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12 SETTING ATMOSPHERIC CORRECTION
12-1
12 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.
12.1 Calculation of Atmospheric Correction
The followings are the correction formulas. Unit; meter
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
+ 50×10
-6
(50 ppm)
L = 1000 (1+50×10
-6
) = 1000.050 m
12.2 Setting of Atmospheric Correction Value
● How to Set Temperature and Pressure Value Directly
Measure the temperature and air pressure surrounding the instrument beforehand.
Example : Temperature: +26°C, Pressure:1017 hPa
Operating procedure Operation Display
1 Press the [F4] key to get the soft key page 2 in the
distance measurement mode or page 3 in the
coordinate measurement.
[F4]
2 Press the [F3](S/A) key to set Set Audio Mode
from distance or coordinate measurement mode.
[F3]
3 Press the [F3](T-P) key.
[F3]
4 Input Temp.value and Pressure value.*1)
Mode returns to Set Audio mode.
Enter Temp.
Enter Pres.
*1) Refer to Section 2.6 “How to Enter Alphanumeric characters”.
● Range : Temp. –30 to +60°C (0.1°C step) or –22 to +140°F (0.1°F step)
Pres. 560 to 1066.0hPa (0.1hPa step) ,420 to 800mmHg (0.1mmHg step) or
16.5 to 31.5inHg (0.1inHg step)
Ka: Atmospheric correction value
P : Ambient atmospheric pressure (hPa)
t : Ambient Atmospheric temperature (°C)
Ka
278.88
79.307
P
×
273.15
t
+
-------------------------------–
10
6
–
×
=
Ka
278.88
79.307 847
×
273.15 20
+
----------------------------------------–
10
6
–
×
=
HR: 120°30'40"
HD* 123.456 m
VD: 5.678 m
MEAS MODE NP/P P1
↓
OFSET S.O S/A P2
↓
SET AUDIO MODE
PSM:0.0 PPM 0.0
SIGNAL:[❙ ❙ ❙ ❙ ❙]
PRISM PPM T-P –––
TEMP. & PRES. SET
TEMP.
→
15.0 °C
PRES. : 1013.2 hPa
INPUT ––– ––– ENTER
TEMP. & PRES. SET
TEMP. : 26.0 °C
PRES. : 1017.0 hPa
INPUT ––– ––– ENTER
- GPT-2000 1
- FOREWORD 3
- AVO ID EXPOSURE 7
- LASER LIGHT IS EMITTED 7
- FROM THIS APERTURE 7
- Contents 8
- Standard Set Composition 11
- 1 NOMENCLATURE AND FUNCTIONS 12
- 1.2 Display 14
- Keys Name of Key Function 15
- Angle measurement 16
- Distance measurement mode 16
- Coordinate measurement mode 16
- Mode Output 17
- N, E, Z, HR (or V,H,SD,N,E,Z) 17
- 2 PREPARATION FOR MEASUREMENT 18
- 2.3 Power Switch Key ON 20
- V : 90°10'20" 21
- HR: 0°00'00" 21
- 0SET HOLD HSET P1 21
- Turning the Point Guide OFF: 25
- Symbol mark 26
- 3 ANGLE MEASUREMENT 27
- Display angle 28
- 4 DISTANCE MEASUREMENT 33
- 4.4 Distance Measurement 35
- 4.6 Stake Out (S.O) 37
- 4.7 Offset Measurement 38
- 5 COORDINATE MEASUREMENT 47
- Enter Inst.HT 48
- Enter R. HT 48
- Set direction 49
- 6 SPECIAL MODE (Menu Mode) 50
- Collimate 55
- 6.2 Setting the GRID FACTOR 65
- 6.4 Setting Mode 1 67
- 7DATA COLLECTION 71
- 7.1 Preparation 73
- ● Distance offset measurement 80
- ● Column offset measurement 80
- Collimate A 81
- 7.4 NEZ Auto Calculation 87
- Menu Selecting Item Contents 89
- 8LAYOUT 90
- 8.1 Preparation 92
- Grid Factor 92
- Enter coord 95
- 8.2 Executing a Layout 98
- 8.3 Setting a New Point 100
- 9 MEMORY MANAGER MODE 106
- 9.2 Searching Data 108
- 9.3 FILE MAINTENANCE 112
- Enter COORD 115
- 9.6 Editing PCODE Library 117
- 9.7 Data Communications 118
- Item Selecting Item Contents 120
- 9.8 Initialization 121
- 10 SET AUDIO MODE 122
- Enter Temp 124
- CURVATURE 129
- 14 POWER SOURCE AND CHARGING 130
- 15 DETACH/ATTACH OF TRIBRACH 132
- 16 SELECTING MODE 133
- US SURVEY / 133
- INTERNATIONAL 133
- DISTANCE MEAS 133
- LANGUAGE * ENGLISH/ 134
- 17 CHECK AND ADJUSTMENT 137
- Measuring point 145
- POWER ON 147
- , and 3) 149
- 18 PRECAUTIONS 150
- 19 SPECIAL ACCESSORIES 151
- 19 SPECIAL ACCESSORIES 153
- 20 BATTERY SYSTEM 154
- 21 PRISM SYSTEM 155
- Single prism 155
- Tilting triple 155
- 22 ERROR DISPLAYS 156
- Error code 156
- 23 SPECIFICATIONS 158
- APPENDIX 161
- APPENDIX-2 162
- APPENDIX-3 163
- APPENDIX-4 164
- APPENDIX-5 165
- GPT-2000 series 168
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