Leica Geosystems 833190, 641983, 641982 User manual

Version 2.0
English

Leica NA720/724/
728/730/730 plus

User Manual

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NA720/724/728/730/730 plus, Introduction

Introduction

Purchase Congratulations on the purchase of a Leica NA720/724/728/730/730 plus.

This manual contains important safety directions as well as instructions for setting
up the product and operating it. Refer to "1 Safety Directions" for further informa­tion.
Read carefully through the User Manual before you switch on the product.

2

Product identifica­tion

The type and serial number of your product are indicated on the type plate.
Enter the type and serial number in your manual and always refer to this information

Type: _______________

Serial No.: _______________

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Symbols The symbols used in this manual have the following meanings:

Type Description

DANGER



WARNING



CAUTION



NOTICE Indicates a potentially hazardous situation or an unintended



Indicates an imminently hazardous situation which, if not
avoided, will result in death or serious injury.

Indicates a potentially hazardous situation or an unintended
use which, if not avoided, could result in death or serious
injury.

Indicates a potentially hazardous situation or an unintended
use which, if not avoided, may result in minor or moderate
injury.

use which, if not avoided, may result in appreciable material,
financial and environmental damage.

Important paragraphs which must be adhered to in practice as
they enable the product to be used in a technically correct and
efficient manner.

Validity of this
manual

NA720/724/728/730/730 plus, Introduction 3

This manual applies to the NA720/724/728/730/730 plus instruments. Differences
between the various models are marked and described.

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NA720/724/728/730/730 plus, Introduction

Available docu­mentation

Name Description/Format

NA720/724/
728/730/730
plus User
Manual

Refer to the following resources for all NA720/724/728/730/730 plus docu­mentation:

•

All instructions required in order to operate the product
to a basic level are contained in the User Manual.
Provides an overview of the product together with tech­nical data and safety directions.

4



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Table of Contents

In this manual Chapter Page

1 Safety Directions

1.1 General Introduction 7

1.2 Definition of Use 8

1.3 Limits of Use 9

1.4 Responsibilities 10

1.5 Hazards of Use 11

2 Description of the System

2.1 Container Contents 16

2.2 Instrument Components 17

2.3 Understanding Terms and Expressions 18

3Operation

3.1 Preparation 20

3.2 Measurement 27

3.3 Check & Adjust 37

NA720/724/728/730/730 plus, Table of Contents 5

15

20

7

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NA720/724/728/730/730 plus, Table of Contents

6

4 Care and Transport

4.1 Transport 42

4.2 Storage 43

4.3 Cleaning and Drying 44

5 Technical Data

6 Accessories

42

45

48

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1 Safety Directions

1.1 General Introduction

Description The following directions enable the person responsible for the product, and the

NA720/724/728/730/730 plus, Safety Directions 7

person who actually uses the equipment, to anticipate and avoid operational
hazards.

The person responsible for the product must ensure that all users understand these
directions and adhere to them.

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NA720/724/728/730/730 plus, Safety Directions

1.2 Definition of Use

Intended Use • Optical height readings.

• Optical distance measuring with stadia readings.

8

Reasonably fore­seeable misuse

• Use of the product without instruction.

• Use outside of the intended use and limits.

• Disabling safety systems.

• Removal of hazard notices.

• Opening the product using tools, for example screwdriver, unless this is
permitted for certain functions.

• Modification or conversion of the product.

• Use after misappropriation.

• Use of products with recognisable damages or defects.

• Use with accessories from other manufacturers without the prior explicit
approval of Leica Geosystems.

• Aiming directly into the sun.

• Inadequate safeguards at the working site.

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1.3 Limits of Use

Environment Suitable for use in an atmosphere appropriate for permanent human habitation: not

DANGER



NA720/724/728/730/730 plus, Safety Directions 9

suitable for use in aggressive or explosive environments.

Local safety authorities and safety experts must be contacted before working in
hazardous areas, or close to electrical installations or similar situations by the person
in charge of the product.

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NA720/724/728/730/730 plus, Safety Directions

1.4 Responsibilities

10

Manufacturer of
the product

Person responsible
for the product

Leica Geosystems AG, CH-9435 Heerbrugg, hereinafter referred to as Leica Geosys­tems, is responsible for supplying the product, including the user manual and original
accessories, in a safe condition.

The person responsible for the product has the following duties:

• To understand the safety instructions on the product and the instructions in the
user manual.

• To ensure that it is used in accordance with the instructions.

• To be familiar with local regulations relating to safety and accident prevention.

• To inform Leica Geosystems immediately if the product and the application
becomes unsafe.

• To ensure that the national laws, regulations and conditions for the operation of
e.g. radio transmitters or lasers are respected.

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1.5 Hazards of Use

CAUTION



DANGER



NOTICE Strong magnetic fields in the immediate vicinity (e.g. transformers, melting

NA720/724/728/730/730 plus, Safety Directions 11

Watch out for erroneous measurement results if the product has been dropped or
has been misused, modified, stored for long periods or transported.

Precautions:

Periodically carry out test measurements and perform the field adjustments indicated
in the user manual, particularly after the product has been subjected to abnormal use
and before and after important measurements.

Because of the risk of electrocution, it is dangerous to use poles and extensions in
the vicinity of electrical installations such as power cables or electrical railways.

Precautions:

Keep at a safe distance from electrical installations. If it is essential to work in this
environment, first contact the safety authorities responsible for the electrical instal­lations and follow their instructions.

furnaces...) may influence the compensator and lead to measuring errors.

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NA720/724/728/730/730 plus, Safety Directions

Precautions:

When working near strong magnetic fields, check results for plausibility.

12







CAUTION

WARNING

WARNING

Be careful when pointing the product towards the sun, because the telescope func­tions as a magnifying glass and can injure your eyes and/or cause damage inside the
product.

Precautions:

Do not point the product directly at the sun.

During dynamic applications, for example stakeout procedures there is a danger of
accidents occurring if the user does not pay attention to the environmental condi­tions around, for example obstacles, excavations or traffic.

Precautions:

The person responsible for the product must make all users fully aware of the existing
dangers.

Inadequate securing of the working site can lead to dangerous situations, for
example in traffic, on building sites, and at industrial installations.

Precautions:

Always ensure that the working site is adequately secured. Adhere to the regulations
governing safety and accident prevention and road traffic.

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

CAUTION

If the accessories used with the product are not properly secured and the product is
subjected to mechanical shock, for example blows or falling, the product may be
damaged or people can sustain injury.

Precautions:

When setting-up the product, make sure that the accessories are correctly adapted,
fitted, secured, and locked in position.
Avoid subjecting the product to mechanical stress.

WARNING



WARNING



NA720/724/728/730/730 plus, Safety Directions 13

If the product is used with accessories, for example masts, staffs, poles, you may
increase the risk of being struck by lightning.

Precautions:

Do not use the product in a thunderstorm.

If the product is improperly disposed of, the following can happen:

• If polymer parts are burnt, poisonous gases are produced which may impair
health.

• If batteries are damaged or are heated strongly, they can explode and cause
poisoning, burning, corrosion or environmental contamination.

• By disposing of the product irresponsibly you may enable unauthorised persons
to use it in contravention of the regulations, exposing themselves and third
parties to the risk of severe injury and rendering the environment liable to
contamination.

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NA720/724/728/730/730 plus, Safety Directions

Precautions:

The product must not be disposed with household waste.
Dispose of the product appropriately in accordance with the national
regulations in force in your country.
Always prevent access to the product by unauthorised personnel.

Product-specific treatment and waste management information can be downloaded

14



WARNING

Only Leica Geosystems authorised service workshops are entitled to repair these
products.

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2 Description of the System

General descrip­tion

NA720/724/728/730/730 plus, Description of the System 15

The NA720/724/728/730/730 plus is a member of a new generation of construction
levels.
Its innovative technology makes the daily surveying jobs easier.
The instrument is ideally suited for all applications of a reliable and robust construc­tion level.
The easy operation of the instrument functions can be quickly learned even by inex­perienced surveyors.

• Easy operation; quickly to learn!

• Attractive design; low weight.

• Endless drive.

• Robust and reliable.

• Enables angle measurements with horizontal circle (choice of ° or gon).

• Resistant to water and dirt (IP57).

• Adaptable to all types of tripods with 5/8" central fixing screw.

• Nitrogen filled telescope to prevent fogging the lens.

• 3 years without additional costs with Leica Protect.

• Produced (in accordance to ISO 9001 and ISO 14001) and proofed with ISO
17123-2

• Swiss technology

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NA720/724/728/730/730 plus, Description of the System

008716_001

a

b

c

d

e

2.1 Container Contents

Container contents

16

a) Allen key
b) Protective cover
c) CD user manual
d) Customer information,

Manufacturer certification,
Protect card

e) Level

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2.2 Instrument Components

008715_001

a

b

c

d

e

f

g

g

h

i

j

k

Instrument compo­nents

a) Level mirror for NA720/NA724; Level

prism for NA728/NA730/NA730 plus

b) Eyepiece
c) Cover glass for angle reading (° or gon)
d) Focusing knob
e) Coarse aiming device (back/fore-sight for

NA720/NA724; optical sight with point
marking for NA728/NA730/NA730 plus)

NA720/724/728/730/730 plus, Description of the System 17

f) Objective
g) Endless drive (both sides)
h) Circular level
i) Knurled ring of adjustable hori-

zontal circle
j) Footscrew
k) Base plate

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NA720/724/728/730/730 plus, Description of the System

2.3 Understanding Terms and Expressions

Plumb line

b

18

008717_001

By centring the circular level the instrument is nearly levelled up. A small instrument
tilt remains (the vertical axis tilt).

a

a) Plumb line
b) Vertical axis tilt

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Compensator

008809_001

R

V/S

B

A

(ΔH)

b

008788_001

The compensator in the instrument is responsible for compensating the vertical axis
tilt enabling an exactly horizontal aiming.

Backsight/Fore­sight/Intermediate
sight

For determining the height difference (∆H) between the ground points A and B the
back sight (R) is measured first followed by the forward sight (V). Additional points
relating to A are measured as intermediate sight (S).

NA720/724/728/730/730 plus, Description of the System 19

a

a) Plumb line
b) Line of sight

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NA720/724/728/730/730 plus, Operation

3 Operation

3.1 Preparation

20

Tripod

When setting up the tripod pay attention



to ensuring a horizontal position of the
tripod plate. Slight corrections of inclina­tion can be made with the foot screws of
the tribrach. Larger corrections must be
done with the tripod legs.

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Loosen the clamping screws on the tripod

a

b

legs, pull out to the required length and
tighten the clamps.

a) In order to guarantee a firm foothold

sufficiently press the tripod legs into
the ground.

b) When pressing the legs into the ground

note that the force must be applied
along the legs.

Careful handling of tripod.

• Check all screws and bolts for correct
fit.

• During transport always use the cover
supplied.

• Use the tripod only for surveying tasks.

NA720/724/728/730/730 plus, Operation 21

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NA720/724/728/730/730 plus, Operation

008790_001

Levelling up,
step-by-step

1. Place level onto tripod head. Tighten central
fixing screw of tripod.

2. Turn footscrews of tribrach into its centre
position.

3. Centre circular level by turning the foot­screws.

22

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Centring the circular level

008791 001

A

B

C

1. Turn footscrews A and B simultaneously in
opposite directions until bubble is in the
centre (on the imaginary "T").

2. Turn footscrew C until bubble is centred.

NA720/724/728/730/730 plus, Operation 23

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NA720/724/728/730/730 plus, Operation

Selection of angle

Changing between ° and gon:

reading

1

24

3

2

008803_001

Degree

0

35010

Gon

0

39010

Step Description

1. Loosen screws with Allen key and remove cover glass.

2. Turn cover glass.

3. Insert cover glass and tighten screws again.

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Focusing telescope

008816_001

25

26

27

008817_001

Step Description

1. Aim telescope against a bright background (e.g.
white paper).

2. Turn eyepiece until reticule is sharp-focused and
deep black. Now the eyepiece is adapted to your
eye.

3. Aim telescope on staff using the coarse aiming
device.

4. Turn focusing knob until image of staff is sharply
focused. If the eye is moved up and down behind
the eyepiece the image of the staff and the reticle
may not be displaced against each other.

NA720/724/728/730/730 plus, Operation 25

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NA720/724/728/730/730 plus, Operation

008818_001

Centring

Step Description

For possible centring over a ground point:

1. Attach plumb bob.

2. Loosen central fixing screw slightly and shift instru­ment parallel on tripod until the plummet is exactly
over the point.

3. Tighten central fixing screw.

26

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3.2 Measurement

H

d

26

27

H

008793_001

Height reading

NA720/724/728/730/730 plus, Operation 27

Before starting field work or after longer periods of storage/transport of



your equipment check the field adjustment parameters specified in this User
Manual.
Reduce possible vibrations by holding the tripod legs.



If the optical parts of your instrument are dirty of fogged, your measure-



ments can be affected. Keep clean all optical parts of your instrument and
follow the cleaning instructions specified in the User Manual.

Step Description

1. Setup instrument, level and sharp-focus the reti­cule.

2. Setup level staff vertically (refer also to Instruction
Manual of staff).

3. Roughly aim on staff using the coarse aiming
device.

4. Sharp-focus using the focusing knob.

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NA720/724/728/730/730 plus, Operation

25

26

27

L

008794_001

Step Description

5. Fine-aim on staff using the endless drives.

6. Check if circular level is centred (view level
prism/level mirror).

7. Read off height H at the centre hair of the reticle.
Example above: H = 2.585 m

28

27

26

25

008795_001

Distance meas­uring

Carry out steps 1 to 6 according to height reading.

Reading:

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Upper distance line: 2.670 m

0

Degree

35010

008796_001

Lower distance line: 2.502 m
Difference L: 0.168 m
Distance d: 16.8 m

Result: Distance d = 100 x L

Angle measuring The NA720/724/728/730/730 plus is equipped with a horizontal circle. The gradua-

tion is 1° or 1 gon.

Wanted:

Angle between point A and point B.
Carry out steps 1 to 6 according to height measuring. By doing so, align the vertical
hair of the reticle to the centre of the staff.

NA720/724/728/730/730 plus, Operation 29

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NA720/724/728/730/730 plus, Operation

60

Degree

5070

008797_001

A

B

Step Description

1. Turn Hz-circle to "0".

2. Align instrument to point B and aim on the

centre of the staff.

3. Read off Hz-angle from Hz-circle:

Example above: Hz = 60°.

Line levelling

30

A

008798_001

R

d

1

V

d

2

I

1

R

2

V

I

2

R

3

V

I

3

B

ΔH

Wanted:

Height difference (∆H) between point A and B.

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Select instrument station and staff location by pacing off so, that approxi-



mately the same target distances result (d1 ≈ d2; approx. 40 to 50m).

Procedure:

Step Description

1. Setup instrument at I1.

2. Setup level staff vertically at point A.

3. Aim on staff and read off and take down height (backsight R).

4. Setup level at the changepoint 2, aim on staff and read off and take down

height (foresight V).

5. Setup level at I2, aim on staff at the changepoint 2 and read backsight and

take down.

6. Carry out a foresight at changepoint 3.

7. Continue in the same way until height at point B is measured.

Result:

∆H = sum backsight - sum foresight

NA720/724/728/730/730 plus, Operation 31

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NA720/724/728/730/730 plus, Operation

1

2

3

4

S3

S2

S1

R

A

S4

008811_001

Example of the booking:

Point No. Backsight R Foresight V Height

A +2.502 650.100

2 +0.911 -1.803

3 +3.103 -1.930

B -0.981 651.902

Sum +6.516 -4.714 ∆H= +1.802

Area levelling

Wanted:

Height difference of several reference points.

32

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The required accuracy is usually not very high with such measurements.



Nevertheless, from time to time read the staff on a stable intermediate point
(reading must remain the same).

Procedure:

Step Description

1. Set up instrument centrally between the desired points. The instrument tele-

scope may not be below the highest measured intermediate point.

2. Set up staff vertically at reference point A.

3. Aim on staff and read and take down height (=backsight to known point).

4. Set up staff vertically at point 1.

5. Aim on staff and read and take down height (=measuring intermediate point,

intermediate sight)

6. Repeat steps 4 and 5 for additional intermediate points.

7. The height of individual points are:

Height = Height of station point
+ backsight (A)

- intermediate sight

NA720/724/728/730/730 plus, Operation 33

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NA720/724/728/730/730 plus, Operation

Example of the booking:

Point No. Interm. sight Height

A592.00

R1 +2.20

 594.20

S1 -1.80 592.40

S2 -1.90 592.30

S3 -2.50 591.70

S4 -2.30 591.90

 = Instrument horizon

34

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Levelling total

R

A

008802_001

station measuring

Wanted:

Position of several ground points.

The levelling total station measuring is normally carried out during area level-



ling.

Procedure:

Step Description

1. Sequence of measurements is the same as with area levelling. However,

beside the height read also the staff section L (see chapter "Distance meas­uring") and the Hz-angle.

2. Transfer measured value into the map - points are determined by position

and height.

NA720/724/728/730/730 plus, Operation 35

Backsight to known point

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NA720/724/728/730/730 plus, Operation

008823_001

A

2

1

Levelled stakeout

The stakeout is the counterpart to the levelling total station measuring - map points
are set out in the field.

Procedure:

Step Description

1. Set up instrument at a known point, centre and level up.

2. Focus instrument and aim on known orientation point.

3. Orient horizontal circle (Hz-direction).

4. Move staff to stakeout point on the basis of known values (distance and Hz-

angle, height) and stakeout point.

36

Measuring ground points

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3.3 Check & Adjust

TSOX_122

1

2

3

Service the tripod
step-by-step

The connections between metal and timber components must always be



firm and tight.

1) Tighten the leg cap screws moderately with the allen key supplied.

2) Tighten the articulated joints on the tripod head just enough to keep the tripod
legs open when lifting the tripod off the ground.

3) Tighten the screws of the tripod legs.

NA720/724/728/730/730 plus, Operation 37

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NA720/724/728/730/730 plus, Operation

008799_001

2

1

3

Δ

Circular Level

Step Description

1. Level up instrument.

2. Turn instrument by 180°.

3. If bubble of level is outside the circle then it should
be adjusted (see point 4.).

38

4. Correct the half error using an Allen key and
repeat steps 2 and 3 until the bubble of level is in
the centre in any telescope direction.

Δ/2

008800_001

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Checking the line

dd

A

B

ΔH

H=1.832 H=1.616

δδ

I

1

008979_001

of sight

NA720/724/728/730/730 plus, Operation 39

Step Description



1. Choose a distance of appr. 30 m

2. Set up a staff at both final points (A,

3. Set up the instrument at point I1

4. Read both staffs.

With the circular bubble centred and
adjusted, the line of sight should be
horizontal.

within a gentle terrain.

B).

(halfway between A and B, just pass it
down) and centre the bubble.

Reading on A = 1.832 m
Reading on B = 1.616 m
∆H = A - B = 0.216 m

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NA720/724/728/730/730 plus, Operation

A

B

ΔH

δ

I

2

008980_001_en

actual = 1.604

nominal
= 1.388

Step Description

5. Set up the level about 1 m from staff

A.

6. Read staff A (eg.: 1.604 m).

7. Find nominal reading B; eg.:

Reading A - ∆H = 1.604 m - 0.216 m =

1.388 m.

8. Read staff B, compare nominal-

/actual- reading.

40

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Adjusting the line
of sight

NA720/724/728/730/730 plus, Operation 41

Step Description

When the difference nominal-/actual- reading is



more than 3 mm the line of sight must be adjusted.

1. Turn the allen key until the middle hair gives the
required reading (eg. 1.388 m).

2. Check line of sight again.

Before starting field work or after long periods of



storage/ transport of your equipment check the
field adjustment parameters specified in this User
Manual.

008815_001

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NA720/724/728/730/730 plus, Care and Transport

4 Care and Transport

4.1 Transport

42

Transport in the
field

Transport in a road
vehicle

Shipping When transporting the product by rail, air or sea, always use the complete original

Field adjustment Periodically carry out test measurements and perform the field adjustments indicated

When transporting the equipment in the field, always make sure that you

• either carry the product in its original transport container,

• or carry the tripod with its legs splayed across your shoulder, keeping the
attached product upright.

Never carry the product loose in a road vehicle, as it can be affected by shock and
vibration. Always carry the product in its transport container, original packaging or
equivalent and secure it.

Leica Geosystems packaging, transport container and cardboard box, or its equiva­lent, to protect against shock and vibration.

in the User Manual, particularly after the product has been dropped, stored for long
periods or transported.

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4.2 Storage

Product Respect the temperature limits when storing the equipment, particularly in summer

Field adjustment After long periods of storage inspect the field adjustment parameters given in this

NA720/724/728/730/730 plus, Care and Transport 43

if the equipment is inside a vehicle. Refer to "5 Technical Data" for information about
temperature limits.

user manual before using the product.

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NA720/724/728/730/730 plus, Care and Transport

4.3 Cleaning and Drying

44

Product and acces­sories

Damp products Dry the product, the transport container, the foam inserts and the accessories at a

• Blow dust off lenses.

• Never touch the glass with your fingers.

• Use only a clean, soft, lint-free cloth for cleaning. If necessary, moisten the cloth
with water or pure alcohol. Do not use other liquids; these can attack the
polymer components.

temperature not greater than +40°C/+104°F and clean them. Do not repack until
everything is dry. Always close the transport container when using in the field.

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5 Technical Data

Accuracy Standard deviation for 1 km double levelling ISO17123-2:

NA720: 2.5 mm
NA724: 2.0 mm
NA728: 1.5 mm
NA730: 1.2 mm
NA730 plus: 0.7 mm

Height accuracy for a single measurement at 30 m:

NA720: 1.5 mm
NA724: 1.2 mm
NA728: 1 mm
NA730: 0.8 mm
NA730 plus: 0.4 mm

Telescope

NA720/724/728/730/730 plus, Technical Data 45

Erect image
Magnification

NA720: 20 x
NA724: 24 x
NA728: 28 x
NA730/NA730 plus: 30 x

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NA720/724/728/730/730 plus, Technical Data

Field of view (at 100 m): > 4 m (NA720)

Shortest target distance: < 0.5 m (NA720/NA724)

46

> 3.5 m (NA724)
> 3 m (NA728/NA730/NA730 plus)

< 0.7 m (NA728/NA730/NA730 plus)

Distance measure­ment

Compensator

Circular level

Circle

Multiplication factor: 100 (all instruments)
Additive constant: 0 (all instruments)
Resolution (higher than) 4" (NA720)

Working range: ±15’
Setting accuracy
(standard deviation):

Sensitivity: 10’/2 mm

Graduation: 360°/400gon
Graduation interval: 1°/1gon

3.5" (NA724)
3" (NA728/NA730/NA730 plus)

0.5’’

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Adaption

To normal or ball head tripod
Central fixing screw: 5/8’’

Environmental
specifications

NA720/724/728/730/730 plus, Technical Data 47

Temperature

Operating temperature Storage temperature

-20°C to +50°C
(-4°F to +122°F)

-40°C to +70°C
(-40°F to +158°F)

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NA720/724/728/730/730 plus, Accessories

008981_001

a

b

c

d

e

6 Accessories

Purchasable Acces­sory

48

a) Protective cover
b) Allen key
c) Level base
d) Standard level staff
e) Tripod

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