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Instruction Manual for the SSY-1 Handheld Level
Release Date:
2021-06-22
The SSY-1 handheld level (hereafter referred to as the “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. The instrument is lightweight and compact, making it extremely convenient for field measurements and portability. 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 ~ It is carried out on a wooden frame 1.5 meters high or tied to a wooden pole.
Basic parameters:
Dial diameter: ∅ 60 mm
Scale range: angle +60 0 ~ 00 ~ -60 0
Slope ( 450 ~ 0035 ′ ) 1:1 ~ 1:100
Dial graduation value: 10
Cursor grid value: 10 ′
Longitudinal level angle value :20 ′ /2mm
Instrument dimensions: 130x56x29 （ mm )
Total instrument weight: 250 grams
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:
- Measure the elevation difference between two locations.
As shown in Figure 3.
When measuring When the elevation difference between points A and B 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 , aim at the station using the in-tube sighting wire. Place A’s leveling staff and center the bubble in the level vial over the sighting wire, then read the backsight reading a.
The observer turns in place and, using the same method, aims at the survey station. Read the foresight reading b on B’s leveling rod.
then The elevation difference h between points A and B is:
h=a-b
If it is known If the elevation at point A is Ha, then the elevation at point B, Hb, is:
Hb = Ha + h
(2) Measuring the inclination angle (or slope) between two points
As shown in Figure 4.
The observer is standing Set up flagpoles at Point A and Point B. Mark easy-to-aim targets on the flagpoles.
Obvious markers (such as red tape), and the height of the markers 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 The slope (or gradient) between points A and B.
As shown in Figure 5, the reading is:
The angle is: +26 040 ′
The slope is: 1:2
Instrument calibration:
(1) Verification using a leveling platform
Establish a leveling platform using a long level or a leveling instrument (with accuracy no lower than
5 ′ /2 mm).
- Place the spirit level on the leveling platform, aligning the vernier indicator line with the scale dial. 0.
If the spirit bubble is not centered over the scale line, use the manual bubble adjustment screw to make the correction.
is centering it. (The requirement is that the difference between the distances from the two ends of the bubble to the刻线 must be less than 0.2 mm)
- 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.
If a long level or leveling instrument is unavailable, the following simple method may be used. Inspect school
As shown in the figure. As shown in Figure 6 。
- On a flat surface, select Two fixed targets at 20–30 meters
(such as trees, utility poles, walls, or leveling rods placed on a leveling staff rest).
First, at the measurement point. Mark a point at elevation a (the elevation of this point being slightly below the observer’s eye level), ensure the spirit bubble is centered, and then sight along the leveling rod to a point b on benchmark B, marking it as well. Next, proceed to point b on benchmark B; with the bubble centered, sight back to benchmark A. If the crosshairs are precisely aligned with point a, this indicates that the spirit bubble has been properly leveled and no further adjustment is required.
For example For example Not with Instead of point a coinciding, if it is slightly higher or lower at point C, make a mark at C and take a. 、 The midpoint m of points c. At survey station B, at point b, observe so that the sighting wire is aligned with point m; then adjust the leveling bubble correction screw to center the leveling bubble within the scale. Figure 6
Repeat the above method. Inspect The calibration is performed until the difference between the distances from the bubble’s two ends to the scale is less than Up to 0.2 mm.
2. After centering and correcting the bubble, place a wooden block in a water basin. The block should have a uniform texture, consistent thickness, and a flat surface; its top surface must be parallel to the horizontal plane, and its buoyant force should exceed 20 kilograms. Place the hand level on the wooden block and check whether the leveling bubble is centered relative to 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 into center. (The allowable misalignment must be less than one-quarter of the bubble’s length.) Finally, tighten the adjustment screws of the mirror mount.
Repeat the above method. Inspect The calibration is performed until the difference between the distances from the bubble’s two ends to the scale is less than Up to 0.2 mm.
Harbin Optical Instruments Factory Co., Ltd.
HARBIN OPTICAL INSTRUMENT FACTORY LTD.
earth 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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