AccuLine 40-6926 사용 설명서 - 페이지 7

{카테고리_이름} AccuLine 40-6926에 대한 사용 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. AccuLine 40-6926 12 페이지. 26x automatic level

1316H-English

7/10/08

9:45 AM

Page 7

5.3 Line-of-Sight

The line-of-sight needs to be horizontal within 3mm of level to be accurate.

Set up and level the instrument on a tripod midway between two

leveling rods set approximately 100 ft. to 160 ft. (30m to 50m) apart.

Sight rods A and B; the height readings are a1 and b1 (Fig. 7). The

value "H" is equal to (a1 - b1). Move the instrument to within 6 ft. (2m)

of rod A and re-level. Again sight rods A and B; these height readings

are a2 and b2 (Fig. 8).

Fig. 7

Fig. 8

If a1 - b1 = a2 - b2 = H, the line-of sight is horizontal. If not, the level

should be adjusted as follows.

Because the instrument is set halfway between A and B, any error in the

line-of-sight causes both readings to be erroneous by the same amount.

Error e cancels out, so the value a1 - b1 = H is correct. Therefore,

a2 - H = b3, the adjusting value.

Fig. 9

To adjust, unscrew the eyepiece cover.

Turn the adjusting screw with the

adjusting pin (Fig. 9) until the horizontal

cross hair gives the reading b3 on rod B.

Repeat the above procedure until

{(a1 - b1) - (a2 - b2)}

≤

3mm.