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This manual contains important safety directions (refer to section"Safety directions") as well as instructions for setting up theinstrument and operating it.Please read this User Manual carefully to achieve maximumefficiency from your Instrument.

Congratulations on your purchase of a new Leica Geosystemsautomatic level.

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The type and the serial number of your instrument are indicated onthe label on the bottom of the base plate.Write the type and serial number of your instrument in the spaceprovided below, and always quote this information when you needto contact your agency or service workshop.

Type: Serial no.:

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The symbols used in this User Manual have the followingmeanings:

DANGER:Indicates an imminently hazardous situation which, if notavoided, will result in death or serious injury.

WARNING:Indicates a potentially hazardous situation or anunintended use which, if not avoided, could result in deathor serious injury.

CAUTION:Indicates a potentially hazardous situation or anunintended use which, if not avoided, may result in minor ormoderate injury and / or appreciable material, financial andenvironmental damage.

Important paragraphs which must be adhered to in practiceas they enable the product to be used in a technicallycorrect and efficient manner.

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Introduction ......................................................................... 7

Measurement preparation ............................................... 10

Measuring ..........................................................................15

Checking and adjusting ................................................... 20

Care and Storage ..............................................................22

Safety Directions ..............................................................25

Accessories ....................................................................... 32

Technical Data .................................................................. 33

Index................................................................................... 34

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Introduction ................................................ 7Special features .......................................... 7Important parts ........................................... 8Technical terms and abbreviations ............ 9

Measurement preparation ...................... 10Unpacking ................................................. 10Setting up the tripod ..................................11Levelling up ............................................... 12Focusing telescope .................................. 13Centring .................................................... 13Selection of angle reading ........................ 14

Measuring ................................................. 15Height reading .......................................... 15Distance measuring .................................. 16Angle measuring ....................................... 16Line levelling ............................................. 17Area levelling ............................................ 18Levelling total station measuring ............. 19Levelled stakeout ...................................... 19

Checking and adjusting .......................... 20Tripod ........................................................ 20Circular level ............................................. 20Checking and adjusting of the line-of-sight 21

Care and Storage ..................................... 22Transport ................................................... 22

In the field ................................................ 22Inside vehicle ........................................... 23Shipping ................................................... 23

Storage ..................................................... 23Cleaning .................................................... 24

Safety Directions ..................................... 25Intended use of instrument ....................... 25

Permitted uses ......................................... 25Adverse uses ........................................... 25

Limits of use ............................................. 26Responsibilities ......................................... 27Hazards of use ......................................... 28

Accessories .............................................. 32Technical Data ......................................... 33Index.......................................................... 34

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The NA720/NA724/NA728/NA730 is a member of a newgeneration of constructionlevels.Its innovative technology makesthe daily surveying jobs easier.

The instrument is ideally suitedfor all applications of a reliableand robust construction level.

The easy operation of theinstrument functions can bequickly learned even byinexperienced surveyors.

Easy operation; quickly tolearn !

Attractive design; low weight.

Endless drive.

Robust and reliable.

Enables angle measurementswith horizontal circle(choice of or gon).

Resistant to water and dirt.

Adaptable to all types oftripods with 5/8" central fixingscrew.

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1 Endless drive (both sides)2 Circular level3 Knurled ring of adjustable

horizontal circle4 Footscrew5 Base plate6 Objective7 Coarse aiming device

(back/fore-sight for NA720/NA724; optical sight withpoint marking for NA728/NA730)

8 Focusing knob9 Cover glass for angle

reading ( or gon)10 Eyepiece11 Level mirror for NA720/

NA724; Level prism forNA728/NA730

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4 5

8 7

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Backsight/Foresight/Intermediate sightFor determining the heightdifference (H) between theground points A and B the backsight (R) is measured firstfollowed by the forward sight(V). Additional points relating toA are measured as intermediatesight (S).

Plumb line

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

Compensator

The compensator in theinstrument is responsible forcompensating the vertical axistilt enabling an exactly horizontalaiming.

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A

B

R V/S

(H)

Plumb line

Verticalaxis tilt

Plumb line

Line-of-sight

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1 Level

2 User Manual

3 Allen key

4 Protective cover

Remove NA720/NA724/NA728/NA730 from the case and check forcompleteness:

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2

1

4

3

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When setting up thetripod pay attention to ahorizontal position of thetripod plate.

Heavy inclinations of the tripodmust be corrected with thefootscrews of the tribrach.

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1. Loosen screws of tripod legs,pull out to required length andtighten screws.

2. In order to guarantee a firmfoothold sufficiently press thetripod legs into the ground.When pressing the legs intothe ground note that the forcemust be applied along thelegs.

Careful handling of tripod

Check all screws and boltsfor correct fit.

During transport always usethe cover supplied.Scratches and otherdamages can result in poorfit and measuringinaccuracies.

Use the tripod only forsurveying jobs.

1.1.

1.

2.2.

2.

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

2. Turn footscrews of tribrachinto its centre position.

3. Centre circular level byturning the foot screws.

Centring the circular level1. Turn foot screws A and B

simultaneously in oppositedirections until bubble is inthe centre (on the imaginary"T").

2. Turn foot screw C until bubbleis centred.

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BA

C

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1. Aim telescope against abright background (e.g. whitepaper).

2. Turn eyepiece until reticule issharp-focused and deepblack. Now the eyepiece isadapted to your eye.

3. Aim telescope on staff usingthe coarse aiming device.

4. Turn focusing knob untilimage of staff is sharplyfocused. If the eye is movedup and down behind theeyepiece the image of thestaff and the reticle may notbe displaced against eachother.

For possible centring over aground point:1. Attach plumb bob.2. Loosen central fixing screw

slightly and shift instrumentparallel on tripod until theplummet is exactly over thepoint.

3. Tighten central fixing screw.

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25

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27

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0

Degree

35010

0

Gon

39010

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A-42 Changing between and gon:

1. Loosen screws with Allen keyand remove cover glass.

2. Turn cover glass.3. Insert cover glass and tighten

screws again.

1.

2.

3.

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Before starting field workor after longer periods of

storage/transport of yourequipment check the fieldadjustment parametersspecified in this User Manual.

Reduce possiblevibrations by holding the

tripod legs.

If the optical parts ofyour instrument are dirty

of fogged, your measurementscan be affected. Keep clean alloptical parts of your instrumentand follow the cleaninginstructions specified in theUser Manual.

1. Setup instrument, level andsharp-focus the reticule.

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

3. Roughly aim on staff usingthe coarse aiming device.

4. Sharp-focus using thefocusing knob.

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5. Fine-aim on staff using theendless drives.

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

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

d

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HH

16

60

Degree

50700

Degree

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L

Result:Distance d = 100 x L

Carry out steps 1 to 6 accordingto height reading.

Reading:Upper distance line: 2.670 mLower distance line: 2.502 m

Difference L: 0.168 mDistance d: 16.8 m

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The NA720/NA724/NA728/NA730 is equipped with ahorizontal circle. The graduationis 1 or 1 gon.

Wanted:Angle between point A and pointB.

Carry out steps 1 to 6 accordingto height measuring. By doingso, align the vertical hair of thereticle to the centre of the staff.7. Turn Hz-circle to "0".8. Align instrument to point B

and aim on the centre of thestaff.

9. Read off Hz-angle from Hz-circle: Example above:Hz = 60.

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A B

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Wanted:Height difference (H) betweenpoint A and B.

Select instrument stationand staff location by

pacing off so, that approximatelythe same target distances result(d1 d2; approx. 40 to 50m).Procedure:1. Setup instrument at I1.

"

2. Setup level staff vertically atpoint A.

3. Aim on staff and read off andtake down height (backsightR).

4. Setup level at thechangepoint 2, aim on staffand read off and take downheight (foresight V).

5. Setup level at I2, aim on staffat the changepoint 2 andread backsight and takedown.

6. Carry out a foresight atchangepoint 3.

7. Continue in the same wayuntil height at point B ismeasured.

Result:H = sum backsight - sum

foresight

PointNo.

Back-sight R

Fore-sight 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

Example of the booking:

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A

B2

3

R VR V R VI1

I2I3

d1 d2

H

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Wanted:Height difference of severalreference points.

The required accuracy isusually not very high

with such measurements.Nevertheless, from time to timeread the staff on a stableintermediate point (reading mustremain the same).

"

Procedure:1. Set up instrument centrally

between the desired points.The instrument telescopemay not be below the highestmeasured intermediate point.

2. Set up staff vertically atreference point A.

3. Aim on staff and read andtake down height (=backsightto known point).

4. Set up staff vertically atpoint 1.

5. Aim on staff and read andtake down height(=measuring intermediatepoint, intermediate sight)

6. Repeat steps 4 and 5 foradditional intermediatepoints.

Height =Height of station point

+ backsight (A)- intermediate sight

PointNo.

Interm.sight Height

A 592.00R1 +2.20

594.20S1 -1.80 592.40S2 -1.90 592.30S3 -2.50 591.70S4 -2.30 591.90

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R S1A 1

2

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S2

S3S4

7. The height of individual pointsare:

Example of booking:

Instrument horizon

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Wanted:Position of several groundpoints.

The levelling total stationmeasuring is normally

carried out during area levelling.

"

Procedure:1. Sequence of measurements

is the same as with arealevelling. However, beside theheight read also the staffsection L (see chapter"Distance measuring") andthe Hz-angle.

2. Transfer measured value intothe map - points aredetermined by position andheight.

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The stakeout is the counterpartto the levelling total stationmeasuring - map points are setout in the field.

Procedure: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

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R

A 1

2

Backsight to known point Measuring ground points

A

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1. Level up instrument.2. Turn instrument by 180.3. If bubble of level is outside

the circle then it should beadjusted (see point 4).

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Connection of individualelements must always be tight.

1.Tighten the Allen screws (2)moderately (if available).

2. Tighten the articulated jointson the tripod head (1) justenough to keep the tripodlegs open when you lift it offthe ground.

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4. Correct the half error usingan Allen key and repeat steps2 and 3 until the bubble oflevel is in the centre in anytelescope direction.

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/2

1. 2.

3.

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With the circular bubble centredand adjusted, the line of sightshould be horizontal.

Checking (see example):1. Choose a distance of appr.

30 m within a gentle terrain.2. Set up a staff at both final

points (A, B).3. Set up the instrument at point

I1 (halfway between A and B,just pass it down) and centrethe bubble.

4. Read both staffs.reading on A = 1.832 mreading on B = 1.616 mH = A - B = 0.216 m

5. Set up the level about 1 mfrom 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, comparenominal-/actual- reading.

When the differencenominal-/actual- reading

is more than 3 mm the line ofsight must be adjusted.

1. Turn the allen key until themiddle hair gives the requiredreading (eg. 1.388 m).

2. Check line of sight again.

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I1

BA

H=1.832 H=1.616

BA

I2

d dH H

actual =1.604

nominal=1.388

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When transporting orshipping the equipment

always use the original LeicaGeosystems packaging(transport case and shippingcardboard).

After a longer period ofstorage or transport of

your instrument always checkthe field adjustment parametersindicated in this manual beforeusing the instrument.

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When transporting theequipment in the field, alwaysmake sure to either carry the instrument in

its original transport case or,

carry the tripod with its legssplayed across your shoulder,keeping the attachedinstrument upright.

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Never transport the instrumentloose inside the vehicle.The instrument can be damagedby blows and vibrations.It must always be transported inits case and be properlysecured.

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When storing theequipment, particularly in

summer and inside a vehicle,take the temperature limits intoaccount. (-40C to +70C /-40F to +158F).

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For shipping the instrument byrail, aircraft or ship use theLeica Geosystems originalpackaging (transport case orshipping cardboard) or anothersuitable packaging, securing theinstrument against blows andvibrations.

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Objective, eyepiece:

Blow dust off lenses andprisms

Never touch the glass withfingers

Use only a clean, soft andlint-free cloth for cleaning. Ifnecessary, moisten the clothwith pure alcohol.

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If the instrumentbecomes wet, leave it

unpacked. Wipe down, clean,and dry the instrument (at notmore than 40 C/ 104F),transport case, foam inserts,and accessories. Pack up theequipment only when it isperfectly dry.

When using the instrument inthe field always close thetransport case.

Use no other liquids; these mayattack polymer components.

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The following directions shouldenable the person responsible,and the person who actuallyuses the instrument, toanticipate and avoid operationalhazards.

The person responsible for theinstrument must ensure that allusers understand thesedirections and adhere to them.

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The level is intended to thefollowing applications:

Line and area levellings Height readings Construction surveying Optical distance measuring

with stadia readings Angle measurements and

staking out with horizontalcircle

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Use of the level withoutprevious instruction

Use outside of the intendedlimits

Disabling safety systems andremoval of hazard notices

Opening the instrument usingtools (screwdriver, etc.),unless this is specificallypermitted for certain functions

Modification or conversion ofthe instrument

Use after misappropriation

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Use with accessories fromother manufacturers withoutthe prior express approval ofLeica Geosystems

Aiming directly into the sun Inadequate safeguards at the

surreying site (e.g. whenmeasuring on roads, etc.)

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Environment:Suitable for use in anatmosphere appropriate forpermanent human habitation:not suitable for use in aggressi-ve or explosive environments.Use in rain is permissible forlonger periods (water proof).

Refer to section"Technical Data".

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WARNING:Adverse use can lead to

injury, malfunction, and materialdamage.It is the task of the personresponsible for the instrument toinform the user about hazardsand how to counteract them.The equipment may only beused if the user is properlyinstructed.

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3*(

Area of responsibility for themanufacturer of the originalequipment Leica GeosystemsAG, CH-9435 HeerbruggLeica Geosystems isresponsible for supplying theproduct, including the usermanual and originalaccessories, in a completelysafe condition.

Responsibilities of themanufacturers of non-Leicaaccessories:

The manufacturers ofnon-Leica Geosystems

accessories are responsible fordeveloping, implementing andcommunicating safety conceptsfor their products, and are alsoresponsible for the effectivenessof those safety concepts incombination with the LeicaGeosystems product.

Responsibilities of the personin charge of the instrument:WARNING:

The person responsiblefor the instrument mustensure that it is used in

accor-dance with theinstructions. This person is alsoaccountable for the training anddeployment of personnel whouse the instrument and for thesafety of the equipment when inuse. The person in charge of theinstrument has the followingduties: To understand the safety

instructions on the productand the instructions in theUser Manual.

To be familiar with localregulations relating toaccident prevention.

To inform Leica Geosystemsimmediately if the equipmentbecomes unsafe.

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WARNING:The absence of

instruction, or the inadequateimparting of instruction, canlead to incorrect or adverse use,and can give rise to accidentswith far-reaching human,material, financial and environ-mental consequences.Precautions:All users must follow the safetydirections given by themanufacturer and the directionsof the person responsible for theinstrument.

CAUTION:Watch out for erroneous

measurements if the instrumentis defective or if it has beendropped or has been misused ormodified.Precautions:Periodically carry out testmeasurements and perform thefield adjustments indicated inthe User Manual particularlyafter the instrument has beensubjected to abnormal use andbefore and after importantmeasurements.

DANGER:Because of the risk of

electrocution, it is verydangerous to use levelling staffsand extensions in the vicinity ofelectrical installations such aspower cables or electricalrailways.Precautions:Keep at a safe distance fromelectrical installations. If it isessential to work in thisenvironment, first contact thesafety authorities responsible forthe electrical installations andfollow their instructions.

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WARNING:By surveying during a

thunderstorm you are at riskfrom lightning.Precautions:Do not carry out field surveysduring thunderstorms.

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WARNING:Inadequate securing of

the surveying site can lead todangerous situations, forexample in traffic, on buildingsites and at industrialinstallations.Precautions:Always ensure that thesurveying site is adequatelysecured. Adhere to the localregulations governing accidentprevention and road traffic.

CAUTION:Be careful when aiming

your level into the sun. Directsolar radiation can hurt youreyes.Precautions:Do not aim directly at the sun.

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CAUTION:If the accessories used

with the instrument are notproperly secured, and theequipment is subjected tomechanical shock (e.g. blows,falling etc.), the equipment maybe damaged, safety devicesmay be ineffective or peoplemay sustain injury.

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Precautions:When setting-up the instrument,make sure that the accessories(e.g. tripod, staff, staff brace, ...)are correctly adapted, fitted,secured and locked in position.Avoid subjecting the equipmentto mechanical shock.Never position the instrument onthe tripod baseplate withoutsecurely tightening the centralfixing screw. If the screw isloosened always remove theinstrument immediately from thetripod.

CAUTION:When using a vertical

staff supported by one bracethere is always the danger offalling (e.g. by wind gusts) andtherefore danger of damage toequipment and danger ofpersonal injuries.Precautions:Never leave a vertical staffsupported by a braceunsupervised (person at thestaff).

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WARNING:If the equipment is

improperly disposed of, thefollowing can happen: If polymer parts are burnt,

poisonous gases areproduced which may impairhealth.

By disposing of theequipment irresponsibly youmay enable unauthorizedpersons to use it incontravention of theregulations, exposingthemselves and third partiesto the risk of severe injuryand rendering theenvironment liable tocontamination.

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Precautions:Dispose of the equipmentappropriately in accordance withthe regulations in force in yourcountry. Always prevent accessto the equipment byunauthorized personnel.

32

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User Manual

Protective cover

Allen key

Level base

Standard level staff

Tripod

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Compensator: Working range 15' Setting accuracy

(standard deviation) < 0.5"Circular level: Sensitivity 10' / 2 mm

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

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

Temperature range: Storage - 40C bis + 70C

(-40F bis +158F) Operating - 20C bis + 50C

(-4F bis + 122F)

+!!/

type NA720 NA724 NA728 NA730

AccuracyStandard deviation for 1 kmdouble levelling 2.5 mm 2 mm 1.5 mm 1.2 mm

Height accuracy for a singlemeasurement at 30 m 1.5 mm 1.2 mm 1 mm 0.8 mm

TelescopeImage vertical vertical vertical verticalMagnification 20x 24x 28x 30xShortest target distance < 0.5 m < 0.5 m < 0.7 m < 0.7 mField of view at 100 m > 4 m > 3.5 m > 3 m > 3 mMultiplication factor 100 100 100 100Additive constant 0 0 0 0Resolution (higher than) 4" 3.5" 3" 3"

34

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A Accident prevention ..................................... 29Angle measuring .......................................... 16Area levelling ............................................... 18

B Booking ................................................. 17, 18Bubble ................................................... 12, 20

C Central fixing screw ..................................... 12Centring ........................................................ 13Circular level .................................. 12, 15, 20Cleaning ....................................................... 24Compensator ................................................. 9

D Distance line ................................................ 16

E Electrical installations .................................. 28Environment ................................................. 26Eyepiece ...................................................... 13

F Focusing ...................................................... 13

H Height difference ............................. 9, 17, 18Horizontal circle ........................................... 16Hz-angle ....................................................... 19Hz-circle ....................................................... 16

L Line levelling ................................................ 17Line-of-sight ................................................. 21

O Optical sight ................................................. 13

P Packaging .................................................... 23Plumb bob .................................................... 13Plummet ....................................................... 13

35

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R Rearrangement point ................................... 17Reticule ................................................. 13, 15

S Safe distance ............................................... 28Sharp-focus ................................................. 15Shipping ................................................ 22, 23Stakeout ....................................................... 19Storage .................................................. 22, 24Storing .......................................................... 23

T Target distances .......................................... 17Total station measuring ............................... 19Transport ...................................................... 22Transport case ...................................... 22, 24Tripod ........................................................... 20

V Vibrations ..................................................... 15

W Wet instrument ............................................ 24

! "#$%%&'()!"#&*%%&'+

, !#+

Printed in Switzerland - Copyright LeicaGeosystems AG, Heerbrugg,Switzerland 2000Translation of original text (712354-1.0.1de)

712355-1.0.1en

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Introduction Special features Important parts Technical terms and abbreviations Measurement preparation Unpacking Setting up the tripod Levelling up Focusing telescope Centring Selection of angle reading Measuring Height reading Distance measuring Angle measuring Line levelling Area levelling Levelling total station measuring Levelled stakeout Checking and adjusting Tripod Circular level Checking and adjusting of the line-of-sight Care and Storage Transport In the field Inside vehicle Shipping Storage Cleaning Safety Directions Intended use of instrument Permitted uses Adverse uses Limits of use Responsibilities Hazards of use Accessories Technical Data Index AAccident prevention Angle measuring Area levelling

BBooking Bubble

CCentral fixing screw Centring Circular level Cleaning Compensator

DDistance line

EElectrical installations Environment Eyepiece

FFocusing

HHeight difference Horizontal circle Hz-angle Hz-circle

LLine levelling Line-of-sight

OOptical sight

PPackaging Plumb bob Plummet

RRearrangement point Reticule

SSafe distance Sharp-focus Shipping Stakeout Storage Storing

TTarget distances Total station measuring Transport Transport case Tripod

VVibrations

WWet instrument