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12.4 Error when no atmospheric correction is made
When measurement is carried out with no atmospheric correction (with the settings fixed at a
temperature of 15° C and an atmospheric pressure of 1013hPa or 760mmHg), the error per 100
meters in temperature and pressure will be shown in the tables below.
• When the actual pressure is 1013hPa (760mmHg) and the temperature is 25° C, conducting
the measurement with the temperature left at 15° C will result in the measurement being
short by 0.9mm per 100 meters.
[Error table: When hPa (15° C, 1013hPa as standard)]
hPa
1200
C°
45
2.0
35
3.0
25
4.0
15
5.2
5
6.3
-5
7.6
-15
9.0
[Error table: With mmHg (15° C, 760mmHg as standard)]
mmHg
C°
45
35
25
15
5
-5
-15
60
1100
1013
-0.5
-2.6
0.4
-1.8
1.4
-0.9
2.4
-0.0
3.5
1.0
4.7
2.1
5.9
3.2
900
800
760
2.0
-1.3
-2.6
3.0
-0.4
-1.8
4.0
0.5
-0.9
5.2
1.5
0.0
6.3
2.5
1.0
7.6
3.7
2.1
9.0
4.9
3.2
900
800
700
-5.5
-8.0
-10.5
-4.7
-7.3
-9.9
-4.0
-6.6
-9.3
-3.1
-5.9
-8.6
-2.2
-5.1
-8.0
-1.3
-4.2
-7.2
-0.2
-3.3
-6.4
700
600
-4.6
-8.0
-3.9
-7.3
-3.1
-6.6
-2.2
-5.9
-1.3
-5.1
-0.3
-4.2
0.8
-3.3
Unit:mm
600
500
-13.0
-15.5
-12.5
-15.1
-12.0
-14.6
-11.4
-14.2
-10.8
-13.7
-10.2
-13.1
-9.5
-12.6
Unit:mm
500
400
-11.3
-14.6
-10.8
-14.2
-10.2
-13.7
-9.6
-13.3
-8.9
-12.7
-8.2
-12.2
-7.4
-11.5
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