How to use a level
Steps for using the level: Install the level and correct the level. Aim the water gauge, adjust the horizontal wire to coincide with the reading line, and take the reading. Take backsight and forwardsight readings. Calculate the height difference according to the formula. Pay attention to keeping the instrument level, choosing a clear water gauge, taking necessary protective measures and calibrating the instrument regularly.
How to use the level
The level is a measuring instrument widely used to measure horizontal height differences. It has the characteristics of high precision and easy operation. The following is how to use a level for measurement:
1. Instrument installation
- Stabilize and level the tripod bracket of the level.
- Fix the level to the tripod and tighten the set screw securely.
2. Instrument calibration
- Coarsely adjust the level of the level by adjusting the legs of the tripod.
- Check the built-in horizontal tube of the level and adjust it to the center position for fine adjustment.
3. Aiming reading
- Align the water gauge through the eyepiece so that the reading line on the water gauge is clearly visible.
- Rotate the slight tilt screw so that the horizontal wire on the water gauge coincides with the reading line.
- Record readings.
4. Back-sight readings and forward-sight readings
- Back-sight readings:After the instrument is installed, first align it Take the water gauge reading from the base point water gauge with known elevation.
- Front sight reading: Move the instrument to the point where the height is to be measured, and align it with the water gauge reading at that point.
5. Calculate the height difference
-
Calculate the height difference according to the formula:
<code>高差 = 后视读数 - 前视读数 + 仪器高</code>
Where: the height of the instrument is Refers to the visual height of the instrument, usually marked on the instrument.
6. Precautions
- Ensure that the instrument is level to avoid errors.
- Choose a water gauge that is clear and easy to read.
- Take shelter or other protective measures when exposed to direct sunlight or windy weather.
- Calibrate the level regularly to ensure measurement accuracy.
The above is the detailed content of How to use a level. For more information, please follow other related articles on the PHP Chinese website!
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