GPI NP-732 Series Manuel utilisateur

Automatic Level

NP-732

INSTRUCTIONS FOR USE

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Contents

Before use…………………………………………………2

1.Nomenclature.………………………………………………3

2.Operation…………………………………...……………….4

2-1 Preparing before surveying……………………….……….….4

2-2 Surveying method………….…………...………...……..…….5

2-2-1 Measuring altitude difference……………………………..….5

2-2-2 Measuring horizontal angle…………………………………..7

2-2-3 Measuring distance using the stadia lines…………..……….7

3.Regular checking/ adjusting………………………..……..……9

3-1 Checking and adjusting of the circular level……………..…9

3-2 Checking of the compensator………………………………...10

3-3 Checking of i angle…………………………………….….....10

4.Parameter and technical index……………………………12

5.Standard configuration………………...………………….12

NP-732 SERIES

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Before use

1 Operation

1) The NP-732 series automatic level is a precision instrument. Handle

it carefully according to the engineering measurement regulations,

and keep it away from heavy shocks and vibration.

2) Never place the instrument directly on the ground to avoid damage to

the base surface or thread.

3) Before using, please check the compensator.

2 Maintenance

1) Use a neutral cleaning or water to clean the horizontal circle scale

window and the instrument, never use an organic solvent.

2) Use optical lens tissue to clean the objective and the eyepiece

carefully.

3) Do not take down or assemble it yourself that is not mentioned in this

manual.

4) After use, store it in a container to prevent dust, and put it in a dry

and clean place.

5) In order to keep the high precision of the instrument, appraise the

instrument regularly one or two times a year.

NP-732 SERIES

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1. Nomenclature

NP-732 SERIES

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2.Operation

2-1 Preparing before surveying

(1) Spread the tripod-legs so that the leg-tips form a regular triangle.

Extend the legs until the tripod head is roughly at 10cm lower than

your eye level and then fasten the extension clamp screws.

(2) Make sure that the tripod head is approximately level. Stamp the

tripod-feet firmly into the ground.

(3) Set the automatic level onto the tripod head and tighten the

center-screw.

(4) If using a spherical-head tripod, loosen the center screw and hold the

base plate, then let the level to slide on the spherical-head tripod and

get the bubble in the center (See fig.1).

(5) Fasten the center-screw.

(6) Adjust the three leveling screws to get the bubble in the center (See

fig.2).

Fig.1

NP-732 SERIES

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2.Operation

(7)Adjust the eyepiece until the image of the reticle is clear.

(8) Aim the objective at the staff through the sight gage of the

instrument.

(9) Turn the focusing knob to get the staff image very clear. Shift your

eyes around in the field of view and make sure that there is no

displace between the reticle and the staff, then the surveying and

reading can be done. Adjust horizontal fine moving knob to aim the

telescope at the target.

2-2Surveying method

2-2-1Measuring altitude difference

(1) Set up the instrument at a point approximately halfway between

points A and B. (See fig.3)

Fig.2

NP-732 SERIES

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2.Operation

(2) Set up the staff vertically at point A, and take the reading a

(backsight).

(3) Set up the staff vertically at point B, and take the reading b

(foresight).

(4) The altitude difference h from B toA is h=a-b.

(5) If the distance between A and B is too long, or the altitude

difference from B to A is too large, divide the distance into some

regions, then carry on measuring in each region. (See fig.4)

Fig.3

Fig.4

NP-732 SERIES

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2.Operation

Calculation of altitude difference as follow:

Altitude difference=Sum of backsight-Sum of foresight

Altitude of the surveying point=Altitude of known point+Altitude

difference

2-2-2Measuring horizontal angle

The horizontal-circle-scale is graduated in minimum value of 1°and

numbered every 10°.

(1)Use the plumb-bob to set the center of the instrument right above the

surveying point.

(2)Aim the telescope at pointA and set the horizontal-circle-scale to 0°

by turning the horizontal circle positing ring.

(3)Aim the telescope at point B and take the angle reading. It’s the angle

of position between A and B. (See fig.5)

2-2-3Measuring distance using the stadia lines

Using the top and bottom stadia lines on the reticle, the distance

between the center of the instrument and the staff can be measured

approximately. Aim the telescope at the staff, read the number of

Fig.5

NP-732 SERIES

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2.Operation

centimeters on the staff between two stadia lines, then transform it

into number of meter by multiplying 100, and the number of meter is

the distance between the center of instrument and the staff. (See fig6)

Fig.6

NP-732 SERIES

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3.Regular checking /adjusting

3-1 Checking and adjusting of the circular level

(1)Adjust the leveling screws to center the bubble in the circular level.

(2)Turn the instrument 360°. If the bubble is still in the center, it means

that the circular level is workable.

(3)If the bubble shifts away from the center, please adjust according to

following methods:

Move the bubble one half of the shift to the center of the circular level

by adjusting the leveling screws. Then get the bubble in the center of

the circular level by adjusting the circular level adjust-screw with the

hexagonal wrench. Repeat the above checking and adjusting, until the

bubble does not shift when the instrument turns to any direction. (See

fig.7)

3-2 Checking of the compensator

(1)Center the bubble in the circular level, and aim the telescope at a

target about 70m away.

(2)Turning the leveling screws to make the bubble slide out about 1/4 of

the circular to any direction, if there is no deviation between the image

of target and the horizontal cross-lines, it means that the working range

Fig.7

NP-732 SERIES

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