Spesification
The main specifications of the AE-7
Magnification: 30x, Effective diameter of objective lens: 40 mm, Minimum
focusing distance: 20 cm, Auto-compensation range: about 0.5 degrees
(±about 0.25 degrees), Standard deviation per 1-km double-run leveling:
±1.5 mm, Dimensions: 220 mm x 136 mm x 142 mm, Weight: 1.7 kg
The photograph shows an AE-7C with a horizontal scale.
* Standard deviation per 1-km double-run leveling: instrument error when
outward and return measurements of the difference in elevation between
two points with 1 kilometer distance are conducted.
A surveying instrument is an instrument for measuring the positional
relationship between two points on a terrain. An instrument that
measures differences in elevation (a leveling instrument) is known as a
“level,” while an instrument that measures horizontal and vertical
angles (an angular-measurement instrument) is known as a “theodolite.”
An enhanced version of the theodolite is the “total station,” which can
measure angles and distance.
A level consists of a telescope for looking at a leveling rod, which
is a kind of ruler, and a pedestal for rotating the telescope
horizontally. When the difference in elevation between points A and B is
measured, as shown in the diagram, the method for using the level to
perform the measurement is as follows:
- The level is positioned between points A and B.
- The level is used to take a reading from the scale on the leveling
rod at point A. This reading is designated as the value a and is
referred to as the “backsight.”
- The level is pointed at the leveling rod at point B, and a reading
is taken from its scale. This reading is designated as the value b and
is referred to as the “foresight.”
- The value b is subtracted from the value a to obtain the difference in elevation between points A and B.
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