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25. CHANGING THE SETTINGS
120
$
• The screen will be displayed only when "Illum. hold " is set to "Guide" and the
cursor is on "Guide".
Item set and option (*: Factory setting)
&
Atmospheric correction factor
The SET measures the distance with a beam of light, but the velocity of this
light varies according to the index of refraction of light in the atmosphere.
This index of refraction varies according to the temperature and air
pressure.
• To precisely determine the atmospheric correction factor, the average
temperature and air pressure along the measurement beam route must be
taken. Take care when calculating the correction factor in mountainous
terrain as the difference in height will result in differences in atmospheric
conditions between two points.
• The SET is designed so that the correction factor is 0 ppm at an air pressure
of 1013 hPa and a temperature of 15°C.
• By inputting the temperature and air pressure values, the atmospheric
correction value is calculated and set into the memory. Calculate the
atmospheric correction factor as shown in the following formula.
C
"34.2 Atomospheric Correction for High Precision Distance
Measurement"
• If the weather correction is not required, set the ppm value to 0.
The Guide light (Brightness
level of the guide light)
1 to 3 (3*)
ppm = 282.59 -
0.2942 x air pressure (hPa)
1 + 0.003661 x air temperature (°C)
Illum.hold:
Guide
Guide light: 3
X130R.book 120 ページ 2003年10月8日 水曜日 午後12時53分
Содержание 130R Series
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Страница 182: ...2nd ed 04 0409 Printed in Japan 2003 SOKKIA CO LTD X130R_C3C4 fm 2 ページ 2004年9月21日 火曜日 午前10時49分 ...