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Instruction Manual for the SSY-1 Handheld Level
Release Date:
2021-08-12
SSY-1 Instruction Manual for the Model Handheld Level
SSY-1 The handheld level (commonly referred to as a “hand level”) is a simple surveying instrument that can roughly measure the elevation difference and inclination angle (or slope) between two points on the ground. It is lightweight and highly portable, making it extremely convenient for field surveys and transport. It is suitable for highway and topographic surveys as well as cross-section measurements. In small-scale agricultural water conservancy projects, it can be used for site reconnaissance, preliminary surveys, and the measurement of terraced fields, land leveling, and small irrigation channels.
During observation, the hand level is typically held in the hand. To improve accuracy, it can also be placed at an appropriate height (e.g., 1.3 ~ 1.5 on a wooden frame or tied to a wooden pole.
Basic parameters:
Dial diameter: ∅ 60mm
Scale range: angle +600 ~ 00 ~ -600
Slope (450 ~ 0035 ′ ) 1:1 ~ 1:100
Dial graduation value: 1 0
Cursor grid value: 10 ′
Longitudinal level angle value: 20 ′ /2mm
Instrument dimensions: 130 x 56 x 29 (mm)
Total instrument weight: 250 Krypton
Instrument Structure
As shown in Figure 1 and Figure 2.
The mirror and its mount are housed within the square mirror tube, but this is not indicated in the figure.
Instrument Usage:
(1) Measure the elevation difference between two locations.
As shown in Figure 3.
When measuring A When the elevation difference between points B and C is h, the observer stands midway between the two points, holding a hand level (or placing it on a wooden stand), with the vernier indicator line aligned with the 0 mark on the graduated dial. 0 Align the leveling staff at station A with the sighting wire in the telescope, center the bubble level on the sighting wire, and read the backsight reading a.
The observer turns in place and, using the same method, aims at station B. the leveling staff, and read the foresight reading b.
Then A The elevation difference h between points B is:
h=a-b
If A is known If the elevation of point A is Ha, then the elevation of point B, Hb, is:
Hb = Ha + h
(2) Measure the angle of inclination (or slope) between two points.
As shown in Figure 4.
The observer is standing at A. Point B: erect a target pole. Mark an easy-to-aim reference on the pole.
obvious markers (such as red tape), and the height of the marker above the ground i Should be with the observer
Eyes at the same height. Hold the level in the left hand and use the sighting wire to aim at the flagpole marker, with the right hand...
Turn the handwheel to center the spirit bubble over the sighting wire. At this point, the vernier scale indicates...
The angle (or slope) is A. The slope (or gradient) between points B and C.
As shown in Figure 5, the reading is:
Angle: +26 040 ′
The slope is: 1:2
Instrument calibration:
(1) Verify using a leveling platform.
Establish a leveling platform using a long spirit level or a leveling instrument (with accuracy no lower than
5 ′ /2mm ).
1. Place the spirit level on the leveling platform, aligning the vernier indicator line with the 0 mark on the scale. 。
If the spirit bubble is not centered over the scale line, use the manual bubble adjustment screw to make the correction.
It is being centered. (The difference between the distances from both ends of the bubble to the刻线 must be less than 0.2 mm.) )
2. After centering the bubble, check whether the leveling bubble is centered relative to the sighting wire; if
If it is not centered, loosen the adjustment screws on the mirror mount and move the mirror mount back and forth to ensure that
It should be centered. (The deviation from center must be less than one-quarter of the bubble’s length.) Then secure it.
Adjustment screw for the fixed mirror mount.
(2) If a long level or leveling instrument is unavailable, the following simple method may be used for verification and adjustment.
As shown in Figure 6. As shown.
1. On a flat surface, select 20. —Two stationary targets at 30 meters
(such as trees, utility poles, walls, or leveling rods placed on a leveling staff rest).
First, at measurement point A. Mark a point at elevation a (the elevation at this point is slightly below the observer’s eye level), ensure the spirit bubble is centered, and then sight on point b on survey point B from position a, marking it as well. Next, move to point b on survey point B; with the bubble centered, sight back to survey point A. If the crosshairs are precisely aligned with point a, this indicates that the spirit level has been accurately set and no further adjustment is required.
For example, if not with a If the points do not coincide but instead one point C is slightly higher or lower, mark point C and then take the midpoint m of points a and c. At measurement point B, at position b, sight along the aiming wire to point m, and adjust the leveling bubble correction screw to center the leveling bubble on the scale line. Figure 6
Repeat the above verification and adjustment procedures until the difference between the distances from the bubble’s two ends to the scale is less than 0.2 mm. Until then.
2 After bubble centering and correction, place a wooden block in a basin of water. The block should have uniform texture, consistent thickness, and a flat surface; its top surface must be parallel to the horizontal plane, and the buoyant force should exceed 20. Use kilograms for measurement. Place the spirit level on the wooden block and check whether the bubble in the level is centered over the sighting wire. If it is not centered, loosen the adjustment screws of the reflecting mirror, then move the mirror mount back and forth to bring the bubble to center. (The allowable misalignment should be less than one-quarter of the bubble’s length.) Finally, tighten the adjustment screws of the mirror mount.
Repeat the above verification and adjustment procedures until the difference between the distances from the bubble’s two ends to the scale is less than 0.2 mm. Until then.
Harbin Optical Instruments Factory Co., Ltd.
HARBIN OPTICAL INSTRUMENT FACTORY LTD.
ground Address: Jingwei Third Road, Daoli District, Harbin City 32 Number
Post Editor: 150010
Electricity Words: 400-030-0319 0451-84286338
network Address: www.hrboptical.com
E-mail： hopt@hopt.cn
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