Instruction Manual for the DQL-7 Type 62 Compass

DQL-7 Instruction Manual for the Type 62 Compass

Product Overview

Product Implementation Standards :Q/HGY06-2020

I. Uses

The Type 62 compass is used to measure azimuth, distance, horizontal alignment, and slope. ( Pitch angle ) A simple surveying instrument used for measuring height, marching time, speed, and for mapping basic topographic maps; to facilitate nighttime use, luminous powder is applied to its various components.

II. Structure

The Type 62 compass instrument consists primarily of a compass and an odometer. ( As shown in the attached figure. 2) . The compass section has a carrying loop. (1) ,方位 seat (2) , two types of scale lines are engraved on the azimuth plate, with the outer circle being 360 Degree-minute division system, with each graduation line representing 1 degree. The inner circle is 6000( Mil angular unit ) Division system, with the circumference fully刻. 300 刻线, each刻线 is 20( Mil angular unit ) . Contains a magnetic needle (3) , protractor (4) . The graduation unit for the pitch angle is degrees, with each tick mark representing 2.5 Degree, measurable pitch angle. 60 degree. The odometer section mainly consists of the odometer. (8) , measuring wheel (9) , gears, hands, and other components. The odometer consists of 1:25,000 ， 1:50,000 ， 1:75,000 ， 1:100,000 Four scale values, in kilometers.

A surveying scale is mounted on the side of the instrument. The distance between the two tips of the estimator is 12.3 millimeters, the distance between the estimator and the sight is 123 Millimeter.

Instrument external dimensions (length × width × height): 69 times 63 times 27 （ mm )

Instrument weight: 0.125kg

III. Instructions for Use

(1) Determining the azimuth:

1 , Determine the local cardinal directions: north, south, east, and west.

(1) Turn on the compass instrument, so that the azimuth indicator “ N “Aim at” 0”。

(2) Rotate the compass instrument until the north-seeking end of the magnetic needle (the white end) aligns with “ 0 “After that, the direction indicated at this moment is north. The local east, south, west, and north directions can then be directly read on the azimuth glass.”

2 , Calibrate map orientation

Orienting a map involves using a compass to align the map’s azimuths with the true azimuths of the local terrain.

(1) Turn on the compass instrument and adjust the azimuth base so that the azimuth indicator “ N “Align with the local magnetic declination angle.”

(2) Using a surveying ruler and the true meridian or grid north line on the map ( Namely, the inner map boundary line of the east–west map frame. ) Tangent.

(3) Rotate the map so that the north end of the magnetic needle points to “ N ”, then the orientation on the map exactly matches the current orientation.

3 , Determination of Magnetic Azimuth

A Determine the magnetic azimuth of the ground target.

(1) Open the compass so that the mirror is slightly aligned with the azimuth base. 45 degree

(2) Insert the thumb through the carrying loop, hold the instrument horizontally, and aim from the sight through the front sight at the target to be measured.

(3) By observing the division on the azimuth plate aligned with the north end of the magnetic needle in the mirror, you obtain the magnetic azimuth of the target at the observation site.

B Determine the magnetic azimuth of the target on the map.

(1) Use a compass to accurately orient the map and keep it stationary.

(2) Make the surveying ruler tangent to the line connecting the observer’s position and the target point.

(3) Once the magnetic needle comes to rest, the division on the azimuth scale indicated by its north end represents the magnetic azimuth from the observer’s location to the target.

( Two ) Measure distance

1 , Directly measure the map distance using a surveying ruler.

2 , Use mileage to measure the map distance

(1) First, return the red pointer to “ 0”;

(2) Hold the instrument in your hand, gently place the measuring wheel at the starting point, and roll it forward along the measured route to the endpoint.

(3) The corresponding ground distance can be directly read off the scale by noting the graduation line indicated by the pointer.

3 , Use a range estimator to roughly determine the distance to the target on site.

The distance between the two tips of the range finder on the instrument is equal to the sight and front sight spacing. One tenth , the distance to the target can be determined by utilizing the relationship of similar triangles.

1. Two targets are known. ( object ) The distance from the current point; find these two targets. ( object ) The interval between them can be calculated using the following formula:
2. The interval between two targets = Distance between the two targets and the standing point × One tenth

Turn on the instrument, keep your eye close to the sight, and aim at the target; if there are two targets, ( object ) Precisely held between the two tips of the distance estimator. ( As shown in the attached figure. 1) It is also known that the distances between the two target points and the reference point are 100 Then, the interval between the two target points is 100 times 1/10=10 Rice; the rest can be calculated using this method.

In addition, the two targets ahead ( object ) The interval between the two points is not necessarily exactly equal to the angle subtended by the two tips of the distance estimator; when the interval is smaller or larger, the following formula may be used: :

The distance between two target points = The distance between the two targets and the current point × One tenth × the multiple of the interval between the two apices occupied by the two targets

Example : The distances from the two targets to the standing point are known to be 100 Using the meter, the interval between the two targets was measured to be equal to the distance between the two tips of the range estimator. 7/10 then the intermediate situation between the two objectives is 100 × 1/10 × 7/10 = 7 rice

Similarly, the interval between the two targets is equal to the distance between the two tips of the distance estimator. 1.5 times, then the interval between the two targets is 100 times One tenth times 1.5 = 15 rice

(2) Given the width of an object or the separation between two targets, the distance from the target to the observation point can be calculated using the following formula:

Distance between the target point and the station = Known interval of the target x10

Example : The known separation between the two targets ahead is 12 When the meter is precisely clamped between the two tips of the distance estimator, the distance between the target point and the standing point is 12 times 10=120 rice

In addition, the target distance is known, but during aiming, the estimated distance is either shorter or longer.

The spacing between the two tips of the fixture can be calculated using the following formula: :

Distance between the target and the current position = Actual interval of the target / The target is expressed as a multiple of the distance between the two prongs of the range estimator. X10

( Note : Measuring the distance to a target on site using a range estimator is simple, but its accuracy is low. )

• Determine the slope of the inclined plane. ( Pitch angle )

Turn on the instrument so that the reflecting mirror is slightly aligned with the azimuth base. 45 Set the instrument at the desired angle, hold it laterally, and aim along the line of sight and the front and rear sights toward the sloping surface, ensuring that the sighting line is parallel to the slope. Allow the clinometer to swing freely, and by observing through the reflecting mirror, read the elevation angle indicated on the scale of the clinometer’s central graduation—this is the desired elevation angle. ( Slope )。

• Measure the target's approximate height

Known objective ( object ) Determine the horizontal distance to the target point by first measuring the target’s elevation angle and then consulting the altimeter. ( See the attached table. 1) The target’s height can then be determined as follows:

1 , determine the location of the point of interest and the target to be measured using a map or a distance estimator. ( Such as mountain tops, chimneys, and spires. ) the horizontal distance.

2 Hold the instrument laterally, align the telescope and front sight with the target’s apex, allow the protractor to swing freely until it comes to rest, and read the elevation angle indicated by the protractor scale.

3 , Check the altimeter ( Schedule 1) Alternatively, the height can be calculated using the meter-based formula.

Example : The known horizontal distance from the measurement point to the object being measured is 100 Rice, the pitch angle measured by the instrument is 30 °, then check the altimeter, at 100 Align the rice horizontal grid. 30 °The vertical grid shows that the height of the object being measured is 57.74 Rice.

Maintenance and Care of the Four Instruments

1 Do not place the instrument near ferromagnetic materials to avoid demagnetization.

2 Do not strike objects with the surveying ruler to avoid compromising measurement accuracy.

3 Do not bend the reflecting mirror, as this may impair aiming and scale reading; keep the surface clean and smooth, and do not wipe it with dirty cloths or your hands.

4 1. When not in use, the instrument should be turned off and stored in its case; take care to avoid impacts.

Five Supplementary Schedules

Appendix 1: Altimeter

Appendix 2: Magnetic declination in major and medium-sized cities

Harbin Optical Instruments Factory Co., Ltd.

HARBIN OPTICAL INSTRUMENT FACTORY LTD.

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