has a broad spectrum of sensitivity, and can work with both reflective and non-reflective targets. The maximum measurement distance varies with target and environmental conditions. The absolute maximum is about 2,000 feet.

LCD Screen

The LCD Screen displays menu items, option indicators, error codes, and speed measurement results.

Test Port

Your TruSpeed includes a T est Port located on the rear panel. The T est Port allows you to connect the instrument to a remote computer for laboratory testing purposes only.

Sighting Scope

Mounted on top of the TruSpeed is a single-power sighting scope. The scope features:

• The polarizing light filter is adjustable to optimize viewing contrast. Figure #2 shows the polarizing light filter's adjustment ring.

• In-scope speed measurement display.

• The in-scope aiming reticle helps you aim accurately to the target. Figure #3 shows reticle. This reticle represents the size of the laser beam.

You can vary the intensity of the aiming

reticle to account for different lighting conditions. For more information, see page 13.

Figure #2

Figure #3

Page 8

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual Page 6

Buttons on the Keypad

The T ruSpeed has a 7-but ton keypad located on the r ear panel of the instrument. The buttons provide easy access to the instrument functions. The table below lists the buttons and the functions of each.

Button Name Function

Speed

Mode

Activates the instrument’s speed measurement mode.

Weather

Mode

Continuous

Mode

Backlight Toggles the display backlight

Test

Mode

Brightness

Control

Power ON/

OFF

Activates the instrument’s alternate speed measurement mode: simplified gating option. Targets must be at a distance greater than 200 feet.

Activates the instrument’s alternate speed measurement mode: displays one speed reading after another until you release the trigger.

ON/OFF Activates the instrument’s Test Mode, which

allows you to verify the TruSpeed’s mechanics.

Varies the intensity of the in-scope aiming reticle.

Press and release to power ON the instrument.

Press-and-Hold for approximately 3 seconds to power OFF the instrument.

Page 9

Section #1 - Getting Started

Figure #4

(Enlarged to

show step #1)

Figure #5

(Enlarged to

show step #1)

Page 7

Optional Shoulder Stock

The Shoulder Stock is available for purchase as an accessory item. The Shoulder Stock helps stabilize the TruSpeed while capturing speed measurements and is designed for either left-handed or right-handed use.

Attaching the Shoulder Stock

1. Flip the Shoulder Stock Release toward the front of the TruSpeed.

2. Align the pronged-end of the Shoulder Stock with the Shoulder Stock Attachment Point as shown in Figure #4.

3. Slide the Shoulder Stock straight into the two holes.

4. Flip the Shoulder Stock Release toward the rear of the TruSpeed to secure the Shoulder Stock.

Removing the Shoulder Stock

1. Turn the Shoulder Stock Release toward the front of the TruSpeed. Continue to hold the Shoulder Stock Release in this position.

2. Pull the Shoulder Stock straight toward you.

Page 10

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual

Figure #6

Figure #7

Page 8

Installing / Removing the Batteries

Two C cell batteries are required to power the TruSpeed. The batteries are located in the Battery Tube inside the Handle.

Removing the Battery Tube from the Handle

1. Hold the T ruSpeed with one hand and hold the bottom of the Handle with your other hand.

2. Press the Battery Release, the black button on either side, just behind the TRIGGER.

3. Slide the Battery Tube out of the Battery Compartment.

Inserting the Batteries in Battery Tube

1. With the positive end pointing toward the bottom of the Battery Tube, align the battery with the opening of the Battery Tube as shown in Figure #7A and B.

2. Insert the battery into the Battery Tube and slide the battery to the top of the tube.

3. Position the second battery as described in step #1 and insert the battery into the tube as shown in Figure #7C.

To remove the batteries from the Battery Tube, just reverse the above

instructions.

Re-inserting the Battery Tube into the Handle

The Battery Compartment is designed to the Battery Tube only fits one way.

1. Align the notched edges of the Battery Tube with those of the Battery Compartment.

2. Slide the tube into the compartment until it locks into place.

Page 11

Section #1 - Getting Started

Page 9

Battery Voltage Level

The TruSpeed continuously monitors its power source. LTI has defined an acceptable battery voltage range to ensure that the instrument h as sufficient battery voltage to guarantee correct operation.

Appearance

of the

Battery Icon Explanation

3 segments are lit and the display is steady. The estimated battery life is between 67% and 100%.

2 segments are lit and the display is steady. The estimated battery life is between 34% and 66%.

1 segment is lit and the display is flashing. The estimated battery life is between 33% and 11%.

Only the outline is lit, no segments are lit and the display is steady. The estimated battery life approximately 10%, and the instrument is still operating normally.You should replace the batteries as soon as possible.

Only the outline is lit, no segments are lit and the display is flashing. “bAtt” appears in the upper display and “CHAng” appears in the lower display. All system operation will be locked out and the only

button that will work is the Button, which you can use to power oFF the TruSpeed.

Page 12

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual Page 10

Powering ON the TruSpeed

1. Press the TRIGGER or the button. Briefly, the instrument’s microcontroller will perform the Self Test.

•

If all tests prove positive,

and “SELF” appears in the lower display as Figure #8 shows. Then the Speed Mode will be active and the Speed Measurement Screen (page 16) will be displayed.

If all tests do not prove positive,

• in the upper display (page 15).

If the instrument fails the Self Test:

1. Press the button to power OFF the TruSpeed.

2. Press the button to once again power ON the TruSpeed and repeat the Self Test.

“PASS” appears briefly in the upper display

the appropriate error code will appear

¶ If the error repeats and you need assistance, contact LTI.

See the inside front cover for LTI contact information.

Figure #8

Powering OFF the TruSpeed

1. Press and hold the button for approximately 3 seconds. To help save its batteries, the TruSpeed has a factory-defined power

OFF interval. The instrument will automatically power OFF if there is no activity for a period of 15 minutes. Instrument activity includes any button presses.

Page 13

Understanding the Display Indicators

Figure #9

Figure #9 shows the LCD Screen.The table below lists the display indicators and the function of each. These are presented in order of location on the screen, from left to right starting in the upper left corner.

Display

Indicator Function Explanation

Visible:

Display

Backlight

Upper

Display

The LED backlight is ON.

Not Visible:

Provides access to speed measurements and messages.

The LED backlight is OFF.

Section #1 - Getting Started

Page 11

Speed

Units

Test

Mode

Continuous

Mode

Weather

Mode

Lower

Display

Range

Units

Laser

Fire

Battery Identifies the approximate current

MPH: Miles per Hour. km/h: Kilometers per Hour.

The instrument’s Test Mode is active

(page 24).

The instrument’s Continuous Mode is active (page 22).

The instrument’s Weather Mode is active (page 21).

Provides access to range measurements and messages.

Feet.

Meters.

The instrument’s laser is firing.

battery voltage. The indicator shown here represents 100%-67% battery life (page 9).

Page 14

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual Page 12

Miscellaneous Display Features

The table below lists the miscellaneous display features.

Display

Feature Explanation

bAtt

CHAng

br xx The in-scope aiming reticle’s intensity

-d1- Delta Distance Test - Distance #1. Appears

-d2- Delta Distance Test - Distance #2. Appears

dEF

CLEAr

E xx Error Code. An error condition has occurred

PASS Successful completion of the instrument

SELF The instrument is performing (or has

SN Serial Number. “SN” appears in the upper

tt The instrument’s test tone is active. Used

You must replace the batteries. Appears in the upper and lower displays.

setting. Appears in the upper display.

in the upper display.

in the upper display. The factory default settings have been

restored. Appears in the upper and lower displays.

during a speed measurement attempt or in the system hardware. Appears in the upper display.

Self Test. Appears in the upper display.

performed) the instrument Self Test. Appears in the lower display.

display. The serial number associated with the unit appears in the lower display.

during the Scope Alignment Test. Appears in the upper display.

Refer to

Pages

Page 15

Section #1 - Getting Started

Figure #10

Figure #11

Adjusting the Aiming Reticle's Intensity

The in-scope aiming reticle has eight intensity settings from DIM (01) to BRIGHT (08).

1. Press the button. The display should look similar to Figure #10. The factory default setting is "br 05" as shown in the figure.

2. Press the button until the desired setting is achieved. It's easy to get the desired setting if you look through the scope while making the adjustment.

¶ Each time you press the button, the "br xx" value

increases by 1.

¶ If you press the button while "br 08" is displayed,

you will see "br 01" next.

3. Press the TRIGGER to return to the measurement mode that was most recently active.

• Powering OFF the instrument does not change this setting. The

next time the instrument is powered ON, the setting will be the same.

Page 13

Restoring Factory Default Settings

1. Verify that the TruSpeed is powered ON.

2. Simultaneously, press and hold the

button and “dEF CLEAr” appears on the screen. The display should look like Figure #11.

3. Release both buttons. The Speed Mode will be active and the Speed Measurement Screen will be displayed.

the button until

Page 16

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual

Figure #11

Page 14

Listening to the TruSpeed

The TruSpeed emits a variety of beeps and tones during use. The sounds vary and depend on what the instrument is doing. The table below lists and explains each of the sounds.

Sound Explanation

3 Low-Pitched and

1 High-Pitched Beeps

Low-Pitched Growl The instrument is attempting to lock onto a

1 Low-Pitched and

2 High-Pitched Beeps

High-Pitched Double Beep

High-Pitched

Triple Beep

High-Pitched

Oscillating Ring

Low-Pitched Single Beep

At Power ON.

target. The instrument was not able to complete the

intended speed measurement due to an error. An error code will be displayed to the indicate the nature of the error (page 15).

The instrument successfully completed the intended speed measurement.

The laser’s return sensor detected interference from a light source such as a xenon headlight or laser jammer device. The speed reading is valid.

Jam tone. The instrument’s laser return sensor is being overwhelmed by interference from a light source such as a headlight or laser jammer device.

At Power OFF.

Understanding Error Conditions

Although it’s rare, error conditions can occur during a measurement attempt or in the system hardware. To make sure that you never get an erroneous speed reading, the T ruSpeed monitors both the system hardware a nd the measurement. When the instrument detects an error condition, it displays an error code instead of a measurement.

Figure #11 shows an example of an error code, “E 03” Measurement error - unstable targeting.

Page 17

Section #1 - Getting Started

Error Codes

The table below lists and explains each of the possible error codes.

Code Explanation

E 01 Measurement Error - the target was out of range or was too

close.

E 02 Measurement Error - insufficient data. The unit does not have

enough data to measure speed.

Possible Cause:

E 03 Measurement Error - unstable targeting. Data is not stable

enough to measure speed.

Possible Causes:

Measurement Error - low level of interference from a light source such as a xenon headlight.

E 07 Jam Detect - high level of interference from a light source

such as a xenon headlight. E 52 Temperature too cold. Stop operation. E 53 Temperature too hot. Stop operation.

E 55 E57 E 56 E58

E 60 Memory failure. Please turn OFF unit and try again. If the

E 62 Receiver Failure. Please turn OFF unit and try again. If the

E 99 General System Failure. Please contact LTI.

Calibration Errors. Please turn OFF unit and try again.

If the same error is continuously repeated, please contact

LTI.

same error is continuously repeated, please contact LTI.

early release of the TRIGGER or time-out.

poor aiming or panning off the target.

Page 15

**See inside front cover for LTI contact information.

RFI Considerations

The T ruSpeed does not display a specific error message indicating the presence of radio frequency interference (RFI). The instrument's electronics have been designed for optimum RFI immunity. If RFI is present, the instrument displays an error code. The exact code depends on the level and nature of the RFI.

Page 18

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual

Figure #12

Figure #13

Page 16

Section #2 - Speed Measurements

When you power ON the TruSpeed the instrument will perform the Self Test. Figure #12 shows successful completion of the Self Test. See page 30 for more information about the Self Test.

The next screen is automatically displayed and should look similar to Figure #13.

• The dashes that appear in the upper display indicate where the speed measurement will appear.

• “MPH” means the speed will be measured in miles per hour.

• The dashes that appear in the lower display indicates where the distance to the target vehicle will appear.

• "F" means the distance will be measured in feet.

• The Battery Icon indicates the approximate battery voltage level (page 9).

Page 19

Section #2 - Speed Measurements

Figure #14

Taking a Sample Measurement

1. Ensure that the TruSpeed is powered ON and that the Speed Mode is active.

2. Use the sighting scope and aiming reticle to aim the instrument to a convenient target - an interior wall will do.

3. To fire the laser:

¶ Press and hold the TRIGGER. The laser will fire after a short delay

(about one-half of a second).

-or-

¶ Press the TRIGGER twice.

The 1st press turns on the in-scope aiming reticle. The 2nd press takes the measurement.

4. Continue to press the TRIGGER and keep the instrument sighted on the target:

¶ A low-pitched growl means that the instrument is attempting to lock

onto the target.

¶ 1 Low-Pitched and 2 High-Pitched Beeps mean that a measu rement

error occurred. An error code will be displayed (page 15).

¶ 2 high-pitched beeps mean that a speed was captured. The

measured speed will be displayed on the LCD screen and will be projected in the scope, just below the aiming reticle.

Page 17

After you release the TRIGGER, the instrument will display the most recent speed reading and the distance at which it was captured. The display screen will look similar to Figure #14. If you did not capture a speed, an error code will be displayed (page 15).

Choosing a Roadside Location

When choosing a spot on the side of the road for measuring moving vehicles, you will need to consider:

• Is the location safe?

• Do you have a clear lin e of sight?

• What is the approximate angle between the instrument's position and the target vehicle's direction of travel?

• What is the approximate distance to the target vehicles?

• How is the weather? Will you need to use the Weather Mode?

Page 20

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual Page 18

Line of Sight

Ideally, you should have a clear line of sight to the target vehicle.

If there is a momentary break in the beam,

• accumulate data and may be able to capture the target vehicle's speed. The instrument will display an error code if it cannot capture the target vehicle's speed.

If there is an extended break in the beam,

• error code.

the instrument will

the instrument will display an

The Cosine Effect

If the target vehicle is moving directly toward or away from you, the speed measured by the TruSpeed is identical to the vehicle's true speed. However, the instrument is usually set up on the side of the road for safety. This results in an angle between the instrument's position and the target vehicle's direction of travel. When the angle is significant, the measured speed is less than the target's true speed. The phenomenon is known as the cosine effect. Cosine is the trigonometric function that relates to this phenomenon.

The difference between the measured speed and the true speed depends upon the angle between the instrument's ideal position- the position where targets

would be moving in direct line with the instrument- and its actual position.

• The larger the angle, the lower the measured speed.

• The effect always works to the motorist’s advantage.

• Loosely speaking, the cosine effect is not significant as long as the angle remains small. The table below shows this effect.

Measured Speed by Angle: The Cosine Effect:

Angle

(degrees)

0 30.00 40.00 50.00 60.00 70.00 1 29.99 39.99 49.99 59.99 69.99 3 29.96 39.94 49.93 59.92 69.90

5 29.89 39.85 49.81 59.77 69.73 10 29.54 39.39 49.24 59.09 68.94 15 28.98 38.64 48.30 57.94 67.61 20 28.19 37.59 46.99 56.38 65.78 45 21.21 28.28 35.36 42.43 49.50 90 00.00 00.00 00.00 00.00 00.00

30 MPH 40 MPH 50 MPH 60 MPH 70 MPH

True Speed

Measured Speed (MPH)

Page 21

Section #2 - Speed Measurements

Page 19

The cosine effect decreases as the range to the target vehicle increases.

• At the maximum range of the instrument, the vehicle is so far away that the angle between it and the instrument is very small indeed. The instrument's perception of the target's speed is identical to its true speed.

• As the vehicle approaches, the angle increases until it becomes large enough to affect the measurement.

To minimize the cosine effect, keep the angle small. Set up the

instrument as close to the road as possible without creating safety risks, and target down the road at ranges sufficient to keep the angular difference small.

The table below shows acceptable parameters for minimizing the cosine effect. The chart indicates the percentage of true speed measured, given the distance from the roadway and the distance from the target vehicle. To find a target's measured speed, multiply the true speed by the number in the chart.

Distance

off the

roadway

(feet)

10 25 .9682

50 .8660 .9798 100 .0000 .9165 .9798 200 .0000 .6000 .9165 .9798

The diagonal created by the boldface numbers indicates the boundary between acceptable and unacceptable parameters.

•Numbers

Remember that the cosine effect is always in the motorist's favor.

As a general rule, do not exceed 10 f eet of f the r oad f or ev ery 100 f eet

shooting down range to the targets. If target vehicles will be 500 feet down the road, set up no more than 50 feet off the road.

100 ft 250 ft 500 ft 1000 ft 2000 ft

fraction of the True Speed that will be measured

.9950

above

the diagonal are acceptable margins of error.

below

the diagonal are unacceptable margins of error.

Range to Target Vehicle

.9992 .9998 .9999 1.0000

.9950

.9987 .9997 .9999

.9950

.9987 .9997

.9950

.9987

.9950

Page 22

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual

Figure #15

Page 20

Measuring a Moving Vehicle

1. Ensure that the TruSpeed is powered ON and that the Speed Mode is active.

2. Use the aiming reticle to aim the instrument at the target vehicle's license plate area and press the TRIGGER.

3. Continue to press the TRIGGER and keep the instrument sighted on the target

¶ A low-pitched growl means that the instrument is attempting to lock

onto the target.

¶ A low-pitched beep means that a measurement error occurred. An

error code will be displayed.

¶ A high-pitched double beep means that a speed was captured. The

measured speed will be projected in the scope just below the aiming reticle.

While the instrument is attempting to lock onto the target, as long as the TRIGGER is kept pressed, it will retry the speed measurement.

• In this mode, the instrument will attempt to lock onto the target for up to 5 seconds. Information is accumulated until it gets a good measurement or generates an error code.

• Consequently, it is very important that the aiming point on the target remain constant for the entire measurement time. If you move the instrument off the aiming point, it will gene r ate an err or code inst ead of capturing a speed reading.

After you release the TRIGGER the instrument will display the most recent speed reading and the distance at which it was captured or an error code. When the most recent speed reading is displayed, the display screen will look similar to Figure #15.

• The speed displays as a from you when it was measured.

• The speed displays as a you when it was measured.

negative number

positive number

if the target was going away

if the target was approaching

Page 23

Section #2 - Speed Measurements

Figure #16

Page 21

Using the Weather Mode

Moisture is reflective. Weather such as rain, snow, or fog can make it difficult for the laser to receive signals back from the target. This is especially true when you are trying to capture speeds at close range. The TruSpeed includes a built-in Weather Mode that is an alternate speed measurement mode. When the Weather Mode is active, the factory-defined gate setting increases the instrument's minimum range from 50 ft to 200 ft. Increasing the minimum range ensures that the laser only acquires targets beyond the range where we ather affects the laser's ability to capture a speed reading.

When the Weather Mode is active:

• The Weather Mode indicator appears in the lower left corner of the LCD Screen.

• Targets must be a distance greater than 200 feet.

• The instrument's maximum range is not changed.

• Other than the above items, the TruSpeed operates the same as when the Speed Mode is active and the Weather Mode is not active.

To activate the Weather Mode.

1. Ensure that the TruSpeed is powered ON.

2. Press the button. The display should look similar to Figure #16.

3. Aim the instrument at the target vehicle's license plate area and press the TRIGGER.

4. Continue to press the TRIGGER, and keep the instrument sighted on the target:

¶ A low-pitched growl means that the instrument is attempting to lock

onto the target.

¶ A low-pitched beep means that a measurement error occurred. An

error code will be displayed.

¶ A high-pitched double beep means that a speed was captured. The

measured speed will be projected in the scope just below the aiming reticle.

While the instrument is attempting to lock onto the target, as long as the TRIGGER is kept pressed, it will retry the speed measurement.

• In this mode, the instrument will try up to 5 seconds. Information is accumulated until it gets a good measurement or generates an error code.

• Consequently, it is very important that the aiming point on the target remain constant for the entire measurement time. If you move the instrument off the aiming point, it will generate an error code instead of capturing a speed reading.

Page 24

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual

Figure #17

Figure #18

Page 22

Using the Continuous Mode

Continuous Mode is an alternate speed measurement mode. If you wish to take several successive readings on a targe t, you can put the instrume nt in Continuous Mode. In this mode, the instrument takes and displays on e reading after another, and continues to take and display readings as long as you hold down the TRIGGER. Release the trigger, and the instrument finishes its latest reading and stops. If an error code is shown when you release the trigger, the instrument will display either the most recent speed reading, or, if the error code has persisted for several tries, the error code will remain.

When the Continuous Mode is active:

• The Continuous Mode indicator appears in the middle left side of the LCD Screen.

• For the best results, do not try to use Continuous Mode to target one vehicle after another.

• When you wish to change targets, release the trigger, aim to the new target, and retrigger.

To activate the Continuous Mode:

1. Ensure that the TruSpeed is powered ON.

2. Press the button. The display should look similar to Figure #18.

3. Aim the instrument at the target vehicle's license plate area and press the TRIGGER.

4. Continue to press the TRIGGER and keep the instrument sighted on the target:

¶ A low-pitched growl means that the instrument is attempting to lock

onto the target.

¶ A low-pitched beep means that a measurement error occurred. An

error code will be displayed.

¶ A high-pitched double beep means that a speed was captured. The

measured speed will be projected in the scope just below the aiming reticle.

Page 25

Section #2 - Speed Measurements

Figure #19

Page 23

While the instrument is attempting to lock onto the target, as long as the TRIGGER is kept pressed, it will retry the speed measurement.

• In this mode, the instrument will try up to 5 seconds. Information is accumulated until it gets a good measurement or generates an error code.

• Consequently, it is very important that the aiming point on the target remain constant for the entire measurement time. If you move the instrument off the aiming point, it will generate an error code instead of capturing a speed reading.

• The instrument will take and display one r eading after another as lon g as you hold down the TRIGGER.

Laser Jammer Detection

The L TI 20/20 TruSpeed contains advanced circuitry and algorithms that allow the instrument to determine if a laser jammer is bein g used. Th e JAM to ne (page 14) indicates that the instrument is being flooded by a light source. There are two possible situations:

• You are targeting a strong light source such as xenon headlights.

-or-

• A targeted vehicle is employing a laser jammer.

Regardless of the level of interference, you will never get an erroneous speed reading.

• If the laser jammer uses “smart” technology, you will hear the jam tone and the measured speed will flash.

• If the laser jammer does not use “smart” technology or if the interference is from a light source other than a laser jammer:

¶ At a low level of interference, you will hear the jam tone and a

speed may be captured or an E03 error code may be displayed.

¶ At a high level of interference, you will hear the jam tone and an

E07 error code will be displayed.

Page 26

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual

Figure #20

Page 24

Section #3 - Test Mode and Instrument Te sts

The Test Mode includes 6 options and allows you to verify the TruSpeed's mechanics. These options include:

• Display Integrity Test

• Scope Alignment Test

• Delta Distance Test

¶ Fixed Distance Test

•Self Test

• Model and Firmware Version Number Display

• Serial Number Display

Display Integrity Test

The Display Integrity Test allows you to verify that all display segments are operating. LTI suggests that you do this test periodically.

1. Ensure that the T ruSpeed is powered ON.

2. Press the button. The display should look like Figure #20.

3. Compare the instrument's display to Figure #20. If any segment fails to display, contact Laser Technology, Inc. to arrange for repair. See the inside front cover for LTI contact

information.

The display integrity is also tested each time the unit is powered ON.

However, the results are only briefly displayed before the results of the Self Test are displayed.

Page 27

Section #3 - Test Mode and Instrument Tests

Figure #21

Page 25

Scope Alignment Test

Scope alignment is set at the factory when the instrument is shipped. A heavy blow is the only reason that the scope might ever go out of alignment. LTI suggests that you do this test periodically.

The Scope Alignment Test uses sound to indicate when the scope is on-target.

1. Select a target. Choose a prominent target with well-defined horizontal and vertical edges. A telephone pole is an excellent choice.

¶ Recommended distance to target: 650 feet. ¶ The target's reflective qualities and distance should be such that you

can clearly hear a change in pitch of the test tone as you pan the instrument over the edges of the target.

¶ Make sure there is nothing behind the target that the instrument

might detect, so you know without a doubt that any change in pitch is due strictly to the target.

2. Ensure that the TruSpeed is powered ON.

3. Press the button two times to activate the Test Tone display screen. It should look like Figure #21.

4. Scan the target. Press and hold the TRIGGER while panning the instrument across the target. The tone changes pitch when the instrument acquires the target. The highest pitch - the on-target tone should occur when the in-scope aiming reticle is centered on the target. Scan the target both horizontally and vertically.

¶ If the frequency drops off at equal distances from the center of the

aiming reticle, the instrument needs no adjustment.

¶ Otherwise, contact Laser Technology, Inc. for assistance with

re-aligning the scope. See the inside front cover for LTI contact information.

When checking vertical alignment to a close target, be aware of the

offset between the center of the scope and the center of the transmit lens, which is 2 inches.

Page 28

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual Page 26

Instrument Confidence Checks

There are several ways to verif y the measurement accuracy of a Lidar instrument. You can verify it directly by measuring the speed of an object traveling at a known speed, but this is seldom practical. The nature of Lidar is such that it cannot be tricked by a vibrating object, such as a tuning fork, into displaying a velocity. For these reasons, LTI has designed the Fixed Distance Test and the Delta Distance Test. LTI suggests that you do one of these tests each time the instrument is taken on duty.

Theses tests verify the accuracy of the two key elements of Lidar speed measurement:

• Precise time measurements

• Ability to make mathematical calculations

When setting up an area for these tests, LTI recommends:

• Permanently installing the test area in a convenient location. The test area must establish a permanent, known distance between a shooting mark and a target (Fixed Distance Test) or between a shooting mark and two targets (Delta Distance Test).

• Using a metal tape to measure the distance; this will ensure that the measurement is accurate.

Other considerations:

• The shooting mark is where you stand to do the test, and can be an "X" painted on the pavement.

• A target can be any flat, permanent structure-a sign or wall, for example-painted with a bull's eye or other aiming point.

• The shooting mark and the target must form a straight line.

• The distance specified is horizontal distance. Horizontal distance is measured along a straight, level path from the shooting mark to the center of the aiming point.

• The manner in which you stand and hold the in strume nt both a f fect the test measurements. For exact readings, carefully hold the instrument so it is directly over the middle of the X.

Page 29

Section #3 - Test Mode and Instrument Tests

Figure #22

Fixed Distance Test

The Fixed Distance Test is not one of the options included in the Test

Mode. In order to perform the Fixed Distance Test, the Speed Mode must be active.

The Fixed Distance Test requires one target:

• LTI recommends that the target should be 175 feet from the shooting mark. See Figure #22. If there is not enough space available, that specific distance is not c rucial. H owever, the distance between the target and the shooting mark must be a multiple of 1 foot, not a fraction of a foot.

Page 27

1. Stand on the shooting mark.

2. Ensure the TruSpeed is powered ON and that the Speed Mode is active.

3. Aim at the target.

4. Press the TRIGGER.

5. Check the display. The speed reading should be zero. A reading of zero verifies the timing accuracy of the instrument and is identical in nature to an accurate velocity reading of a vehicle moving at any speed.

¶ The displayed distance should read from 174.5 to 175.5 feet if yo ur

fixed distance was 175 feet.

If you need assistance, contact Laser Technology, Inc. See the inside

front cover for LTI contact information.

Page 30

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual

Figure #23

Page 28

Delta Distance Test

The Delta Distance Test requires two targets. LTI recommends that the first target should be 150 feet from the shooting mark, and the second should be 175 feet from the mark. See Figure #23. If there is not enough space available, that specific distance is not crucial. However , the distance between the target and the shooting mark must be a multiple of 1 foot, not a fraction of a foot.

Refer to Figure #23 as a guide for positioning the targets and the shooting mark.

1. Install the farther target.

2. Measure 175 feet to the shooting mark and mark the shooting spot.

3. Measure from the shooting mark 150 feet to the second target.

4. Mark that spot and install that target.

Page 31

Section #3 - Test Mode and Instrument Tests

Page 29

T o conduct the test, r efer to the table below . Note that, for display purposes, each measurement is rounded to whole feet.

Action Results

1. Stand on the shooting mark.

2. Power ON the TruSpeed and press the button 3 times until the

message -d1- appears in the upper display.

3. Aim to the far target and press the TRIGGER.

4. Check the display. If necessary, you may repeat step #3.

5. Press the button. The message

-d2- appears in the upper display.

6. Aim to the near target and press the TRIGGER.

7. Check the display. If necessary, you may repeat step #6.

8. Press the button. The screen displays the simulated speed (50 MPH) ±1 MPH and the difference between the two distances (25 F) ±6 inches.

If the targets are shot in reverse order, the display is the same,

but the simulated speed appears as a negative number

If the difference is 25 feet, the displayed simulated speed should be 49, 50, or 51 MPH, and the distance should be 24.5, 25.0, or 25.5 feet.

If you need assistance, contact Laser Technology, Inc. See the inside

front cover for LTI contact information.

Page 32

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual

Figure #24

Figure #25

Figure #26

Figure #27

Page 30

Self Test

Just like when the instrument is powered ON, during the Self Test the microcontroller interrogates the system electronics.

To display the Self Test:

1. Press the button 4 times. Figure #24 shows the initial screen display.

2. Press the TRIGGER to complete the Self Test. Figure #25 shows an example of all tests proving positive.

¶ If all tests do not prove positive, the

appropriate error code will appear in the upper display (see page 15).

If the instrument fails the Self Test:

1. Press the Button to power OFF the TruSpeed.

2. Press the Button to once again power ON the TruSpeed and repeat the Self Test.

3. Contact LTI if the error repeats and you need assistance. See the inside front cover for LTI contact information.

Model and Firmware Version Number Display

To display the model number and firmware version number of your TruSpeed, press the button

5 times. The model number appears in the upper display and the firmware version number appears in the Lower Display. The display should look similar to Figure #26. In this example, the model number is “100” and the firmware version number is “1.00”.

Serial Number Display

To display the serial number of your TruSpeed, press the button 6 times. The serial number has 6

digits and appears in the upper and lower display. The display should look similar to Figure #27. In this example, the serial number is “000001”.

Page 33

Section #4 - Maintenance

Page 31

Section #4 - Maintenance

Operating Temperature

The instrument is rated for a temperature range of -22° F to +140° F. Do not operate the instrument in temperatures outside that range.

Moisture and Dust Protection

The TruSpeed is sealed to provide protection from normally encountered field conditions. It is protected from dust and light moisture.

Shock Protection

The TruSpeed is a precision instrument and should be handled with care. It will withstand a reasonable drop shock. If you drop the instrument, check the scope alignment (page 25) before using the instrument for speed measurement.

Cleaning and Storage

Clean the instrument after each use. Check for the following:

Excess moisture.

• room temperature.

Exterior dirt.

• remove dirt and fingerprints from the scope exterior.

Dirty lenses.

• from the front panel lenses. To clean a lens, moisten it with lens cleaning solution and wipe it with a clean cloth or lens tissue.

Batteries.

• batteries before storing it.

Caring for the Scope

Do not attempt to lubricate the scope. It is sealed from within using o-rings and special compounds. All seals are permanent and require no maintenance.

Use a lens brush to remove surface dust and loose particles. To clean a lens, moisten it with lens cleaning solution and wipe it with a clean cloth or lens tissue.

Checking the Screen Display

The instrument provides a method of verifying the display integrity. For more information, see page 24.

Restoring Factory Default Settings

See page 13.

T o wel off ex cess moistur e and air dry the in strument at

Wipe exterior surfaces clean. Use isopropyl alcohol to

Use a lens brush to remove su rface dust and loose particles

If you won't be using the instrument again soon, remove the

Page 34

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual Page 32

Section #5 - Specifications

Weight: 2.75 lb. (with batteries) Size: 7.75 x 3 x 11.75 in. Acquisition Time: 0.33 sec Speed Accuracy: ±1 mph Minimum Range:

Speed Mode: 50 feet Weather Mode: 200 feet

Continuous Mode; 50 feet Maximum Range: 2,000 feet Speed Measurement Range: ±200 mph Range Accuracy: ±6 inches Range Resolution: 1 foot Beam Divergence: 2.5 milliradians nominal Laser Wavelength: 905 nanometers nominal Temperature Range: -22° F to +140° F Power: Two alkaline, NiCad, or NiMH rechargeable

C-cell batteries providing up to 25 hours of

cordless operation. Eye Safety: FDA Class 1 (CFR 21) Environment: Water resistant

NEMA 4 and IP 55 Construction: Composite Polycarbonate Outer Shell

Aluminum Internal Chassis

Page 35

Section #6 - Troubleshooting Tips

What You Will See Required Action

Unit powers OFF by itself.

-orNo power at all.

The in-scope aiming reticle is not visible.

E01 error code. No range or speed readings.

Erroneous readings/not repeatable.

Limited Range. • Do you have a clear line of sigh t?

Difficult to acquire target while aiming through windshield.

Difficult to acquire target while aiming through rain or snow.

• Verify that the batteries are installed correctly.

• Replace the batteries.

• Keep in mind that the instrument automatically powers OFF if there is no instrument activity for a period of 15 minutes.

• Press the TRIGGER to activate the aiming reticle.

• Press the button to increase the intensity of the aiming reticle.

• Adjust the polari zing filter.

• Can you measure to a wall that is about 50 feet away?

• Check the scope alignment.

• Restore the factory defaults.

• When measuring a short range to a small target, aim slightly above the target.

• Do you have a clear line of si ght?

• Check the scope alignment.

• Is it raining or foggy. If yes, is the W eat her Mode active? If not, turn it ON. Keep in mind that the minimum range will be 200 feet.

• When measuring a short range to a small target, aim slightly above the target.

• Rain or fog will reduce the unit’s maximum range.

• Is the Weather Mode active? If not, turn it ON. Keep in mind that the mini mum range will be 200 feet.

• Keep in mind that acquiring a target through glass will reduce the unit’s maximum range.

• Make sure the lens is clean.

• Check the lens for scratches.

• Is the Weather Mode active? If not, turn it ON. Keep in mind that the mini mum range will be 200 feet.

• If the windshield is bubble-shaped, shoot through the center of the windshield .

• • Is the Weather Mode active? If not, turn it ON. If not, turn it ON. Keep in mind that the minimum range will be 200 feet.

Section #6 - Troubleshooting Tips

Page 33

Page 36

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual Page 34

Section #7 - Glossary

beam divergence: The tendency of a laser beam to expand in

diameter as it moves away from the source, measured in milliradians (mrad).

Continuous Mode: Alternate speed measurement mode. Allows you

to take several successive readings of a target vehicle. Re-trigger for each new target. See page 22.

Delta Distance Test: Uses two measurements each to a known

distance to verify the measurement accuracy of the TruSpeed. See page 28.

Display Integrity Test: Allows you to verify that all segments of the LCD

screen are operating. See page 24.

Fixed Distance Test: Uses one measurement to a known distance to

verify the measurement accuracy of the TruSpeed. See page 27.

laser:

lidar: A device that is similar in operation to radar, but

microcontroller: The computer processor that controls all of the

Receive Lens: Located on the front panel of the TruSpeed, it is

reticle: A scale located in the sighting scope that helps

Transmit Lens: Located on the front panel of the TruSpeed, it is

Weather Mode: Alternate speed measurement mode. The laser

Light Amplification by Stimulated Emission of

Radiation.

emits pulsed laser light instead of radio waves.

functions of the TruSpeed.

the bottom lens and receives the signals back from the target and then feeds the signal information to the microcontroller.

you aim to your target. It is visible when the TruSpeed is powered ON. You m a y need to press the TRIGGER to see the reticle. See page 5.

the top lens and transmits the infrared laser signals.

only acquires targets that are beyond the range where weather affects the laser’s ability to capture a speed reading. Targets must be at a distance greater than 200 feet. See page 21.

Page 37

Index

Page 35

Index

accessories 3 acquisition time 32 adjustment ring

filter 5

aiming reticle 5

brightness 13 not visible 33

Backlight button 6 bAtt CHAng 12 batteries

inserting 8

Battery

display indicator 9, 11

battery

voltage level

Battery Release 4, 8 Battery Tube 4, 8 beam divergence 32, 34 beeps 14 br xx 12 brightness

of the aiming reticle 13 Brightness Control button 6 buttons 6

cleaning 31 confidence checks 26 construction 32 Continuous Mode 22, 34

display indicator 11 Continuous Mode button 6 cosine effect 18

minimizing 19

-d1- 12, 29

-d2- 12, 29 dEF CLEAr 12, 13 Delta Distance Test 28, 34 Delta Distance Text

results 29

Display Backlight

display indicator 11 display indicators 11 Display Integrity Test 24, 34 drop shock 31 dust protection 31

E xx 12 environment 32 error codes 15 error conditions 14 eye safety 3, 32

filter 5 filter adjustment ring 5 firmware version number 30 Fixed Distance Test 27, 34 front panel 4

Handle / Battery Compartment 4

Keypad 4

Page 38

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual Page 36

laser 34 Laser Fire

display indicator 11 laser jammer detection 23 laser wavelength 32 LCD Screen 4, 5 LCD screen 11 lenses 5 lidar 34 limited range 33 line of sight 18 Lower Display

LCD display

maximum range 32 measured speed 18 microcontroller 34 minimum range 32

Weather Mode 21 moisture protection 31

negative value

speed display 20 no power 33

panels

front and rear 4 PASS 12 polarizing light filter 5 positive value

speed dispaly 20 power 32 power OFF interval 10 Power ON/OFF button 6 powering

OFF

ON 10

range 32

accuracy and resolution 32 Range Units

display indicator 11 rear panel 4 Receive Lens 4, 5, 34 restore factory defaults

factory defaults

how to restore 13

reticle 5, 34 RFI considerations 15 roadside location

how to choose

OFF 10 ON 10 operating temperature 3, 31

Page 39

Index

Page 37

safety 3 scope

caring for 31 Scope Alignment Test 25 SELF 12 Self Test 30 serial number display 30 shock protection 31 Shoulder Stock 7 Shoulder Stock Attachment Point 4 Shoulder Stock Release 4 Sighting Scope 4 sighting scope 5 size 32 SN 12 sounds 14 Speaker 4 specifications 32 speed accuracy 32 speed measurements

Continuous Mode 22

how to take 17

LCD screeen 16

moving vehicle 20

negative vlaue 20

range 32

Weather Mode 21 Speed Mode 16 Speed Mode button 6 Speed Units

display indicator 11 storage 31

temperature range 3, 32 Test Mode 24

display indicator 11 Test Mode button 6 Test Port 4, 5 test tone 25 tones 14 Transmit Lens 4, 5, 34 TRIGGER 4 troubleshooting tips 33 true speed

percentage measured 19 tt 12

Unit powers OFF 33 Upper Display

LCD display 11

views

of the TruSpeed 4

Weather Mode 21, 34

display indicator 11 Weather Mode button 6 weight 32 windshield

aiming through

Page 40

Laser Technology, Inc. LTI 20/20 TruSpeed User’s Manual Page 38

NOTES: