11 SETTING ATMOSPHERIC CORRECTION

11 SETTING ATMOSPHERIC CORRECTION

The velocity of light through air is not constant and depends on the atmospheric temperature and pressure. The atmospheric correction system of this instrument corrects automatically when the correction value is set. 15°C/59°F, and 1013.25hPa / 760mmHg / 29.9 inHg is as a standard value for 0ppm in this instrument. The values are kept in the memory even after power is OFF.

lSetting the atmospheric correction value is in the STAR key ( H) mode.

11.1 Calculation of Atmospheric Correction

The followings are the correction formulas. Unit; meter

 

79.535-------------------------⋅P

⋅ 10–6

Ka =

279.67 –

 

273.15 + t

 

Ka: Atmospheric correction value

P: Ambient atmospheric pressure (hPa)

t: Ambient Atmospheric temperature (°C)

The distance L (m) after atmospheric correction is obtained as follow.

L = l (1+Ka)l :Measured distance when atmospheric correction is not set.

Example : In case Temperature +20°C, Air pressure 847hPa, l =1000 m

 

 

Ka =

279.67 –

79.535------------------------------⋅847-

 ⋅ 10–6

 

273.15 + 20

+ 50⋅10-6(50 ppm)

L= 1000 (1+50⋅10-6) = 1000.050 m

11.2Setting of Atmospheric Correction Value

lHow to Set Temperature and Pressure Value Directly

Measure the temperature and air pressure surrounding the instrument beforehand.

Example : Temperature: +26°C, Pressure:1020 hPa

Operating procedure

Operation

Display

1 Press STAR (H) key.

[H]

 

 

Press the [F6] key twice to get the page three.

2003-10-10 14:30:40

 

[F6] twice

 

 

 

 

3↓

2 Press the [F2] key.

[F2]

 

 

 

 

 

 

Current setting value is displayed.

 

 

 

 

 

20.0 °C

5.1ppm

 

 

 

 

 

 

 

 

 

 

 

1012.0hPa

-2.0 mm

 

 

 

 

 

 

 

 

3 Input Temp.value and press [ENT] key.

Enter

 

 

Temperature setting

 

 

 

 

 

 

 

 

 

 

[Example] Temp. : +26°C

value

 

 

 

 

26.0 °C

5.1ppm

The cursor moves to Pressure setting

 

 

 

 

 

 

 

 

 

 

 

automatically

[ENT]

 

 

 

 

1012.0hPa

-2.0 mm

 

 

 

 

4 Input Pressure value, and press [ENT].

Enter

 

 

Pressure setting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

26.0 °C

5.1ppm

[Example] Pres. :1020.0hPa.

 

 

 

 

value

 

 

 

 

The display returns previous mode.

 

 

 

 

 

 

 

 

 

 

 

1020.0hPa

-2.0 mm

*1) *2)

[ENT]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11-1

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Topcon GTS-822A, GTS-825A, GTS-823A instruction manual Setting Atmospheric Correction, Calculation of Atmospheric Correction
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