Topcon DT-300 Series User manual

INSTRUCTION MANUAL
DIGITAL THEODOLITE
DT-300 series
1037074-02-B
COVER

i
HOW TO READ THIS MANUAL
Thank you for selecting the TOPCON instrument.
• Please read this Instruction manual carefully, before using this product.
• The specifications and general appearance of the instrument are subject to change without prior notice and
without obligation by TOPCON CORPORATION and may differ from those appearing in this manual.
• The content of this manual is subject to change without notice.
• Some of the diagrams shown in this manual may be simplified for easier understanding.
• Always keep this manual in a convenient location and read it when necessary.
• This manual is protected by copyright and all rights are reserved by TOPCON CORPORATION.
• Except as permitted by Copyright law, this manual may not be copied, and no part of this manual may be
reproduced in any form or by any means.
• This manual may not be modified, adapted or otherwise used for the production of derivative works.
Symbols
The following conventions are used in this manual.
: Indicates precautions and important items which should be read before operations.
: Indicates the chapter title to refer to for additional information.
: Indicates supplementary explanation.
{HOLD} etc. : Indicates keys on the operation panel.
Notes regarding manual style
• Except where stated, “DT” means DT-302/305/307/305L/307L/309F/309G/309LG in this manual.
• All other company and product names featured in this manual are trademarks or registered trademarks of
each respective organization.
This is the mark of the Japan Surveying Instruments Manufacturers Association.

ii
CONTENTS
1. PRECAUTIONS FOR SAFE OPERATION ................................................................... 1
2. PRECAUTIONS ............................................................................................................. 3
3. LASER SAFETY INFORMATION .................................................................................. 5
4. PRODUCT OUTLINE .................................................................................................... 6
4.1 Parts of the Instrument ......................................................................................... 6
5. BASIC OPERATION ...................................................................................................... 9
5.1 Basic Key Operation ............................................................................................. 9
5.2 Display Functions ................................................................................................. 9
6. USING THE BATTERY ............................................................................................... 11
6.1 Installing the AA Batteries .................................................................................. 11
6.2 Installing the Battery (DB-80) ............................................................................. 11
7. SETTING UP THE INSTRUMENT .............................................................................. 13
7.1 Centering ............................................................................................................ 13
7.2 Levelling ............................................................................................................. 14
7.3 Vertical Angle Tilt Correction .............................................................................. 15
8. POWER ON/OFF ........................................................................................................ 16
9. ANGLE MEASUREMENT ........................................................................................... 17
9.1 Measuring the Horizontal Angle Right and Vertical Angle .................................. 17
9.2 Switching Horizontal Angle Right/Left ................................................................ 17
9.3 Measuring from the Required Horizontal Angle .................................................. 18
9.4 Vertical Angle % Display .................................................................................... 18
9.5 Repetition Angle Measurement .......................................................................... 19
9.6 Stadia Surveying ................................................................................................ 20
10. HOW TO OPERATE THE LASER POINTER .............................................................. 21
10.1 Using the Laser-pointer Function ....................................................................... 21
11. OTHER FUNCTIONS .................................................................................................. 22
11.1 Buzzer for Horizontal Angle 90° Increments ...................................................... 22
11.2 Compasses (vertical angle) ................................................................................ 22
11.3 Power-saving Automatic Cut-off ......................................................................... 22
11.4 Setting Minimum Display .................................................................................... 22
12. SELECTING MODE .................................................................................................... 23
12.1 Selecting Mode Options ..................................................................................... 23
12.2 How to Set the Selecting Modes ........................................................................ 25
12.3 Initialization of Selecting Mode ........................................................................... 27
13. CHECKS AND ADJUSTMENTS ................................................................................. 28
13.1 Plate Level .......................................................................................................... 28
13.2 Circular Level ...................................................................................................... 29
13.3 Vertical Cross-hair .............................................................................................. 30
13.4 Collimation .......................................................................................................... 31
13.5 Optical Plummet ................................................................................................. 32
13.6 Vertical Angle 0 Datum ....................................................................................... 34
13.7 Laser Beam ........................................................................................................ 35
14. OPTIONAL ACCESSORIES ....................................................................................... 36
15. ERROR DISPLAY ....................................................................................................... 37
16. SPECIFICATIONS ....................................................................................................... 38
17. REGULATIONS .......................................................................................................... 41

1
1. PRECAUTIONS FOR SAFE OPERATION
For the safe use of the product and prevention of injury to operators and other persons as well as prevention
of property damage, items which should be observed are indicated by an exclamation point within a triangle
used with WARNING and CAUTION statements in this instruction manual.
The definitions of the indications are listed below. Be sure you understand them before reading the manual’s
main text.
Definition of Indication
General
WARNING Ignoring this indication and making an operation error could possibly result
in death or serious injury to the operator.
CAUTION Ignoring this indication and making an operation error could possibly result
in personal injury or property damage.
This symbol indicates items for which caution (hazard warnings inclusive) is urged. Specific
details are printed in or near the symbol.
This symbol indicates items which are prohibited. Specific details are printed in or near the
symbol.
This symbol indicates items which must always be performed. Specific details are printed in
or near the symbol.
Warning
Do not use the unit in areas exposed to high amounts of dust or ash, in areas where there is
inadequate ventilation, or near combustible materials. An explosion could occur.
Do not perform disassembly or rebuilding. Fire, electric shock, burns or hazardous radiation
exposure could result.
Never look at the sun through the telescope. Loss of eyesight could result.
Do not look at reflected sunlight from a prism or other reflecting object through the telescope.
Loss of eyesight could result.
When securing the instrument in the carrying case make sure to set all the locks. Failure to
do so could result in the instrument falling out while being carried, causing injury.
Caution
Do not use the carrying case as a footstool. The case is slippery and unstable so a person
could slip and fall off it.
Do not place the instrument in a damaged case or in a case with a damaged belt. The case
or instrument could be dropped and cause injury.
Do not wield or throw the plumb bob. A person could be injured if struck.
Secure handle to main unit. Failure to properly secure the handle could result in the unit
falling off while being carried, causing injury.
Tighten the adjustment tribrach clamp securely. Failure to properly secure the clamp could
result in the tribrach falling off while being carried, causing injury.

2
1. PRECAUTIONS FOR SAFE OPERATION
Power Supply
Tripod
Warning
Do not disassemble or rebuild the battery or the battery charger, nor expose to heavy shocks
or vibration. Sparking, fire, electric shock or burns could result.
Do not short circuit. Heat or ignition could result.
Do not place articles such as clothing on the battery charger while charging batteries. Sparks
could be induced, leading to fire.
Do not use voltage other than the specified power supply voltage. Fire or electrical shock
could result.
Do not use batteries other than those designated. An explosion could occur, or abnormal
heat generated, leading to fire.
Do not use damaged power cords, plugs or loose outlets. Fire or electric shock could result.
Do not use power cords other than those designated. Fire could result.
Use only the specified battery charger to recharge batteries. Other chargers may be of
different voltage rating or polarity, causing sparking which could lead to fire or burns.
Do not use the battery or charger for any other equipment or purpose. Fire or burns caused
by ignition could result.
Do not heat or throw batteries or chargers into fire. An explosion could occur, resulting in
injury.
To prevent shorting of the battery in storage, apply insulating tape or equivalent to the
terminals. Otherwise shorting could occur, resulting in fire or burns.
Do not use the battery or the battery charger if its terminals are wet. Resultant poor contact
or shorting could lead to fire or burns.
Do not connect or disconnect power supply plugs with wet hands. Electric shock could
result.
Caution
Do not touch liquid leaking from batteries. Harmful chemicals could cause burns or blisters.
Caution
When mounting the instrument to the tripod, tighten the centering screw securely. Failure to
tighten the screw properly could result in the instrument falling off the tripod, causing injury.
Tighten securely the leg fixing screws of the tripod on which the instrument is mounted.
Failure to tighten the screws could result in the tripod collapsing, causing injury.
Do not carry the tripod with the tripod shoes pointed at other persons. A person could be
injured if struck by the tripod shoes.
Keep hands and feet away from the tripod shoes when fixing the tripod in the ground. A hand
or foot stab wound could result.
Tighten the leg fixing screws securely before carrying the tripod. Failure to tighten the
screws could lead to the tripod legs extending, causing injury.

3
2. PRECAUTIONS
Precautions concerning water and dust resistance
The instrument conforms to IP66 specifications for waterproofing and dust resistance when battery cover and
connector cap are closed.
• Be sure to correctly attach the battery cover to protect the instrument from moisture and dust particles.
• Make sure that moisture or dust particles do not come in contact with the terminal or connectors. Operating
the instrument with moisture or dust on the terminal or connectors may cause damage to the instrument.
• Make sure that the inside of the carrying case and the instrument are dry before closing the case. If moisture
is trapped inside the case, it may cause the instrument to rust.
• If there is a crack or deformation in the rubber packing for the battery cover, stop using and replace the
packing.
• To retain the waterproof property, it is recommended that you replace the rubber packing once every two
years. To replace the packing, contact your local dealer.
Telescope
• Aiming the telescope at the sun will cause internal damage to the instrument.
Handle
• The handle of the instrument can be removed. When operating the instrument with the handle attached,
always make sure that the handle is securely fixed to the instrument body with the handle locks.
Tribrach Clamp (Detachable tribrach only)
• When the instrument is shipped, the tribrach clamp is held firmly in place
with a securing screw to prevent the instrument from shifting on the tribrach.
Before using the instrument the first time, loosen this screw with a precision
screwdriver. And before transporting it, tighten the securing screw to fasten
the tribrach clamp in place so that it will not shift on the tribrach.
Tribrach
• Always use the tribrach provided.
• If the tribrach is installed incorrectly, the measuring precision could be effected. Occasionally check the
adjusting screws on the tribrach. Make sure the tribrach clamp is locked and the securing screws are
tightened.
Other precautions
• Confirm battery level remaining before operating.
• Consult your local dealer before using the instrument under special conditions such as long periods of
continuous use or high levels of humidity. In general, special conditions are treated as being outside the
scope of the product warranty.
• When a high degree of precision is required for measurement, provide shade against direct sunlight for the
instrument and tripod.
• Remove batteries from the instrument before putting into storage after not using it for long periods. Leaving
the batteries attached for extended period of time can result in liquid leaking from batteries, which may lead
to malfunctioning.
• Always carry the instrument by its handle.
• When transporting the instrument, provide some protection to minimize risk of shocks. Heavy shocks may
cause the measurement to be faulty.
• When mounting the instrument on a tripod, use a wooden tripod when possible. The vibrations that may
occur when using a metallic tripod can effect the measuring precision. Tighten securely the leg fixing screws
of the tripod on which the instrument is mounted.
• When using high output transceiver etc., make sure it does not come near the instrument.

4
2. PRECAUTIONS
Maintenance
• Wipe off moisture completely if the instrument gets wet during survey work.
• Always clean the instrument before returning it to the case. The lens requires special care. First, dust it off
with the lens brush to remove tiny particles. Then, after providing a little condensation by breathing on the
lens, wipe it with the wiping cloth.
• To remove the dust on the case, never use thinner or benzine. Use a clean cloth moistened with neutral
detergent.
• When returning the instrument to its case, be sure to match the white positioning marks provided with the
case and place the instrument.
• Check the tripod for loose fit and loose screws.
User
• This product is for professional use only!
The user is required to be a qualified surveyor or have a good knowledge of surveying, in order to understand
the user and safety instructions, before operating, inspecting or adjusting.
• Wear the required protectors (safety shoes, helmet, etc.) when operating.
Exporting this product (Relating EAR)
• This product contains software/technology, which are subject to the EAR (Export Administration
Regulations). Depending on countries you wish to export or bring the product to, a US export license may be
required. In such a case, it is your responsibility to obtain the license. The countries requiring the license as
of Mar. 2020 are shown below. Please consult the Export Administration Regulations as they are subject to
change.
North Korea
Iran
Syria
Sudan
Cuba
URL for the EAR of the US: http://www.bis.doc.gov/policiesandregulations/ear/index.htm
Exceptions from Responsibility
• The manufacturer, or its representatives, assumes no responsibility for any damage, or loss of profits
(change of data, loss of data, loss of profits, an interruption of business etc.) caused by use of the product
or an unusable product.
• The manufacturer, or its representatives, assumes no responsibility for any damage, or loss of profits caused
by usage different to that explained in this manual.
• The manufacturer, or its representatives, assumes no responsibility for consequential damage, or loss of
profits due to heavy rain, strong wind, high-temperature and humidity, or storing or use of the product under
unusual conditions.
• Product failures caused by rebuilding are out of warranty.
• Cautions and warnings included in this manual do not cover all the possible events.

5
3. LASER SAFETY INFORMATION
The instrument *1 is classified as the following class of Laser Product according to IEC Standard Publication
60825-1 Ed.3.0: 2014 and United States Government Code of Federal Regulation FDA CDRH 21CFR Part
1040.10 and 1040.11 (Complies with FDA performance standards for laser products except for deviations
pursuant to Laser Notice No.56, dated May 8, 2019.)
*1: DT-305L/307L/309LG
Warning
• Use of controls or adjustments or performance of procedures other than those specified herein may result in
hazardous radiation exposure.
• Never intentionally point the laser beam at another person. The laser beam is injurious to the eyes and skin.
If an eye injury is caused by exposure to the laser beam, seek immediate medical attention from a licensed
ophthalmologist.
• The laser beam is emitted when the power is turned ON. Before turning the power on, make sure that
persons are not located in the path of the laser beam.
• Do not look directly into the laser beam. Doing so could cause permanent eye damage.
• Do not stare at the laser beam. Doing so could cause permanent eye damage.
• Aiming the instrument into prism or highly reflective surface can result in serious damage to your eye
because the optical axis and laser beam source is in coincidence. Do not aim the instrument directly into
prism or highly reflective surface. Do not look at the laser beam directly.
Caution
• Perform checks at start of work and periodic checks and adjustments with the laser beam emitted under
normal conditions.
• When the instrument is not being used, turn off the power and replace the lens cap.
• When disposing of the instrument, destroy the battery connector so that the laser beam cannot be emitted.
• Avoid setting the instrument at heights at which the path of the laser may strike pedestrians or drivers at head
height. Operate the instrument with due caution to avoid injuries that may be caused by the laser beam
unintentionally striking a person in the eye.
• Do not emit the laserbeam at eye level.
• Never point the laser beam at mirrors, windows or surfaces that are highly reflective. The reflected laser
beam could cause serious injury
• When using the laser-pointer function, be sure to turn OFF the output laser after measurement is completed.
Even if the power is turned off, the laser-pointer function is still operating and the laser beam continues to be
emitted.
Device Laser class
Laser-pointer Class 2
࣮ࣞࢨගࡢฟཱྀ
AVOID EXPOSURE-Laser radiation
is emitted from this aperture.
Laser beam
emitted
from here

6
4. PRODUCT OUTLINE
DT-302/305/307/309F/309G
1 Handle
2 Handgrip locking screw
3 Sighting collimator
4 Instrument height mark 
5 Battery cover
6 Serial connector (DT-302 only)
7 Circular level
8 Leveling foot screw
9 Display unit*1
10 Optical plummet
11 Objective lens (Includes "Laser-pointer function")
12 Telescope focusing ring
13 Cross-hair adjustment section cover
14 Vertical clamp
15 Vertical fine motion screw
16 Operation keys
17 Horizontal fine motion screw
18 Horizontal clamp
19 Tribrach*2
20 Tribrach clamp (DT-302/305/307 only)
21 Plate level
22 Telescope eyepiece (Diopter ring)
23 Centering fixing screw (DT-309F only)
*1 DT-309F/309G has one side display only.
*2 Tribrach type
DT-302/305/307: Detachable
DT-309G: Fixing
DT-309F: Centering
4.1 Parts of the Instrument
1
2
3
4
5
7
8
9
10
6
11
15
16
17
18
12
13
14
19
20
21
22
23

7
4. PRODUCT OUTLINE
DT-305L/307L/309LG
1 Handle
2 Handgrip locking screw
3 Sighting collimator
4 Instrument height mark 
5 Battery cover
6 Circular level
7 Leveling foot screw
8 Display unit*1
9 Optical plummet
10 Objective lens (Includes "Laser-pointer function")
11 Telescope focusing ring
12 Cross-hair adjustment section cover
13 Vertical clamp
14 Vertical fine motion screw
15 Operation keys
16 Horizontal fine motion screw
17 Horizontal clamp
18 Tribrach*2
19 Tribrach clamp (DT-305L/307L only)
20 Plate level
21 Laser axis adjusting screw (with cap)
22 Telescope eyepiece (Diopter ring)
*1 DT-309LG has one side display only.
*2 Tribrach type
DT-305L/307L: Detachable
DT-309LG: Fixing
Instrument height mark
The height of the instrument is as follows:
• 177mm (from tribrach mounting surface to this mark)
• 222mm +5/-3mm
Tribrach type: Detachable (from tribrach TR-103R plate to this mark)
Tribrach type: Centering (from tribrach plate to this mark)
Laser-pointer function
A target can be sighted with a red laser beam in dark locations without the use of the telescope.
10
1
2
3
4
5
6
7
8
9
14
15
16
17
11
12
13
18
19
20
21
22

8
4. PRODUCT OUTLINE
Sighting collimator
Use sighting collimator to aim the instrument in the direction of the measurement point.
Turn the instrument until the apex of the triangle in the sighting collimator is aligned with the target. A circle
surrounds the triangle to make it easier to locate.
Detaching/attaching the Handle
The carrying handle can be removed from the instrument when the prism is located at the zenith etc.
1. To remove it, loosen the handle rocking screws.
2. To attach the handle, position the handle as shown, tighten the 2 handle rocking screws securely.
Detaching the instrument from the tribrach (Detachable tribrach type only)
1. Turn the tribrach clamp counterclockwise to
loosen.
2. Lift the instrument to detach.
Attaching the instrument to the tribrach (Detachable tribrach type only)
1. Align (1) and (2) and lower the instrument onto the
tribrach.
2. Turn the tribrach clamp clockwise to tighten.
Serial Signal RS-232C Connector
(DT-302 only)
Serial signal connector is used for connecting the DT-302 with a computer, which enables the computer to
receive measurement data from the DT-302.

• Contact your local dealer regarding interface cables and output formats used when connecting to a
computer.
Handle rocking screws
Handle
(1)
(2)

9
5. BASIC OPERATION
Learn basic key operations here before you read each measurement procedure.
Learn basic key operations here before you read the measurement procedure.
Adjustment mode and Selecting mode
Display marks
5.1 Basic Key Operation
Key Function Key Function (Function mode)
{}Power switch {REP} Repetition angle measurement
{FUNC} Upper function selection {}
Illumination of display and reticle
ON/OFF
{R/L} Selection for horizontal angle right/left
measurement {}
Moving the blinking digit to the left
{V/%} Vertical angle display
Selection for vertical angle/percent display {}
Moving the blinking digit to the right
{HOLD} Holding the horizontal angle {} Increment the blinking numeral
{0 SET} Horizontal angle 0° set
Mode Key
Adjustment mode of vertical angle 0 datum Turn the power ON while pressing {0 SET}.
Selecting mode 1 Turn the power ON while pressing {R/L}.
Selecting mode 2 Turn the power ON while pressing {V/%}.
5.2 Display Functions
Display Contents Display Contents
VVertical angle TILT Tilt correction mode
(DT-302/305/305L/307/307L only)
HR Horizontal angle right FFunction key selection mode
HL Horizontal angle left %Percent grade
Ht Repetition angle measurement GUnit display GON
8AVG The number of repetition/
Average of angle
Function mode

10
5. BASIC OPERATION
Remaining Battery Power
The remaining battery power is displayed in four levels.

• The battery operating time will vary depending on the environmental conditions, such as ambient
temperature etc. Prepare spare batteries in advance to minimize disruption to measurement.
"6. USING THE BATTERY"
Display of version number and angle measurement accuracy
Press {FUNC} to enter Function Mode, and then press {0 SET} to display the version number. In Version
Display Mode, the software version information on the top line and the angle measurement accuracy
information on the second line are displayed.
Measurement is possible.
Measurement is impossible.
Replace batteries.
Remaining battery power
V 90°10’20”
TILT
HR 123°40’50”
{FUNC}
V 90°10’20”
HR 120°30’40”
V 90°10’20”
HR 120°30’40”
1.00 00
CLASS 5”
{0 SET}
After these settings are displayed for three seconds, the screen
automatically returns to the previous screen.

11
6. USING THE BATTERY
The following batteries can be used with the DT.
• Four AA alkaline batteries (sold separately)
• Battery BDC71 ("14. OPTIONAL ACCESSORIES")

• Replace all four batteries with new ones at the same time.
• Do not mix the old batteries to the new ones.
PROCEDURE
1. Remove the battery holder (DB-80) cover by
sliding it upward.
2. Insert the two AA alkaline batteries according to
the +/- indicators on the battery holder.
3. Close the battery holder cover.
4. Similarly, slide the cover on the opposite side and
insert the two AA alkaline batteries.
5. Close the battery holder cover.
1. Slide the catch on the battery cover to open.
6.1 Installing the AA Batteries
6.2 Installing the Battery (DB-80)
Battery cover

12
6. USING THE BATTERY
2. Checking the terminal side on the battery, insert
the battery as shown.

• Do not insert the battery inclined. Doing so may
damage the instrument or battery terminals.
3. Close the battery cover. A click is heard when the
cover is secure.
Battery

13
7. SETTING UP THE INSTRUMENT

• Mount the battery in the instrument before performing this operation because the instrument will tilt slightly
if the battery is mounted after levelling.
PROCEDURE Centering with the optical plummet eyepiece
1. Make sure the legs are spaced at equal intervals
and the head is approximately level.
Set the tripod so that the head is positioned over
the survey point.
Make sure the tripod shoes are firmly fixed in the
ground.
2. Place the instrument on the tripod head.
Supporting it with one hand, tighten the centering
screw on the bottom of the unit to make sure it is
secured to the tripod.
3. Looking through the optical plummet eyepiece, turn
the optical plummet eyepiece to focus on the
reticle.
Turn the optical plummet focusing ring to focus on
the survey point.
4. Adjust the levelling foot screws to center the
survey point in the optical plummet reticle.
5. Continue to the levelling procedure.
"7.2 Levelling"
7.1 Centering
Centering screw
Focusing on the survey point
Focusing on the
reticle
Levelling foot screws

14
7. SETTING UP THE INSTRUMENT
PROCEDURE
1. Perform the centering procedure.
"7.1 Centering"
2. Roughly center the bubble in the circular level by
either shortening the tripod leg closest to the
offcenter direction of the bubble or by lengthening
the tripod leg farthest from the offcenter direction of
the bubble. Adjust one more tripod leg to center the
bubble.
3. Turn the upper part of the instrument until the plate
level is parallel to a line between levelling foot
screws A and B.
Center the air bubble using levelling foot screws A
and B simultaneously.
The bubble moves towards a clockwise rotated
levelling foot screw.
4. Turn the upper part of the instrument though 90°.
The plate level is now perpendicular to a line
between levelling foot screws A and B.
Center the air bubble using levelling foot screw C.
5. Turn another 90° and check bubble position.
Turn the upper part of the instrument a further 90°
and check to see if the bubble is still in the center of
the plate level. If the bubble is offcenter, perform
the following:
a. Turn levelling foot screws A and B equally in
opposite directions to remove half of the bubble
displacement.
b. Turn the upper part a further 90°, and use
levelling foot screw C to remove half of the
displacement in this direction.
Or adjust the plate level.
"13.1 Plate Level"
6. Turn the instrument and check to see if the air
bubble is in the center position in all directions.
If it is not, repeat the levelling procedure.
7.2 Levelling
Tripod legs
adjustment

15
7. SETTING UP THE INSTRUMENT
7. Adjust the leveling screw again to align the survey
point with the center of the optical vertical reticle.
(Tribrach type: Detachable)
Loosen the centering screw slightly.
Looking through the optical plummet eyepiece,
slide the instrument over the tripod head until the
survey point is exactly centered in the reticle.
Retighten the centering screw securely.
(Tribrach type: Centering)
Loosen the centering fixing screw slightly.
Looking through the optical plummet eyepiece,
slide the instrument over the tripod head until the
survey point is exactly centered in the reticle.
(The instrument is moved horizontally within a
range of ± 8mm.)
8. Check again to make sure the bubble in the plate
level is centered.
If not, repeat the procedure starting from step 3.
(DT-302/305/305L/307/307L only)
When the tilt sensor is activated, automatic correction of vertical angle for mislevelment is displayed. To ensure
a precise angle measurement, tilt sensors must be turned on. If the "b" display appears the instrument is out
of automatic compensation range and must be leveled manually.
In case the instrument is used in an unstable situation, constant indexing of vertical angle may be impossible.
In this case, the function of tilt correction can be stopped.
To stop the function of tilt correction, refer to "12. SELECTING MODE".
7.3 Vertical Angle Tilt Correction
Out of the tilt
correction
range
V 90°10’20”
TILT
HR 123°40’50”
V b
TILT
HR 123°40’50”

16
8. POWER ON/OFF
PROCEDURE Power ON
1. Press the power switch key on the operation panel.
Every segment turns on for about 1 second, and then the
horizontal angle is displayed.
Press {V/%}.
The vertical angle is displayed.

• Confirm the battery power remaining on the display.
Replace with charged battery or charge when battery level
is low.
"■Remaining Battery Power"
PROCEDURE Power OFF
1. Press the power switch key on the operation panel.
CAUTION
• When using the laser-pointer function, be sure to turn OFF the output laser after measurement is completed.
Even if the power is turned off, the laser-pointer function is still operating and the laser beam continues to be
emitted.
HR 342°03’00”
V 11°50’00”
HR 342°03’00”
Remaining battery power

17
9. ANGLE MEASUREMENT
1. Sight the first target "A".
2. Press {0 SET} twice to set the horizontal angle of target "A" to
"0°00’00".

• Horizontal angle can be set to 0 with one press of {0 SET}.
"12. SELECTING MODE"
3. Sight the second target "B".
The required H/V angle to target B will be displayed.
1. Sight the first target “A”.
2. Press {R/L}.
The mode switches from Horizontal angle right (HR) to
Horizontal angle left (HL).
HR/HL mode switches every time {R/L} is pressed.
3. Measure as HR mode.
Sighting
1. Point the telescope toward the light. Turn the diopter ring and
adjust the diopter so that the cross hairs are clearly
observed.(Turn the diopter ring toward you first and then
backward to focus.)
2. Aim the peak of the triangle mark of the sighting collimator at
the target. Allow a certain space between the sighting
collimator and yourself for sighting.
9.1 Measuring the Horizontal Angle Right and Vertical Angle
9.2 Switching Horizontal Angle Right/Left
A
V 90°10’20”
HR 120°30’40”
V 90°10’20”
HR 0°00’00”
B
V 92°10’20”
HR 160°40’20”
V 90°10’20”
HR 120°30’40”
V 90°10’20”
HL 239°29’20”